. Fig. 23.—Cauliflower plants affected by root rot in a low, wet corner of the field. fected plants is the only method known at present for holding these virus diseases in check. White Rust.—In this disease, the stems, leaves, or flower stalks may be swollen and deformed. White, blisterlike, spore pustules of the fungus. Albugo Candida, appear on the surface. The disease is not often serious, but is most common on radish and certain cruciferous weeds like shep- herd's purse. Affected plants should be destroyed. Yellows.—This is a very serious disease of cabbage in many parts of the country but
. Fig. 23.—Cauliflower plants affected by root rot in a low, wet corner of the field. fected plants is the only method known at present for holding these virus diseases in check. White Rust.—In this disease, the stems, leaves, or flower stalks may be swollen and deformed. White, blisterlike, spore pustules of the fungus. Albugo Candida, appear on the surface. The disease is not often serious, but is most common on radish and certain cruciferous weeds like shep- herd's purse. Affected plants should be destroyed. Yellows.—This is a very serious disease of cabbage in many parts of the country but, like several other cruciferous diseases, is practically unknown on this crop in California. It is common here in certain dis- tricts on kale, possibly on account of higher temperatures during the growing season. Affected plants have a yellow, sickly, dwarfed appear- ance, sometimes on only one side, and the leaves wither and drop off one by one, beginning with the lowermost. If the plant survives, it may be- come an elongated, naked stalk with a small tuft of leaves at the top. A
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Keywords: ., bookcentury1900, booksubjectagriculturalpests, booksubjectplantd
