Corn borer is the main pest on corn. It damages the stalks and ears of the larvae and feeds on the leaves. It seriously affects the yield and quality of the corn, and the output is reduced by 20% to 30% in the year of retransmission. This year, the occurrence period of corn borers in Tongzhou District of Nantong City is the same as that of the normal year. The occurrence of corn borer is moderate, and partial occurrence occurs. All localities should seize the appropriate period to prevent the generation of corn borers.
According to observations of the adults under the plant protection station of Tongzhou District, Nantong City, observations of adult growth under the lamps were made. On May 10th, we saw moths. On the same day, there were 4 moths. As of May 31, there were 147 cumulative moths. Observing the growth of eggs, the system was observed on May 28, and the number of eggs per 100 eggs was 3 on the day. On June 1st, all types of corn fields were censused in the region, and the number of eggs per 100 eggs was 0-16, with an average of 5.8 eggs. Based on the above pest situation, combined with historical data analysis, it is expected that this year's generation of corn borer will occur moderately and local partiality will occur.
Opinions on prevention and control Spring corn is a major hazard to the generation of corn mash, especially corn fields where the growing period is early and grows well. It is the spawning ground of a generation of corn borer adults. The generation of corn cocoons not only alleviates contemporary hazards, but also can reduce the occurrence of second-generation bases and reduce the harm to summer corn and cotton. Generally, the field where the mosaic rate is up to 10% needs to be controlled by drugs, and it is used during the corn trumpet period. According to the characteristics of a generation of corn borer concentrated in the hazards of corn leaves, it is mastered in the control of the corn trumpet season, and the diseased leaves are treated every 7 to 8 days. 1.5-2.5 kg of phoxim granules per acre and 8-10 kg of dry fine soil are mixed and sprinkled into the leaves of corn; or 16,000 IU/mg of Bacillus thuringiensis WP can be used per acre. A ratio of 1:2.5:25 of medicine, water and dry fine soil was mixed with granules and sprinkled into the corn leaf.

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