Corn borer is corn borer. The current spring corn is in the late stage of the heart and leaves (trumpet period), this period is the best time to prevent corn borer.
Most of the newly hatched corn borer larvae in the bell-mouth period crawled into the heart tuber, and they took in the leaves and leaves that had not yet been unfolded. Moreover, spraying the medicine at this stage would easily make the liquid into the heart leaf tube, and the control effect was better. After Lu Xiong, the bell mouth disappeared, and most of the corn borers entered the tassel for feeding. The liquid was not easy to come into contact with the body, and the control effect was poor. The trumpet corn stubble control method is as follows:
The tassel corn borer, which manually removes the insect-bearing strains, prefers to lay eggs on the host plants that are growing vigorously, with dark green leaves and tall plants. Therefore, in the same field, there are more insect pests in the tall green corn plants, and the insects are harmed at the beginning. There are transparent spots after the leaf is unfolded. At this point, the tassels of the insect-bearing strains can be removed together with 2-3 pieces of heart-leaves and treated in a centralized manner. This method is used in the field where corn borer does not harm much, and it can eliminate the trouble of playing medicine in all fields.
Chemical control agents must prevent the trumpet period and pour the liquid into the bell mouth. Pharmacy should use non-polluted pesticides, especially fresh corn such as sweet corn and waxy corn. Bio-agricultural Bacillus thuringiensis can be used for 500-1000 times of heart filling. Nen Pau harvested any pesticides for the first 15 days to ensure food safety.
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