How to control white rust of hollow cabbage
1. Rotation with other vegetable varieties for 2 to 3 years. Second, before sowing, seed dressing and sterilization shall be carried out according to the proportion of 100kg seeds 300g and 35% metalaxyl; third, at the initial stage of the disease, 6000 to 7000 times solution of 50% nail cream copper wettable powder, or 8000 times solution of 72.2% pric water agent, can be sprayed once every 7 to 10 days. To infect again. Rain Water and insects can also spread, but whether seeds can be spread remains to be studied. Cool and wet at night, warm during the day, heavy fog, and the condition of sticky and wet soil is conducive to the occurrence and prevalence of the disease. 3. Control methods 1. Select disease-free seeds and seed treatment: select disease-free land to keep seeds, soak the newly bought seeds in 50 ℃ warm water for 25 minutes, cool and sow. 2. Strengthen the management of garden fields: select plots with high terrain, good drainage and ventilation for planting. Apply enough fertilizer and increase the application of phosphorus and potassium fertilizer. Irrigate properly so as not to make the green onion floor too wet. If you find a diseased plant, remove it and bury it in time. After harvest, the disease and residue were thoroughly removed, concentrated treatment, and deep ploughing was carried out to reduce the source of bacteria. 3. Chemical control: spray at the initial stage of the disease, once every 7-10 days, 3-4 times in succession. The commonly used agents are 1240,300 Bordeaux solution, 40% aluminum ethyl phosphate wettable powder 200300 times, 25% metalaxyl wettable powder 1000 times, 75% chlorothalonil wettable powder 500,600 times, 65% Dysen zinc wettable powder 500700 times, 64% poison alum, M8 wettable powder 500x. 66.5% Pulic water agent 700-1000 times.
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How to manage asparagus in solar greenhouse
After planting or direct seeding of asparagus seedlings, ploughing and loosening the soil should be carried out many times in order to increase the ground temperature, promote rooting and remove weeds in the field. Asparagus seedlings need less water at seedling stage and can be irrigated properly. The soil should be kept moist after harvest. After the first harvest, 15 kg of urea or diammonium phosphate per mu.
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How to control "white rust" of asparagus
Due to the high temperature and rain after the beginning of summer, asparagus is prone to white rust. Once the disease occurs, it not only reduces the yield, but also affects the quality. First, at the beginning of the onset of the symptoms, the disease spot appears yellowish to yellow spot on the front of the leaf, then gradually browns, the disease spot is larger, and the back of the leaf is white blister-like spot, nearly round or elliptical.
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