Now is the season of rape blossoms, so be sure to protect it. Rape white rust is a fungal disease that is easy to occur during rapeseed. How should rapeseed white rust be prevented?
Once rapeseed white rust disease will cause heavy losses to rapeseed, we must pay attention to the prevention and control of rapeseed white rust, and should not be blind.
Symptoms of rapeseed white rust:
All parts of the aboveground part of the rapeseed can be susceptible to disease. The leaf surface is initially pale green and small spots, followed by a yellow round lesion, and the white lacquer plaque grows at the lesion on the back of the leaf, and the white spot is scattered after the plaque is broken. In severe cases, the diseased leaves are yellow and fall off. Young stems and stalks are swollen after being damaged, and they are bent into a "faucet" shape, commonly known as "faucet disease". The flower is damaged, the petals are deformed, inflated, green and leafy, not wilting for a long time, and not strong. The affected stems, branches, pedicels, flower organs and pods can grow oblong or short strips of erythema and white mildew.
Oilseed rape white rust control measures
1. Select resistant varieties. Mustard-type rapeseed is the most resistant, followed by cabbage, and cabbage is susceptible. There are many varieties with high resistance, which can be selected according to local conditions.
2. Use disease-free plants to keep seeds or seed treatment.
3. Cultivation and disease prevention. Take water-and-dry rotation or non-cruciferous crop rotation, rational fertilization, apply enough base fertilizer, re-apply nursery and fertilizer, remove old diseased leaves and "faucet", deep ditch narrow, prevent waterlogging and other disease prevention measures.
4, chemical control. Spray at the height of 17 to 33 cm or the initial flowering period when there is more incidence on the brachial stalk. Use 25% toxic WP WP 600-800 times solution, 80% Ethyl aluminum WP 500 times solution, 50% Torroxin WP 1000-1500 times, 50% sterilized WP 1000 times Liquid, 65% Dyson zinc wettable powder 500 times solution, spray at the initial flowering stage leaf disease rate of 10% or more, spray once every 7 days, spray 2 to 3 times, 50 kg per spray per acre.
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