How to prevent powdery mildew
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Powdery mildew is caused by fungi. A layer of white mold appears on the anteroposterior surface of leaves, stems, petioles, and pods, which resembles a cobweb. The first round of small round lesions appeared, after the lesions expand, meet each other, covering all the foliage, the formation of the mat-like mold layer, the late generation of powder spores (conidia), lesions were white powder, the end of the mold layer is light brown Or gray, with orange to black dots that are pathogenic bacteria closed capsule shell. The disease depends on the cysticercosis or dormant hyphae for wintering on the diseased plant residue, and in the spring of the following year, it is infected with powdery spores or ascospores. Control methods: 1. Breeding and promotion of anti-pathogenic varieties; 2. Timely cutting: The closed shell of the pathogen is not formed or begins to form, but when it has not matured enough, the pasture in the field will be cut clean and leave no residue. Strains, to reduce the pathogens of overwintering, pathogenic bacteria for airborne diseases, so the castrated grassland should be carried out in large areas, reducing the castration and non-castrated grass mutual infection. 3, in the early or early onset, with 40% sterilization Dan 700-1000 times spray, once every 10 days, several times, you can reduce the incidence of 72% -90%.