According to the forecast of insect pests released by the national corn industry technical system, from the end of June to the beginning of July this year, the occurrence area of ​​the two-pointed armyworm in the summer, summer, and summer of the Huang-Huai-Hai area will exceed that of last year, and local or outbreaks will occur.
The two point insects are a new corn pest. After the emergence of wheat stubble corn can be harmful, bite off the corn seedlings, or drill rake corn stem base, the formation of dry dead heart, corn lodging, severely affecting yield.
Control of adult insects to reduce the source of insects
The prevention of oviposition in the field of adults of E. apetala is effective as a simple method to reduce the damage by effectively reducing the number of larvae. After the harvest of wheat in mid-June, during the corn planting stage, two generations of adult Aedes moth are in the peak period, and insecticides with contact and fumigation can be sprayed, such as 48% chlorpyrifos EC 800 to 1000 times, 30% acetomethamine Phosphorus EC 600 times, or 80% DDVP 1000 times to 1500 times, 2.5% Lambda-cyhalothrin EC 2500 times, and 4.5% Beta Cypermethrin EC 1000 to 2000 times the whole field uniform spray control. In order to increase the effect of killing eggs, it is possible to add 10% Suppository EC 2000 times. Early prevention and control can be carried out in conjunction with sealing chemical weeding. Areas where conditions permit can give priority to pesticide-free lamps, sex attractants and other pollution-free prevention and control technologies.
Early larvae control improves control
The 2nd instar larvae are very sensitive to pharmacological agents, and the individuals are small, only 0.5 cm, and the pests are under the cover of corn ridges, and the damage to corn is not obvious at this time. This stage can be controlled by spraying method. The agent can be used as follows: 50% phoxim 1000 times, 20% chlorantraniliprole 4500 times, 80% dichlorvos 1000 times, 48% chlorpyrifos 1200 times Such as any one of them, per acre liquid medicine 45kg, uniform field spray control.
Medium-term control and control hazards
When the larvae enter the third instar, the food intake and drug resistance are significantly increased, and the hazard will rapidly increase. The pests have concentrated on the roots of corn seedlings and started biting and drilling on the base of the corn stems, causing the heart of the corn seedlings to wilted to death. According to the test, bait and poisonous soil are used to prevent and control at this time, and its control effect is obviously better than other control methods.
The poison bait can be made of 48% chlorpyrifos EC 50ml, or 80% dichlorvos EC 200ml, add appropriate amount of water and stir evenly in sauteed wheat bran 5kg, or 48% chlorpyrifos EC 100ml + 80% dichlorvos EC 150ml + leafy cabbage leaves (or weeds) ) +5kg sauteed wheat bran, or 30% poisonous microcapsule suspension 500mL, mix 25 pounds of sauteed wheat bran, and then heap stuffy for 2 hours. In the evening, sprinkle a small heap around the base of the corn seedlings about 5cm from the corn seedlings. Wheat straw is thicker at a thicker place, and generally no longer increases the risk of seedlings the next day.
Toxic soil can use 80% of dichlorvos EC per acre 300ml~500ml, or 48% of chlorpyrifos EC 400~500ml, or 30% Poison Microcapsule Suspension 500mL, add appropriate amount of water evenly into 25kg fine soil, in the morning Shun ridge Apply on corn seedlings.
Emergency prevention and control reduce losses
As farmers did not take the above measures in time, serious larvae of 4th-age or older larvae would appear on some plots. At this time, the body length of the larva has reached more than 1 cm, and it is in a period of gluttony and has the habit of transforming plants. A large number of pests drilled and gnawed the base of the corn stems and bite corn secondary roots. The rate of dead seedlings and lodging in the field increased rapidly and should be taken immediately. Quantian Drip Prevention and Control Measures for Preventing and Controlling Larvae . (1) Spray corn root circumference: Unscrew the sprayer spinner or spray it on the stem base of corn seedling with straight sprayer. The agent can use 48% chlorpyrifos cream 1500 times liquid or 30% acephate cream oil 1000 times liquid Wait. (2) Dosage with water. 48% chlorpyrifos EC 800ml or 50% phoxim EC 500ml + 48% chlorpyrifos EC 300ml, diluting the selected agent and filling it into a Coke bottle, placing the infusion tube device on the outlet of the well and putting the solution Evenly mixed with irrigation water and poured into the field.
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