Corn borer, also known as corn borer.
First, the main symptoms
The leaves of the heart are drilled and eaten at the leaf stage of the corn, and when the leaves are opened, holes are formed. After heading, it was plucked into the stalk or ear, and at the heading stage, it was also able to bite into the corn silk, tender grains, or into the cob. Damaged stalk tissue suffers damage, affecting the transport of nutrients, which results in incomplete development of the corn spikes and reduced yields. The stalks are easily damaged by the wind after they are smashed.
Second, prevention and control measures
1. Agricultural control of corn borer The mature larvae are used for wintering in corn stalks or corn root stalks. Corn stalks and cobs are treated with alfalfa, rolling, sorghum, and mud seals prior to adult eclosion in winter and spring to eliminate overwintering insect sources.
2. Chemical control In the leaf stage of corn, when the flower leaf rate reaches more than 10%, the granules have the best control effect at the end of the tassel period (large bell-mouth period). 0.3% phoxim granules or 1% 1605 granules, 2.5% carbaryl and 3% carbofuran granules can be poured into corn big bell mouth, 50% ethyl 1605 emulsion can also be used 1 kg with 10 kg water dilute Into the fine 50 kg sieve slag particles, scattered into the big bell mouth, the amount of each plant. When the mosaic rate of the middle leaf stage has reached more than 30%, it should be controlled once and then treated once at the end of the heart. At the time of heading, 50% of dichlorvos EC can be used to drip the female filigree heart from 800-1000 times.
3. Bacterial use of Bt emulsion containing 10 million yuan per gram or Bacillus thuringiensis bacterial pesticide such as Bt-781 contains 10% of granules per acre. Http://
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