First, a variety of leaf spot control measures:
Strengthen the cultivation and management: timely early sowing, reasonable intercropping or wide and narrow rows of planting, planting density should be reasonable, when the dense, the disease increased. Apply organic manure thoroughly. Low drainage should pay attention to drainage and enhance soil permeability.
Chemical control measures: Before and after corn heading, spraying should begin before the disease spreads. When spraying, the bottom diseased leaves should be removed first, and the foliar fertilizer should be added at the same time. Combining topdressing with available fertilizer can not only control the spread of diseases, but also promote the robustness of the corn and enhance the disease resistance.
1, small spot disease: 75% chlorothalonil WP, 50% carbendazim WP, 500 times more water spray; 7 to 10 days, a total of 2 or 3 times.
2, large spot disease: tasselling period or early onset of spraying 50% carbendazim WP 500 times every 10 days to prevent a single, continuous control 2-3 times.
3, brown spot: corn initial disease with 25% triadimefon (triazole copper) wettable powder 1500 times spraying stems and leaves or with 70% thiophanate-methyl 500 times spray, spray 7-10 days Once, spray 2-3 times.
Second, various pest chemical control measures
1. Chemical control measures for corn borer: The control index was 100 thousand strains and 10000 heads. Can be used 10% imidacloprid WP 2000 times or 2.5% high-performance cyanide polyester 2000-3000 times spray.
2. Chemical control measures of armyworm: The control index is 120 insects. In the younger stage of larvae timely medication, the agent can choose 40% phoxim EC 1000-2000 times solution, or 4.5% beta-cypermethrin EC 30-60ml/mu water 50 kg spray, pay attention to spray uniform, thoughtful, four land, Roadside weeds must be sprayed.
3. Chemical control measures such as corn cockroaches and other pests: In addition to corn cobs, there are bollworm, armyworm, and sorghum strips. The optimal period of control is when the filaments begin to wilt after pollination. When pests reach 25% to 30%, or if there are 40 heads of pests, pesticides are used immediately. One is the liquid perfusion of tassels: commonly used agents are 50% dichlorvos EC 800 times, 90% trichlorfon crystals. These liquids were all filled with 10 milliliters per plant perennial corn tassels. And then the liquid spot: Take 50% of the dichlorvos emulsion 800 times into a bottle with a thin plastic tube. Drop a few drops of the drug on the base of the filament at the tip of the ear and kill the larvae. Or align the filament spray with 4.5% beta cypermethrin 1500 times.
When the above pests and diseases occur in a mixed manner, the above insecticidal fungicides can be used in combination to treat the diseases and diseases. In terms of prevention and control strategies, we focused on pests, treated both diseases and insect pests, strengthened ecological control, supplemented with chemical agents to control pests and diseases, fully and effectively controlled the diseases and pests of corn, ensured the safety of corn production, promoted agricultural production, and increased farmers' income.
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