Chemical control should be implemented during the early stage of corn heading. When there are 4,000 aphids per 100 corn stalks and more than 50% of the stalks are infested, it's time to take action. Several effective insecticides can be used for this purpose. For example, you can apply 10% imidacloprid wettable powder diluted at a ratio of 1,000 times, or 20% Confodic® concentrate diluted at 8,000 times. Another option is 70% Amylolique dispersant diluted between 20,000 to 25,000 times, or 0.36% green plant matrine aqueous solution diluted at 500 times. Alternatively, you may use 10% beta-cypermethrin EC at 2,000 times, 2.5% cyhalothrin at 2,500 times, or 50% cyhalothrin diluted at 2,000 times. It's important to follow the recommended application rates and safety guidelines to ensure both effectiveness and environmental protection. Always wear proper protective equipment when applying chemicals and avoid spraying on windy days. Regular monitoring of the field is also essential to assess the effectiveness of the treatment and decide if further actions are needed.
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