Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] PHYLLOSTICITA 411 Apple blotch.âScott and Rorer have quite recently de- scribed a serious disease attacking apples in the United States. The injury is caused by Phyllosticta solitaria (Ellis and Everh.). The fungus forms cankers on the young shoots ;â irregular, light brown, yellowish, or whitish, quite small patches on the leaves; and blackish, irregular patches on the fruit, the surface of which often cracks in consequence. Minute black perithecia are produced in abundance on
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] PHYLLOSTICITA 411 Apple blotch.âScott and Rorer have quite recently de- scribed a serious disease attacking apples in the United States. The injury is caused by Phyllosticta solitaria (Ellis and Everh.). The fungus forms cankers on the young shoots ;â irregular, light brown, yellowish, or whitish, quite small patches on the leaves; and blackish, irregular patches on the fruit, the surface of which often cracks in consequence. Minute black perithecia are produced in abundance on diseased spots, both on twigs, leaves, and fruit. The first spring infection is due to spores produced on infected twigs. Fig. 12.âPhyllosticta frunicola. 1, apple leaves attacked by fungus ; 2, section through a perithecium embedded in the substance of the leaf; 3, conidia. Figs. 2 and 3 mag. Perithecia minute, immersed in the matrix, the mouth alone rupturing the epidermis, appearing as minute raised points; conidia hyaline, broadly elliptical, continuous, sur- rounded by a mucilaginous sheath which runs out at one end of the conidium as a hyaline appendage, which is apt to be overlooked, 8-10 x 5-6 ji. I have repeatedly met with perithecia containing conidia precisely similar to those described above, during the spring months, growing from the stroma-like portion of Venfuria
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