. Fungous diseases of plants, with chapters on physiology, culture methods and technique . HERRYCylindrosporium Padi Karst Arthur, J. C. Plum-Leaf Fungus. N. Y. Agl. Exp. Sta. Rept. 8: 293- 298. Jigs. 6-10. , F. C, and Eustace, H. J. Shot-Hole Fungus on Cherry Fruit Pedicels. N. Y. Agl. Exp. Sta. Rept. 20: 146-148. Host relations. Many of the leaf-spot fungi occurring uponcertain varieties of plums, cherries, and other stone fruits are to aconsiderable extent shot-hole fungi. In such casesthe more or less circularinjured area is separatedby a line of cleavage fromthe healthy tissue
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . HERRYCylindrosporium Padi Karst Arthur, J. C. Plum-Leaf Fungus. N. Y. Agl. Exp. Sta. Rept. 8: 293- 298. Jigs. 6-10. , F. C, and Eustace, H. J. Shot-Hole Fungus on Cherry Fruit Pedicels. N. Y. Agl. Exp. Sta. Rept. 20: 146-148. Host relations. Many of the leaf-spot fungi occurring uponcertain varieties of plums, cherries, and other stone fruits are to aconsiderable extent shot-hole fungi. In such casesthe more or less circularinjured area is separatedby a line of cleavage fromthe healthy tissue, the in-jured tissue within thisarea promptly contracting,drying, and falling is respon-sible for the greater portionof this shot-hole trouble onmany varieties of plumsand cherries in some varieties of thedomestica type, as also onsome cherries, the fungusmay be common, produc-ing spots only, or withinconspicuous shot-holeeffects. This is also trueof the Mahaleb Japanese plums, on ^^^ ^^^ Shot-Hole Disease of Chokethe other hand, show a Cherry. 340 FUNGOUS DISEASES OF PLANTS very pronounced shot-hole effect. Varieties of Pruniis aiuericmtaare frequently free from this fungus. Where a species or variety is subject to shot-hole diseases a shot-hole effect may also be produced upon the leaves by spraying withany substance injurious to the leaf. When theleaves are so severely injured that the spots coa-lesce, the large irregular pieces may fall out inthe same manner as just indicated. In anycase the effects of shot-hole troubles on the leafare frequently very severe, so that practicallycomplete defoliation of the trees may take placeby midsummer. The fungus. In many cases the development of the acervuli of the fungus is not evident before the diseased areas have fallen away, but varieties in which the injured areas are persistent exhibit the fruiting pustules in great quantity. In such cases the spores may be seen to issue from the acervul
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