Winter talk about pest control in rapeseed
First, downy mildew. The disease can occur during the entire growth period of rape, and can harm leaves, stems, flowers and pods. 1. Biological control: Use 250 grams (sap) of pepper, ginger and garlic to spray 50 kg of water. 2. Chemical control: When the diseased plant reaches more than 10%, spraying is started, and 58% metalaxyl MnZn wettable powder 600 times, or 25% wet fungal wettable powder 600-800 times liquid, or 50% is selected. TBSF powder 1000 times, or 43% Dashengfu suspension 600 to 800 times, or 58% Methodyl Zn wettable powder 800 to 1000 times, spraying, concurrent treatment of white rust, spraying once every 7 days , even against 2 to 3 times.
Second, rape sclerotinia disease. At the seedling stage, on the neck and petioles close to the ground, red-brown spots are formed and then turned to white. The diseased tissue becomes soft and rot, with white hyphae, and severe cases can cause seedling death. 1. Agricultural control: Drain the drains and remove the diseased, old and yellow leaves in time. 2. Chemical control: When the flowering period of rape is more than 10% or the rate of stem disease is 1% or less, use 25% Prochloraz EC 40-50g spray, or 80% Dofoe Zinc WP 700 -800 times liquid spray, or 30% foramisulfuron suspension 600 to 800 times liquid spray. The plants were sprayed on the lower part of the plant, sprayed every 7-10 days, and sprayed 2 or 3 times.
Third, rape locusts. Aphids are harmful to leaves, stems, flowers, and fruits, causing leaf curling, dead seedlings, plant inflorescences, pods shrinking, or whole plants withered. 1. Physical control: cover about 50% of the ground with silver-gray, milky white and black plastic film, which has anti-virus disease effect. 2. Chemical control: When the seedling rate is 10%, and each locust has 1 to 2 heads, use 40% Dimethoate EC 000-2000 times, or 50% Pipa (anti-Weiwei) Wettable powder 3000 times, or 10% imidacloprid wettable powder 1000 times, or 10% nitenpyram 2000 times spray.
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