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Insect Control
Boll Weevil

Boll Weevil, a beetle that eats the buds and young bolls of cotton plants, resulting in damage that reduces the fiber output of the plants. It is a native insect of Mexico and Central America, then migrated into the United States in the late 19th century and had infested all U.S. cotton-growing areas by the 1920s. During the late 20th century it became a serious pest in South America as well.

The early stage of attack is recognizable by a small puncture (either egg or feeding puncture) at the side of the flower bud. The bracteoles subsequently spread out, whilst the buds turn brown in colour and fall off. In later stages, flowers turn a yellow colour and fall to the ground, as do small bolls. Large, punctured bolls usually remain on the plant, but will be of poor quality.

Since 1978, the Boll Weevil Eradication Program is sponsored by the USDA, sought to eradicate the boll weevil in the cotton-growing areas of the United States. It is one of the world's most successful implementations of integrated pest management and was finished by the autumn of 2009. Three main techniques are employed over a 3- to 5-year period: pheromone traps for detection, cultural practices to reduce the weevil’s food supply, and malathion treatments.

Chemical control:
Both larvae and adult of boll weevil make injury to cotton. The larvae feed on bud or boll and the adult feed on cotton leaves. Broad-spectrum insecticides or those with stomach poison for chewing insecticide might be good choice. Profirst suggestion: Lamda-cyhalothrin、cypermethrin、malathion.

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