Aster pest control method:
There are often leaf spot, downy mildew and powdery mildew hazards. It can be sprayed with 10% antibacterial agent 401 acetic acid solution 1000 times solution. The mites and blind mites are harmed, and 10% of the worms are used to spray the emulsifiable concentrate 3000 times. Spot blotch: Harmful leaves, sprayed 1:1:120 Bordeaux mixture before and during the onset of the disease, once every 7-10 days, several times in succession.
Black spot : Black spot disease is the damage to leaves and petioles. It often produces round or elliptical dark brown lesions on both sides of the leaves of the plant. The diameter is 5 to 25 mm, slightly rounded and the edges are obvious. The lesions on the petiole are fusiform, dark brown. In the late stage of the disease, black mold is formed on the lesion, which is the conidiophore and conidia of the pathogen. The lesions meet each other for a long time, causing the leaves to partially or completely die. The incidence is heavier in high temperature and high humidity, and occurs from May to October.
Control method:
1 Clean the pastoral after harvest, concentrate on burning the sick body; strengthen cultivation management, drain the ditch in time after rain, and reduce the humidity in the field.
2 In the early stage of the disease, 50% of the antipyretic 800 times solution, 50% of the manganese manganese 600 times solution or 50% of the antibacterial 500 times solution is sprayed, and sprayed once every 7 to 10 days for 2 to 3 times.
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