In recent years, cotton mealworms, which have not had much impact on cotton production in the past, have risen to become one of the major pests in many cotton areas. Cotton mealworms are also known as whitefly and whitefly. According to the latest research results of the Institute of Plant Protection of the Chinese Academy of Agricultural Sciences, Bemisia tabaci, which is harmful to dozens of important economic crops such as cotton, vegetables, and tobacco in China, was originally a type B Bemisia tabaci originating in the Mediterranean-Asia Minor region. By the international scientific and technological community as a "super pest." It was introduced into China through the transportation of plants such as poinsettia, and there was an "asymmetrical mating interaction" between indigenous and indigenous whiteflies. This promoted the dramatic increase in the number of B-type whiteflies and inhibited indigenous populations of Bemisia tabaci. The breeding, and to replace the less harmful indigenous whitefly, resulting in the outbreak and harm of tobacco whitefly in recent years.
Adults and nymphs of cotton mealybugs can harm cotton, especially the nymphs. Adult body and wings have waxy white powder. The nymphs are 5 years old and the 1st instar nymphs can crawl. The nymphs of other ages are fixed on the back of the leaves. The larvae occurred about 10 generations in 1 year. In May, cotton seedlings began to enter cotton fields, and the most suitable temperature was 20 to 30°C. From August to September, it was the peak of damage. At the beginning, there was only a small amount of damage on the back of the upper leaves of the cotton plants. The upper and lower leaves of the cotton plants were damaged in a matter of days. The lower part of the leaves had fewer insects, and the upper leaves had 50 to 60 heads of adult and nymphs. 2,000 to 3,000 heads and 4000 to 5,000 heads. After the juice of the victim's leaf is sucked, faded spots or reddish-brown spots appear on the leaf surface, and the leaf margins and the entire leaves and growing points gradually shrink and scorch, resulting in a large amount of shedding of bells, reducing the boll weight, and reducing the yield by 5% to 30. %. Suggested prevention methods are as follows:
First of all, we must understand the harmfulness of cotton mealybugs. Relevant departments should promptly provide yellow alert for cotton mealworms; grass-roots agricultural technicians and the majority of cotton farmers should strengthen their alertness against cotton mealworms, and realize that they have serious challenges to cotton production; they must organize early-stage motorized sprayers for farmers. Re-issued cotton fields for group defense, and other light-haired cotton fields also had to be prevented early.
Second, we must thoroughly purify the surrounding environment of cotton fields. Although the blizzards in winter and spring have a certain inhibitory effect on cotton mealybugs, the vegetable greenhouses near the cotton fields are conducive to hiding in cotton mealybugs. Therefore, it is necessary to thoroughly clean the remaining branches in the vegetable greenhouses and remove the weeds from the cotton fields to minimize the risk. Insect source.
Third, rapid chemical control. Available 3% Royal Dan wettable powder 60 grams per acre, or 3% Qi Qiao EC 50 ml per acre, respectively, 15 to 30 kilograms of water spray; also available silver finches (3% acetamiprid wettable powder) 1000 ~ 2000 times, or 20% acetamiprid wettable powder 1500 times and 1.8% abamectin EC 3000 times mixed spray. At the beginning of the worm, it was sprayed with 25% Buprofimone EC 1000 times.
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