Recently, most of the cotton fields in the coastal areas and along the Yangtze River region have been seriously affected, causing the cotton leaves to fall yellow and falling off, which seriously affects the growth of the bolls. According to the occurrence of blind observance, what measures should be taken to prevent it?
There are more occurrences of L. obliquus in the L. lucidum and C. japonica, and the occurrence of the L. infestation is generally 7-10 days earlier than that in the C. japonica. In addition to the harm caused by the damage of the budding bell, the green-lipped stink bug also sucks the head buds and young leaves of the tender buds to produce small black spots. After the lesions expand, holes are formed and the top leaves become incomplete. This is known as “breaking head madnessâ€; The major harm to reproductive organs, especially in the flowering and bolling period, is far more harmful to young bells than green-lover animals.
The second half of June is the peak of the harm of the second generation of blind stink bugs. The main reason for this situation is: Since the Meiyu period, rainy days and heavy rains prevented farmers from applying medicines in fields and missed the appropriate period of prevention and control of the second generation of blind stink bugs. As a result, the amount of insects after the second-generation blind pheasant enters the tail peak remains large. According to the survey, in some areas, there are about 100 strains of insects in cotton fields, and 10 to 20 strains of damaged plants are added in 100 strains. Due to the large amount of tail-flyworms in the second generation of blind tadpoles, coupled with more rainy days in the near future, the third-generation blind tadpoles generally occur in the late July 15th, with a moderate degree of occurrence.
In view of the large amount of second-generation tailfly insects in the cotton-lipped foal, the next step is to focus on the prevention and control of the three-generation blind cicadas. Master the use of cotton nymph nymph 2 to 3 years of age, continuous control 2 to 3 times. Jiangsu began to control around July 10, the first use of drugs in the July 10 to 15, focusing on the prevention and treatment of the green-lipped iguana; interval 7 to 10 days after the second medication, focusing on prevention and control of the black-claw elephant; after two medications Afterwards, it is decided whether or not to use the third medicine according to the amount of residual insects in the field. Generally in the July 27 to 28 combined prevention and control of the three generations of blind taro elephant peaks, and corn borer and cotton bollworm and other pests. 40% of chlorpyrifos emulsifiable concentrate 500 times, 50% of malathion EC 1000 times, 40% of omethoate EC 1500-2000 times, 40% of phoxim EC 1000 times, etc. can be used. The chlorpyrifos has a fast-acting effect, a long effective period, and a good control effect. The drug is commonly used in production.
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