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Biographical Memoirs: Volume 72 JAMES GORDON HORSFALL January 9, 1905–March 22, 1995 BY PAUL E. WAGGONER JAMES GORDON HORSFALL, who called himself a squirt gun botanist, fought the ''rusts and rots that rob us, the blasts and the blights that beset us."1 His writing inspired plant pathologists. He raised the quota of fundamental research in agriculture and the quota of agriculture in fundamental research. CHILDHOOD Horsfall was born January 9, 1905, in Mountain Grove, Missouri, where his father Frank, poor as a church mouse, worked at a tiny independent fruit experiment station. He grew up in Monticello, Arkansas, where his father presided over an agricultural school. His mother was Margaret Vaulx Horsfall. The strength of the father's example was demonstrated by three sons who became a plant pathologist, an entomologist, and an horticulturist. Horsfall, claiming the essential ingredient of a scientist was nonconformity, traced his own nonconformity to a grandfather sent to shoot birds along the Mississippi river by a well-to-do English great-grandfather. Horsfall entitled his autobiography "The Story of a Nonconformist."2 Although he would spend most of his life in the northeast, Horsfall never forgot his agricultural roots; he featured his country connections, and when

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Biographical Memoirs: Volume 72 he died at ninety, his will sent his library to the experiment station back home in Mountain Grove. A pear tree afflicted by fire blight introduced young Horsfall to plant pathology, and he followed the advice to prune it. The stump left after a few years of Draconian treatment encouraged his disrespect for conventional wisdom. Father sent him to the University of Arkansas in 1921 well enough prepared to skip his freshman year.3 COLLEGE At the university Horsfall's luck continued. The fun of tinkering with Model T's had inclined him to engineering but math disinclined him. The luck was falling under the influence of Dwight Isely, an entomologist who loved science and stimulated Horsfall to love it, too. Pinning Chrysomelids into boxes for an insect collection bored Horsfall, and he later inveighed against "stamp collecting science." Riding a horse through cotton fields was more exciting. Pioneering the use of insect counts to schedule dusting for boll weevils, Isely employed Horsfall for two summers to scout the fields near Marianna, Arkansas, for signs of the weevil. His rewards of horseback riding, summer employment, and science practiced outdoors were augmented forty-eight years later when he heard from the stage of the National Academy of Sciences that he was the first scout of integrated pest management. Horsfall claimed his nonconformity kept him from getting a graduate scholarship in entomology. The head entomologist at Arkansas had taken a dislike to him that Horsfall blamed on himself. Fortunately, however, plant pathologists H. R. Rosen and V. H. Young of Cornell found him a place and set him upon the road of the fungi. By the time he was granted a Ph.D. in 1929 he had traveled far with other

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Biographical Memoirs: Volume 72 students of H. H. Whetzel's Principles of Plant Disease Control.4 In 1927 Horsfall married Sue Belle Overton. Their children are Margaret Eleanor Horsfall Schadler and Anne Vaulx Horsfall Thomas.5 Near the end of his life Horsfall wrote of two great blunders. One was irritating the entomologist at Arkansas and the other was a remark that brought down the wrath of the head pathologist at Cornell. "Being a competitive character, my personality was pretty abrasive as a child and young man. It got me into several pecks of trouble until my wife about 1933 persuaded me that you capture more flies with honey than with vinegar," he wrote in his eighties. Sue Belle Overton redirected Horsfall's nonconformity from breaking his knuckles to breaking ground in research.6 FUNGICIDES Luckily, the Agricultural Experiment Station in Geneva, New York, gave newly graduated Horsfall a job as assistant professor in February 1929, safely before the stock market crash in October. Although the economics of 1929 may have damped his nonconformity and heightened his appreciation of the practical, he gave much credit to two greenhouse growers. They first flattered the twenty-four-year-old scientist by calling him "doctor" and then asked, "Can you soak tomato seeds in a copper sulfate solution and control damping off?" Obligingly, if insecurely, he answered, ''I think so." To test his opinion he proceeded to experiment. Decades later he still recalled how the thrill from the success of the first experiment caught his mind. When he reported his success at a national meeting, the presence of the eminent L. R. Jones in the front row endorsed the thought caught in his mind.7 Forever after he would label himself a squirt gun botanist.

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Biographical Memoirs: Volume 72 In later years when administration palled, he would tell his secretary he was going to have "fun with fungicides" and slip away to his lab. 8 Believing profoundly that institutions were the lengthened shadows of great men, Horsfall studied them. He found the man on the front row, L. R. Jones, "carried water on both shoulders." Jones could carry theoretical epidemiology on one shoulder and cabbage breeding on the other. Vowing to emulate Jones, Horsfall found theory in something as banal as damping off. He would do both theoretical and applied research and on crops and diseases that mattered to his state.9 Later he joined in writing, "Our philosophy is to dig new knowledge from the face of the mine and convert it to fuel to power the society that pays for our groceries."10 Since P.-M.-A. Millardet in 1882 discovered that a mixture of lime and copper sulfate applied to grapes in the Medoc to discourage pilfering also discouraged downy mildew, Bordeaux mixture had been the elixir of plant pathology.11 Deposited on leaves, it killed mildew spores when they alighted. Conforming, the new pathologist Horsfall began spraying canning tomatoes with Bordeaux, and although the dry weather of the 1930s discouraged disease and he had little disease to observe, he persisted. His genius, which he would have called nonconformity, was turning the lack of disease into opportunity. In the absence of mildew and thus the benefit of its control by spray, he could see that Bordeaux harmed the tomatoes. Remembering his vow to combine fundamental with applied, he delved into the harm. He found that the spray of Bordeaux closed the leaf pores that admit carbon dioxide, the raw material for photosynthesis. The alkaline spray also weakened the cuticle around

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Biographical Memoirs: Volume 72 the pores, hardened the lamella within the leaves and stunted the tomato plants.12 Bordeaux was applied to far more acres of potatoes than tomatoes, and the motto was, "Spare the Bordeaux and spoil the potatoes." Horsfall could not believe that the spray stimulated potatoes but harmed closely related tomatoes. He believed the benefits of disease control, and also insect control by Bordeaux, simply hid the harm of Bordeaux to potatoes. He would find sprays that controlled the pests without harming the potatoes. Attributing the harm to the alkalinity of the Bordeaux mixture, Horsfall tried copper oxide, but since it did not control insects as the mixture of copper sulfate and lime did, it could not succeed. Because the only chemical controls of plant disease had been sulfur, copper, and Bordeaux mixture for over a century, he was temporarily at a loss. Nevertheless, in the mid-1940s he risked excommunication by telling attendees at an inspection of fungicide trials that Bordeaux mixture on potato was a dead horse that had not yet fallen over.13 Despite the near excommunication Horsfall enthused in his 1945 book, "The story of organic sulfur compounds is being unfolded so rapidly that any discussion of them can hope only for a 'stop-action' snap-shot." Sulfur "wonder drugs" were in the public eye and Horsfall claimed, "Farmers are flooding the market with calls for the new 'thio' fungicides." 14 A book reviewer, however, wrote that not all would agree that Bordeaux mixture and elemental sulfurs would be turned out to pasture to spend their last years in leisure for a job well done. Thirty years later seventy-year-old Horsfall agreed that he had been an ebullient nonconformist.15 Fortunately, in 1945 at age forty he was unabashed. A few years earlier he had an experience on the road to Damascus. An ear infection that had endangered his small daughter

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Biographical Memoirs: Volume 72 was miraculously healed by a new synthetic organic compound called sulfanilamide. Undaunted by colleagues' claims that farmers would not pay $1.50 per pound for organic compounds when Bordeaux sold for 6¢, he soldiered on.16 A Horsfall maxim was, "Relate the unrelated."17 Thus, he saw a similarity of sulfur in fungicidal action and in rubber vulcanization, of all things. With the help of W. C. O'Kane of the Crop Protection Institute he began collaborating with United States Rubber Company (now Uniroyal). Horsfall and his colleagues cited the dogma that copper in Bordeaux killed by oxidizing. United States Rubber replied that copper oxidizes rubber, too. So, why not try an organic pro-oxidant such as tetrachloroquinone? Accordingly, in 1938 Horsfall and colleagues treated pea seeds with it, buried the seeds, and discovered the protection imparted by what would be Spergon.18 A sidelight illuminated the always complicated marriage of academe and industry. Horsfall never published the results because United States Rubber would not release the chemistry, and he would not publish without it. Practicality overcame, however, and E. G. Sharvelle, then in Horsfall's lab, and H. S. Cunningham published the results under a code number. Farmers in New York State were soon buying Spergon, proving they would pay $1.50 a pound to protect pea seed.19 When the chemical that protected seed was sprayed on foliage in competition with Bordeaux, however, it failed. Sun and dew caused it to hydrolyze. Although related quinones did not deteriorate and found commercial application, they did not find it on potatoes.20 In 1939 Director W. L. Slate of the Connecticut Agricultural Experiment Station persuaded Horsfall to move to New Haven to succeed G. P. Clinton (and before him Roland Thaxter) as chief of the Department of Plant Pathology

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Biographical Memoirs: Volume 72 and Botany. Although both predecessors had been distinguished, Horsfall mainly enjoyed quoting Thaxter, demonstrating his own lively writing, and exposing Thaxter's acidic wit.21 He found a comfortable home at America's first agricultural experiment station, whose founder believed, "Theory and practice must march together."22 In the same year Horsfall sat in a cheap restaurant outside Grand Central Station talking with his friend D. F. Murphy of Rohm and Haas Company about their cooperative work on cuprous oxide. Perhaps because he had changed addresses Horsfall felt it was time for other changes. He said to Murphy, "Let us try to develop organic fungicides. Sulfur is a fungicide. Let us try organic sulfur compounds." Obligingly, Rohm and Haas sent 100 samples in January 1940. One was He-175, later labeled D-14. A. E. Dimond and J. W. Heuberger with Horsfall found D-14 was water soluble and so spread an invisible film evenly over leaves. When it dried, however, it became insoluble and, hence, resistant to removal by rain. It had a peculiar dosage-response curve, it controlled several diseases, and its invisible film recommended it to the eye.23 D-14 is ethylenebisdithiocarbamate or nabam. Soon, modifications of nabam (i.e., zinc and manganese ethylenebisdithiocarbamate) by Heuberger, D. O. Wolfenbarger, R. W. Barratt, and Horsfall completed the invention of successful controls of a range of diseases. Although the control of potato and tomato late blight by nabam had at first disappointed, the alterations of solubility by zinc and manganese saved nabam from almost certain failure, and Horsfall could later write, "A potato fungicide was born, and Bordeaux was in trouble." 24 About forty years later the National Research Council reported about the family of ethylenebisdithiocarbamates (EBDCs): There are over 40 manufacturers world wide … EBDCs are the

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Biographical Memoirs: Volume 72 most widely used group of fungicides in the world. The global market was estimated at $525 million in 1984. In the United States, more than 30 million pounds are used annually to control a wide variety of fungal diseases … Approximately one-third of all fruits and vegetables in the United States are treated with EBDCs.25 BORDEAUX MIXTURE DIED AND FELL OVER Fungicides that lie in wait on leaves cannot control fungi like the Dutch elm disease pathogen, that an insect injects into the host. When Horsfall arrived in New Haven, the disease was decimating the trees that had given it the name Elm City. Joined by G. A. Zentmyer and A. E. Dimond, he tried chemotherapy, putting the fungicide into the water-conducting vessels of the elm where the pathogen lived. Rarely had systemic fungicides been tried, and it took a nonconformist to imagine he could save a tall elm. Undaunted, the team filled Cremo Ale cans with candidate elixirs and injected the fluid into the vessels inside the trunks by connecting ale cans to trunks with rubber tubes. 26 The campaign to save the elms failed. Although trees alive were kept alive, they died as soon as treatment stopped. Horsfall attributed the failure to degradation of the compounds in the tree plus the lack in plants of the analog of phagocytes to clean up survivors. A consolation to the campaigners was Ainsworth's statement in a history of plant pathology that their unsuccessful attempts to control elm diseases by chemotherapy provided a stimulating example to others. In 1968 others finally discovered a successful systemic fungicide, benomyl.27 EXPERIMENTER Horsfall believed in saving energy by using other people's data to draw new conclusions and applauded the plant pathologist

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Biographical Memoirs: Volume 72 who boasted none of his books had any experimental data of his own collecting.28 Horsfall's generalizations could leave the listener awestruck. When a critic observed, "He leaps from crag to crag with the nimbleness of a mountain goat," Horsfall liked that.29 Nevertheless, he was a shrewd experimenter. To anticipate fungicidal success in the field he designed an apparatus for uniform deposit of fungicides on a glass slide and measurement of their action on spores.30 His 1945 book, which found its way into several languages, featured dosage-response curves on logarithmic-probability coordinates for exploring the laboratory results. In an era dominated by randomized blocks and Latin squares of treatments in the field, he cleverly tested fungicides on spiral rows: "The hand-carried spray boom is flexible, the power pump untiring; the circular route of travel saves a return empty trip; and the water supply and drainage arrangements save work and time in loading."31 EPIDEMIOLOGY His preeminence in fungicides could obscure Horsfall's contributions to epidemiology. In 1932 he coined the term "inoculum potential" to convey the idea of mass action—the greater the mass or virulence of the pathogen present, the more severe the disease regardless of environment. During the decades since, the precise meaning of inoculum potential has been smudged, with environment sometimes included and sometimes not. Through it all, however, Horsfall's graphic phrase on the banal dusting of tomato seed continues to convey the notion that an abundant supply of fungus can overwhelm a partially effective control.32 Determining the effectiveness of a fungicide brought Horsfall to the crux of epidemiology: How much disease is there? Measuring the changing quantity of disease in a crop

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Biographical Memoirs: Volume 72 of countless leaves requires a balancing of efficiency and accuracy. Without efficiency, the disease will out-race its measurement. Without accuracy, differences cannot be discovered. By 1942 Horsfall found that visually lumping plants into four equal grades of 25% each served fairly well.33 By inverting the issue from one of seeing disease to one of what disease could be seen, however, Horsfall improved estimation.34 "We stumbled onto two principles: (1) that the human eye is a photocell that reads in logarithms according to the Weber-Fechner law of human acuity and (2) that the eye reads the amount of diseased tissue below 50% and the amount of healthy tissue above 50%."35 Decades later, fearing pathologists were spending too much time on minutiae while neglecting larger matters, Horsfall wrote, "Many pad around in air-conditioned laboratories seeking the third decimal place in disease physiology. Very few tackle the blue-jean job of searching for accuracy in disease appraisal. Suppose for a few years now we give triple credit toward promotion for the disease appraisers."36 And another decade later, the Horsfall-Barratt grading system was still alive and a citation classic.37 The epidemic being assessed marches through a population of plants, integrating many factors in the environment and characteristics of the pathogen and host. This fabulous array boggles the mind. The arrival of fast computers, therefore, invited the integration of experimental evidence about the components of epidemics with mathematical simulators. They invited computation to reveal the controllable steps and also forecast epidemics. Accordingly, Horsfall participated in the review of knowledge of the life cycle and environmental influences on a tomato blight, experimented to fill in gaps, and assembled the first mathematical simulator of a plant disease. Histories of past weather and disease had been converted into statistical rules for forecasting disease,

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Biographical Memoirs: Volume 72 a member. His two brothers were scientists, too, and he wrote, "As a child, sibling rivalry played a role, I am sure."57 He welcomed the honor of membership as he later welcomed other awards of distinction, perhaps in a continuing competition. Mostly, however, he welcomed the election as a route to affecting scientific policy. He believed a scientist should "carry water on both shoulders" because in President John F. Kennedy's words to the Academy, "Scientists alone can establish the objectives of their research, but society, in extending support to science, must take account of its own needs."58 During the 1950s and 1960s Horsfall served on committees of the Atomic Energy Commission and National Aeronautics and Space Administration, the President's Science Advisory Committee, and the National Advisory Commission on Food and Fiber. He served on the Academy's Latin-America Science Board, and he led its Board on Agriculture and lobbied for a commission on agriculture and renewable resources.59 Discerning an excessive emphasis on application during his early years as a scientific statesman, he urged more basic research. Later, however, he perceived a growing separation of science and application, which violated the maxim that theory and practice must march together. He made his case in an unforgettable essay, "Relevance: Are we smart outside?"60 He related the parable of the little boy who was asked why he couldn't do as well in school as Alice. The boy answered, "Mother, Alice may be smart in school, but she is awfully dumb outside." To a scientist, who in 1932 searched out distinguished biochemist Z. I. Kertesz to join in studying "some effects of root-rot on the physiology of peas,"61 basic research was holy. But four decades later he worried about irrelevance, deplored grantsmanship, and wrote, ''Basic research at the old stand will no longer sell."

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Biographical Memoirs: Volume 72 He urged his colleagues to fire up their relevancy, raise their quota of field research toward 50%, and give credit for publication of practical results. As good as his word, Horsfall led committees at the Academy in two relevant inquiries. In 1970 an epidemic swept over the corn crop of the United States, threatening a great resource. In some sense, science and the technology of plant breeding were responsible because their success had caused genetic homogeneity of the crop. "In that it is the responsibility of the Agricultural Board [of the Academy] to watch for perturbations in the nation's agriculture and to suggest means by which to reduce them, the board established a committee to examine the blight epidemic." Horsfall led the committee of plant breeders, pathologists, entomologists, economists, and people knowledgeable in major crops to investigate the circumstances and also the more general issue of genetic vulnerability.62 When his colleague C. R. Frink called his attention to a slower rise of farm efficiency in the 1960s than in the previous decade, Horsfall encouraged the Rockefeller Foundation to fund a commission on agriculture and renewable resources of the Academy to perform an investigation of the nation's agricultural production efficiency. While Horsfall was leading the investigation, both food prices and exports soared, showing his prescience in anticipating the need of a nation that had been basking in sunny surpluses. Nevertheless, the report concluded optimistically that breakthroughs in cell fusion, photosynthesis, and biological nitrogen transformations could restore abundance. After the tally of basic breakthroughs hoped for, the last phrase of the report showed Horsfall's hand: "Being ever mindful of the need to seek practical field applications of major advances in knowledge." 63

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Biographical Memoirs: Volume 72 Happily the Horsfall clan of James, Sue Belle, daughters, and engineer sons-in-law were close knit. They shared a retreat on Lake George where an octogenarian could teach grandchildren such technology as repairing screen doors. Horsfall channeled his proclaimed nonconformity into plant diseases and policy and wore a tie. He invented fungicides. He broadened the charter of his experiment station to encompass the whole landscape. He died a few weeks after his ninetieth birthday and was buried in New Haven's Grove Street Cemetery near the father of American experiment stations. They shared the belief that theory and practice must march together. NOTES 1.   J. G. Horsfall. The fight with the fungi or the rusts and rots that rob us, the blasts and the blights that beset us. Am. J. Bot. 43(1956):532–36. 2.   J. G. Horsfall. Fungi and fungicides. The story of a nonconformist. Annu. Rev. Phytopathol. 13(1975):1–13. Hereafter cited as Story of a Nonconformist. 3.   P. E. Waggoner (PW). Memo dated October 1, 1984, of conversation with Horsfall. 4.   "To the memory of H. H. Whetzel, stimulating teacher and true friend." Dedication of J. G. Horsfall. Fungicides and Their Action . Waltham, Mass.: Chronica Botanica, 1945. Hereafter cited as Fungicides and Their Action. 5.   International Who's Who, 1969–70. Obituary. N. Y. Times, March 29, 1995. 6.   Handwritten notes by Horsfall, undated but likely written in the 1960s. 7.   Story of a Nonconformist, pp. 5–6. 8.   Recollection of Lois Pierson. 9.   Story of a Nonconformist, p. 16. Years later at the Connecticut Agricultural Experiment Station, Horsfall persuaded his colleague H. B. Vickery that science would be served as well and politics better if he pursued his studies of amino acids with a Connecticut crop: tobacco (told to PW by Horsfall).

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Biographical Memoirs: Volume 72 10.   J. G. Horsfall and E. B. Cowling. Epilogue: Anent a philosophy of plant pathology. In Plant Disease: An Advanced Treatise, vol. 5, eds. J. G. Horsfall and E. B. Cowling, p. 435. New York: Academic Press, 1980. Hereafter cited as Epilogue: Anent a philosophy …. 11.   G. C. Ainsworth. Introduction to the History of Plant Pathology , p. 111. Cambridge: Cambridge University Press, 1981. 12.   J. G. Horsfall, R. O. Magie, and R. F. Suit. Bordeaux injury to tomatoes and its effect on ripening. N. Y. Agric. Exp. Stn. Tech. Bull. 251 (1938):34. 13.   Story of a Nonconformist, p. 6. 14.   Fungicides and Their Action, pp. 118, 124. 15.   Story of a Nonconformist, p. 6. 16.   Story of a Nonconformist, p. 7. 17.   Epilogue: Anent a philosophy …., p. 440. 18.   Story of a Nonconformist, p. 7; Fungicides and Their Action, p. 24. 19.   Story of a Nonconformist, p. 7 H. S. Cunningham and E. G. Sharvelle. Organic seed protectants for lima beans. Phytopathology 30(1940):4–5. 20.   Story of a Nonconformist, p. 7. 21.   J. G. Horsfall. Roland Thaxter. Annu. Rev. Phytopathol. 19(1979):29–35. Horsfall attributed his adopted name "squirt gun botanist" to Thaxter in Epilogue: Anent a philosophy …., p. 437. 22.   S. W. Johnson cited in Epilogue: Anent a philosophy …., p. 438. 23.   A. E. Dimond, J. W. Heuberger, and J. G. Horsfall. A water soluble protectant fungicide with tenacity. Phytopathology 33(1943):1095–97. 24.   J. W. Heuberger and T. F. Manns. Effect of zinc sulphate-lime on protective value of organic and copper fungicides against early blight of potato. Phytopathology 33 (1943):1113. R. W. Barratt and J. G. Horsfall. Fungicidal action of metallic alkyl bisdithiocarbamates. Conn. Agric. Exp. Stn. Bull. no. 508, 1947. The statement "almost certain failure" is on p. 4 of bulletin 508; the quotation about birth of a potato fungicide is on p. 7 of Story of a Nonconformist. 25.   National Research Council. Regulating Pesticides in Food, pp. 208–209. Washington, D.C.: National Academy Press, 1987. 26.   G. A. Zentmyer, J. G. Horsfall, and P. P. Wallace. Dutch elm disease and its chemotherapy. Conn. Agric. Exp. Stn. Bull. no. 498, 1946. Story of a Nonconformist, p. 9.

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Biographical Memoirs: Volume 72 27.   G. C. Ainsworth. Introduction to the History of Plant Pathology, pp. 120–21. Cambridge: Cambridge University Press, 1981. 28.   J. E. van der Plank quoted in Epilogue: Anent a philosophy …., p. 436. 29.   Story of a Nonconformist, p. 10. 30.   J. G. Horsfall, J. W. Heuberger, E. G. Sharvelle, and J. M. Hamilton. A design for laboratory assay of fungicides. Phytopathology 30(1940):545–63. 31.   J. G. Horsfall, S. Rich, and N. Turner. A spiral design for the field assay of pesticides. Phytopathology 38(1948):14. When my statistics teacher endorsed this clever design to me (PW) at Iowa State, it inclined me to join the Connecticut Agricultural Experiment Station when I was given the chance. 32.   J. G. Horsfall. Dusting tomato seed with copper sulfate monohydrate for combating damping-off. N. Y. Agric. Exp. Stn. Circ. 198(1931):5–6. 33.   J. G. Horsfall and J. W. Heuberger. Measuring magnitude of a defoliation disease of tomato. Phytopathology 32(1942):226–32. 34.   J. G. Horsfall and R. W. Barratt. An improved grading system for measuring plant disease (abstract). Phytopathology 35(1945):655. 35.   J. G. Horsfall. This week's citation classic. Curr. Contents 17(1986):14. 36.   J. G. Horsfall. Does the scope of research match the scope of the need? Abstract no. 0020, Second International Congress of Plant Pathology, 1973. 37.   J. P. Hollis. The Horsfall-Barratt grading system. Plant Pathol . 33(1984):145–46. 38.   P. E. Waggoner and J. G. Horsfall. 1969. EPIDEM, a simulator of plant disease written for a computer. Conn. Agric. Exp. Stn. Bull. no. 698, 1969. P. E. Waggoner, J. G. Horsfall, and R. J. Lukens. EPIMAY, a simulator of Southern corn leaf blight. Conn. Agric. Exp. Stn. Bull. no. 729, 1972. 39.   J. E. Van der Plank. Plant Diseases: Epidemics and Control. New York: Academic Press, 1963. 40.   E. A. Osborne. From the Letter Files of S. W. Johnson. New Haven: Yale University Press, 1913. 41.   J. G. Horsfall. The Connecticut Agricultural Experiment Station: New Haven's gift to America. J. New Haven Colony Hist. Soc. 33(1986):27–44.

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Biographical Memoirs: Volume 72 42.   Undated writing of J. G. Horsfall in the 1980s. 43.   J. G. Horsfall. The Connecticut Agricultural Experiment Station: New Haven's gift to America. J. New Haven Colony Hist. Soc. 33(1986):27–44. 44.   Told to his apprentice (PW) about 1970. 45.   Gypsy months and states' rights. Hartford Courant. January 14, 1958. 46.   T. G. Andreadis and R. M. Weseloh. 1990. Discovery of Entomophaga maimaiga in North American gypsy moth, Lymantria dispar. Proc. Natl. Acad. Sci. U.S.A. 87(1990):2461–65. 47.   R. Carson. Silent Spring, p. 12. Boston: Houghton Mifflin, 1962. 48.   J. G. Horsfall. The Pioneer Experiment Station 1875 to 1975: A History, p. 76. Lexington, Ky.: Antoca Press, 1992. 49.   The 1963 Station Field Day was picketed because the speaker had chaired a state task force on pesticide policy. PW recalls the drafting and discharge of Chicken Little. 50.   J. G. Horsfall. The Pioneer Experiment Station 1875 to 1975: A History, p. 73. Lexington, Ky.: Antoca Press, 1992. 51.   Governor's Committee on Environmental Policy. Report. Hartford, 1970. 52.   Sunday Pictorial. New Haven Register. January 2, 1972, p. 1. 53.   Story of a Nonconformist, pp. 10–11. 54.   J. G. Horsfall and A. E. Dimond. Plant Pathology, An Advanced Treatise, vols. 1–3. New York: Academic Press, 1959–60. J. G. Horsfall and E. B. Cowling. Plant Disease, An Advanced Treatise, vols. 1–5. New York: Academic Press, 1977–80. 55.   Story of a Nonconformist, p. 12. 56.   J. G. Horsfall. The Pioneer Experiment Station 1875 to 1975. A History. Lexington, Ky.: Antoca Press, 1992. 57.   Handwritten notes by Horsfall, undated but likely written in the 1960s. 58.   J. F. Kennedy. Address to the National Academy of Sciences, 1963. 59.   Letter dated December 17, 1981, to President F. Press. 60.   J. G. Horsfall. Relevance: Are we smart outside? Phytopathol. News 3(1969):5–9. 61.   J. G. Horsfall, Z. I. Kertesz, and E. L. Green. Some effects of root-rot on the physiology of peas. J. Agric. Res. 44(1932):833–48.

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Biographical Memoirs: Volume 72 62.   Committee on Genetic Vulnerability of Major Crops. Genetic Vulnerability of Major Crops. Washington, D.C.: National Academy of Sciences, 1972. 63.   Committee on Agricultural Production Efficiency. Agricultural Production Efficiency. Washington, D.C.: National Academy of Sciences, 1975.

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Biographical Memoirs: Volume 72 SELECTED BIBLIOGRAPHY 1932 Dusting tomato seed with copper sulfate monohydrate for combating damping-off. N. Y. (Geneva) Agric. Exp. Stn. Bull. 198:1–34. With Z. I. Kertesz and E. L Green. Some effects of root rot on the physiology of peas. J. Agric. Res. 44:833–48. 1937 With R. W. Marsh and H. Martin. Studies upon the copper fungicides. IV. The fungicidal value of the copper oxides. Ann. Appl. Biol. 24:867–82. 1940 With J. W. Heuberger, E. G. Sharvelle, and J. M. Hamilton. Design for laboratory assay of fungicides. Phytopathology 30:545–63. 1941 With G. A. Zentmyer. Chemotherapy for vascular diseases of trees. Proc. Natl. Shade Tree Conf. 17:7–15. With A. E. Dimond, J. W. Heuberger, and E. M. Stoddard. Role of the dosage-response curve in evaluation of fungicides. Conn. Agric. Exp. Stn. Bull. 451:635–67. 1943 With A. E. Dimond and J. W. Heuberger. A water soluble protectant fungicide with tenacity. Phytopathology 33:1095–97. 1945 Fungicides and Their Action. Waltham, Mass.: Chronica Botanica. With R. W. Barratt. An improved grading system for measuring plant diseases. Phytopathology 35:655. 1946 With G. A. Zentmyer and P. P. Wallace. Dutch elm disease and its chemotherapy. Conn. Agric. Exp. Stn. Bull. 498:1–70.

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Biographical Memoirs: Volume 72 1947 With R. W. Barratt. Fungicidal action of metallic alkyl bisdithiocarbamates. Conn. Agric. Exp. Stn. Bull. 508:1–51. 1954 With S. Rich. Relation of polyphenol oxidases to fungitoxicity. Proc. Natl. Acad. Sci. U.S.A. 40:139–45. 1956 The fight with the fungi or the rusts and rots that rob us, the blasts and the blights that beset us. Am. J. Bot. 43:532–36. Principles of Fungicidal Action. Waltham, Mass.: Chronica Botanica. 1957 With A. E. Dimond. Interactions of tissue sugar, growth substances, and disease susceptibility. Z. Pflanzenkr. Pflanzenschutz. 64:415–21. 1959–60 With A. E. Dimond, eds. Plant Pathology. An Advanced Treatise, 3 vols. New York: Academic Press. 1969 With P. E. Waggoner. EPIDEM. A simulator of plant disease written for a computer. Conn. Agric. Exp. Stn. Bull. 698:1–80. Relevance: Are we smart outside? Phytopathol. News 3:5–9. 1970 An Environmental Policy For Connecticut. Report of the Governor's Committee on Environmental Policy. 1972 With P. E. Waggoner and R. J. Lukens. EPIMAY, a simulator of Southern corn leaf blight. Conn. Agric. Exp. Stn. Bull. no. 729. Genetic Vulnerability of Major Crops. Report of the Committee on Genetic Vulnerability of Major Crops. Washington, D.C.: National Academy of Sciences.

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Biographical Memoirs: Volume 72 1973 With R. J. Lukens. Processes of sporulation in Alternaria solani and their response to metabolic inhibitors. Phytopathology 63:176–82. 1975 Agricultural Production Efficiency. Report of the Committee on Agricultural Production Efficiency. Washington, D.C.: National Academy of Sciences. Fungi and fungicides. The story of a nonconformist. Annu. Rev. Phytopathol. 13:1–13. 1977–80 With E. B. Cowling. Plant Disease: An Advanced Treatise, 5 vols. New York: Academic Press.

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