Scientific name Chenopodium album L. Alias ​​PCT, Manhua, Menghua, and grey vegetables. An annual herb of the family Anatidae. Take the whole plant medicine. With heat, dampness, insecticidal effect. Can cure dysentery, diarrhea, poisonous insect bites and other embolism. Distributed throughout the country.
Symptoms mainly affect the leaves. The lesions on the leaves are irregular to irregular, with a size of 5-20 mm. The leaves are bright yellow-green on the front and have no edges. Dark gray molds are produced on the back of the leaves, which are cysts and sporangia of pathogens.
The pathogen Peronospora farinosa (Fries) Fries is a powdery mildew that belongs to the flagellin subfamily fungi. The cyst size 180-5205-15 (μm). The sporangia are light brown with a small peduncle at the base and the size is 15-3213-22.5 (μm). The oospores are spherical, light yellow and have a size of 20-22.57 μm.
Transmission Pathways and Pathogenic Conditions Germs are borne by oospore on the sick or in the soil. When the conditions of late spring are suitable, the oospore germination causes initial infection, and a large number of zoospores generated on the lesions are spread by rainwater splashes and continuously reinfested. The northeast, northwest, and north China can occur in May-June. The spring is cold and rainy, which is conducive to the disease. It can last until September.
See the control method of peppermint downy mildew.
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