. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 198 FUNGOUS DISEASES OF PLANTS conditions the perfect form from sclerotia of the Botrytis. It would seem that Istvanfn has now secured substantial proof that these are pleomorphic stages of a single fungus. Much interesting biological work has been done upon this fungus. Infection results most readily from sclerotia or from a mycelium which has been growing saprophytically. Infection frequently fails when conidia germinate directly upon the sur- faces of delicate parts. Upon penetr
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 198 FUNGOUS DISEASES OF PLANTS conditions the perfect form from sclerotia of the Botrytis. It would seem that Istvanfn has now secured substantial proof that these are pleomorphic stages of a single fungus. Much interesting biological work has been done upon this fungus. Infection results most readily from sclerotia or from a mycelium which has been growing saprophytically. Infection frequently fails when conidia germinate directly upon the sur- faces of delicate parts. Upon penetrating a plant there is, first, a direct poisoning effect, supposedly due to oxalic acid, resulting in the death of adjacent cells; and, second, there is more or less digestion of the cell contents and Fig. 75. Sclerotinia Libertiana. (After R. E. Smith) a, sclerotia and apothecium ; b, penetration of hyphse Control. In the case of this fungus, as well as the species of Sclerotinia next discussed, good sanitation is important. Never- theless, in the greenhouse it may be necessary to sterilize the soil in order to control the disease effectively when it becomes virulent. IX. LETTUCE DROP Sclerotinia Libertiana Fuckel Humphrey, J. E. Diseases of the Cucumber Plant. A Sclerotium Disease. Mass. Agl. Exp. Sta. Rept. 10: 212-224. pis- 1-2. 1892. Smith, R. E. Botrytis and Sclerotinia: Their Relation to Certain Plant Dis- eases and to Each Other. Bot. Gaz. 29 r 369-407. ph. 25-2-/. Stone, G. E., and Smith, R. E. " Drop " of Lettuce. Mass. (Hatch) Exp. Sta. Rept. 9: 79-gi- 1S97. (Compare, also, 10: 55-58,1898; and 11: 149-151, 1899.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Duggar, Benjamin M. (Benjamin Minge), 1872-1956. Boston ; New York : Ginn
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