. Fungous diseases of plants, with chapters on physiology, culture methods and technique . Fig. 75. ScLEROTiNiA LiBERTiANA. (After R. E. Smith)<?, sclerotia and apothecium ; b^ penetration of hyphae Control. In the case of this fungus, as well as the species ofSclerotinia next discussed, good sanitation is important. Never-theless, in the greenhouse it may be necessary to sterilize thesoil 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 Agl. Exp. St
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . Fig. 75. ScLEROTiNiA LiBERTiANA. (After R. E. Smith)<?, sclerotia and apothecium ; b^ penetration of hyphae Control. In the case of this fungus, as well as the species ofSclerotinia next discussed, good sanitation is important. Never-theless, in the greenhouse it may be necessary to sterilize thesoil 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 Agl. Exp. Sta. Rept. 10: 212-224. P^^- i-^- 1892. Smith, R. E. Botrytis and Sclerotinia: Their Relation to Certain Plant Dis-eases and to Each Other. Bot. Gaz. 29: 369-407. pis. 2^-2/. Stone, G. E., and Smith, R. E. ^ Drop of Lettuce. Mass. (Hatch) Rept. 9: 79-81. 1897. (Compare, also, 10: 55-58, 1898; and 11:149-151, 1899.) ASCOMYCETES 199 Symptoms, effects, and hosts. It is difficult to determine howmany of the reported sclerotial diseases of greenhouse and gardencrops may be due to thi
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