Control of soybean root rot
1. Disease resistant varieties were selected.
two。 Rotation with corn, millet, sweet potato and other non-host crops.
3. Increase the application of farm manure, potash fertilizer, phosphate fertilizer and so on when sowing.
4. When sowing, metalaxyl granules were applied to absorb soybean roots and prevent root infection.
5. Mix seeds with 35% metalaxyl powder with 0.3% seed weight before sowing.
6. Strengthen field management, timely deep ploughing and mid-ploughing soil weeding, timely removal of stagnant water after rain to prevent excessive humidity.
7. Find out the diseased plant in time, thoroughly remove the remnant of the diseased plant, and spread quicklime around the planting hole of the diseased plant to disinfect.
8. After the occurrence of the disease, it is difficult to cure and should give priority to prevention. For prevention, you can choose 40% Gen Fuling 400x solution, or 70% methyl thiophanate wettable powder 1000 times solution, or 58% Ruidu wettable powder 600x solution, or 50% carbendazim wettable powder 400x solution, or 75% chlorothalonil wettable powder 600x solution, or 77% chlorothalonil wettable powder 600x solution, or 64% trichlorothalonil wettable powder solution 900x. Any of the above pesticides was sprayed with 600x liquid fertilizer, 500x fulvic acid solution and 1000 times rooting powder solution. Spray every 7 days, 2-3 times in a row, using alternately, focusing on the base of the main stem of the plant. If the above solution is used to irrigate the root of the plant, the effect is better.
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Soybean Fusarium mycorrhizal rot
Symptoms: Fusarium mycorrhizal rot is one of the common root rot diseases of soybean. It mainly occurs in the seedling stage. The root and stem basal therapy of the diseased plant produced oval brown strip to irregular concave spot, which expanded into a large patch around the main root, and some damaged the lateral root. The fungus is mainly harmful to the cortex, resulting in slow emergence of diseased seedlings, chlorosis of cotyledons, less lateral roots and fibrous roots, black roots in the later stage, epidermis rot, yellowing and dwarfing of diseased plants, early shedding of leaves under treatment, diseased plants generally do not wither and die, but few pods and small grains. Prevention and control measures should be taken to give priority to prevention. (1) choose anti-
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Occurrence and Control of Cotton Root Rot in Northern Xinjiang
In 2007, northern Xinjiang suffered varying degrees of cooling and rainfall in April, May and August, respectively. Cotton root rot occurred seriously, and the incidence of cotton fields reached 20% to 50%, which had a certain impact on cotton production in northern Xinjiang. First, the symptom pathogen overwintered with chlamydospores on the plant remains in the soil, and germinated and infected the following year. After the cotton was infected, the leaves shrunk or wilted, and soon fell down and died. The base and root of the diseased seedling were purple-brown, gradually rotted, the cortex was dry-rotten, pulled out from the soil, and the root was rotten brown.
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