Corn borer, also known as corn borer, is one of the main pests of corn. In recent years, the occurrence and damage of corn borer has increased year by year. At present, summer corn will enter the big bell mouth period, which is a crucial period for prevention and control.
I. Hazard characteristics Corn borer is a borer pest. The larvae are stalked into the stem by stems and sheaths. They feed on the pith and affect the nutrient transport. The damaged plants are not full or even grain-free. The larvae can be drilled into the male inflorescences, often causing the male inflorescences to break at the base, feeding on the filaments and tender leaves of the ears, and also entering the cobs or eating young seeds. The stalks of the stalks are easily broken by strong winds, causing severe production cuts.
Second, the prevention and control method Corn heart leaf period, that is, the big bell mouth period, is a key period for the prevention and control of corn borer at the earing stage.
1. Heart leaf granule control. 3% phoxim granules can be used, 0.3-0.4 kg per acre to control the heart; or 50 kg of 50% phoxim emulsifiable concentrate can be used for mixing, 40 kg of fine sand or fine ash, 3-3.5 kg per acre; or BT emulsion 200 ml per mu, add a small amount of water, mix fine sand 5-7.5 kg, sprinkle in the corn heart.
2. Heart leaf stage drug solution prevention. At the 2-3 year old larvae, use 80% to 100% cyanopentyl phoxim emulsifiable concentrate, or 70% to 90% chlorpyrifos EC, or 4.5% cypermethrin emulsifiable concentrate, or 20% chlorantraniliprole. 10 ml of suspending agent, 40-50 kg of water, 10 ml per plant.
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