Control method of anthracnose of Shanghai green with long white spots on leaves and long brown spots on petioles
Anthracnose often occurs from June to September in Shanghai. The planting density is too high, the field is closed, the permeability is poor, Rain Water is more, easy to accumulate water after rain, often lack of fertilizer and water, Shanghai green growth potential is poor, the disease is serious. Shanghai green anthracnose is mainly harmful to leaves and sometimes to petioles. In the early stage of the disease, the leaves produce white in the middle, brown near round sunken spots on the edges, white or gray-white translucent spots in the later stage of the disease, and easy to perforate in dry weather. Petiole disease often forms a long oval or fusiform, yellowish brown to grayish brown, the edge color is slightly deep sunken spot, and the disease spot often cracks to both sides in the later stage.
Anthracnose in Shanghai
Prevention and control methods: planting density should be reasonable, strengthen fertilizer and water management, promote green and healthy growth in Shanghai, drain stagnant water in time after rain, remove disease and residue in the field in time after harvest, take it out of the field and destroy it centrally.
Seed treatment. Seed dressing with 25% bromofenitrile wettable powder or 50% amidomide manganese compound wettable powder according to the seed weight of Shanghai green 0.3%, or 2.5% chlorobenzonitrile suspension seed coating.
In the early stage of the disease, the following fungicides can be used to prevent and cure the disease: 1000ml 1500 times of 20% azoxystrobin water dispersible granules, 600ml 800 times of 80% Dysen zinc wettable powder, 2500ml 3500 times of 20% phenylether ·prochloraz microemulsion, 3000 times of 50% ethoxim dry suspension and 600ml 800 times of 70% promethrin zinc wettable powder. 30% benzothiocyanate EC 1000ml 1500 times + 70% Dysenlian water spray on water, depending on the condition of green anthracnose in Shanghai, once every 10 days, for 3 times in a row.
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