Corn is an important field crop in China. In the process of corn planting, some pests and diseases will inevitably be encountered. What should we do in the face of these pests and diseases? This article will introduce the methods of controlling pests and diseases in summer corn ear.
The summer maize ear is the prosperous period of various pests and diseases, mainly including leaf spot, brown spot, rust, corn borer, and third-generation armyworm. Its control indicators are large and small leaf spot and Curvularia leaf spot. The disease rate was 10%-20% before and after heading, 15,000 heads of corn borer, 120 heads of three-generation armyworm live corn field, and 30 heads of corn earworm.
Disease, Curvularia leaf spot can be sprayed with 50% chlorothalonil, 50% carbendazim, 70% methyl thiophanate 500 times liquid spray; prevention and control of large leaf spot disease, 40% g sputum, 50% bacteria Ling, 75% mancozeb and other pharmaceutical agents 500-800 times liquid spray control; prevention and treatment of brown spot disease, can be controlled by 50% carbendazim, 70% methyl thiophanate 500 times spray; prevention and control of corn rust, in the early stage of the disease, It can be controlled by spraying with 20% rusting emulsifiable concentrate of 75-100ml per acre.
Insect pests, corn ear worms can be controlled by 90% trichlorfon 800 times droplet irrigation; corn mash can be sprayed with 10% imidacloprid 10-15g per acre to 45kg of water; third generation armyworm can be sprayed with 50% phoxim 1000 times solution. The same type of snail, one is artificially captured, using leaves, weeds, vegetable leaves, etc. to be trapped in the field, so that the snails lurk in the trap pile, and then concentrate to capture and eliminate before dawn; second, chemical control, per acre 6% vortex or 6% granules, 250-400 grams per acre.
At the same time of drug treatment, pay attention to the protection and use of natural enemies to control pests. Corn is not only a variety of pests, but also a breeding ground for many beneficial natural enemies. Protecting natural enemies in corn fields is not only beneficial to controlling corn pests, but also for leap years. The natural enemies of pests provide more insect sources and should pay attention to protection and utilization. First, when the parasitic rate of corn cocoons is more than 60%, natural enemies can be used to control the hazards without applying drugs. Second, when the ratio of benefits to disorders is imbalanced, biological control techniques can be used. The use of 100-150ml Bt emulsion plus 5kg of fine sand is applied to the heart leaves, which can effectively control corn borer.
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