According to the results of pest forecast, the granules are generally used to control the young larvae before and during the late (trumpet) tasseling of the new maize leaves, ie from July 5 to July 15. The following agents are recommended:
(1) 3% phoxim granules filling heart leaves
0.5-0.75 kg per acre, evenly applied to new leaves of corn
(2) Le Sibu granules filling the leaves
With 40.7, 0.5 kg of Lesquin emulsified with 25 kg of fine sand, and used about 1 kg of granule per acre.
(3) BT granules (Bacillus thuringiensis), the amount of mu 150ml against the amount of water, and then mixed with 1.5 - 2 kg of fine river sand, dried after filling the heart of leaves.
(4) Beauveria bassiana granules: Use 30 grams of Beauveria bassiana powder containing 50 billion spores per gram against 1.5 kg of fine sand, and mix the leaves with even irrigation.
((3)(4)) The above two biological agents are mixed evenly, and are used with the mixture. At the beginning and end of corn leaves in the middle of corn leaves.
Other pharmaceutical control:
(5) Spray control of chemical drugs: spraying, such as 40.7% chlorpyrifos, imidacloprid, butylthiocarbamate, and other highly effective, low-toxic, low-residual insecticides.
(6) If the second generation of corn borer is harmful, according to the characteristics of the second generation of corn borer larvae mainly concentrated on the damage of the female silk, the method of liquid injection can be adopted to prevent and control, that is, to use 50% of dichlorvos 800— 1000 times liquid, 10 ml per plant perfusion of the ear, or a few drops at the base of the head of the silk ear, so that the liquid penetrated into the filaments, smoked in the top of the ear damage larvae. Or use high pole crop sprayer for chemical spray control.
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