The use of chemical drugs to prevent and treat larvae before the third instar is better, the amount of liquid used per mu according to the size of the corn plant, before jointing with 30 to 40 kilograms per mu, after jointing with 50 to 60 kilograms of mu, spray uniform, positive leaves On the back, taking care of it, it doesn't leak, and it rains for 8 hours. When the maize field has 100 to 20 strains of 30 insects, and 100 to 100 strains of insects in the middle and late stages of growth, it will be treated with pesticides. Available 2.5% trichlorfon powder, spray 2 to 2.5 kg per acre, or 2.5% dipterex 1000 to 2000 times liquid spray, or 2.5% deltamethrin EC, 20% quick phase EC 1500 to 2000 times liquid .
The use of biological control can be sterilized in the young larvae period 1 ~ 3 200ppm spray, efficacy is more than 94.5%, and does not kill natural enemies, crop security, the amount of less does not pollute the environment. You can also use adult spawning habits. From the beginning of your spawning period to the end of the progeny period, you can trap and kill the sweetgrass in the field. The sweet and sour sauce is seduce by the ratio of sugar 3 : liquor 1 : vinegar 4 : water 2 and mix thoroughly. production.
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