The scientific name Bemisia tabaci (Gennadius) belongs to the order Homoptera, Acipenseridae. Synonyms Gossypiperda Misra, B. 10 ngispina Preisner et Hosny. is distributed in China, Japan, Malaysia, India, Africa, North America and other countries. Host cotton, tobacco, tomato, sweet potato, cassava, cruciferous, Cucurbitaceae, leguminous, Solanaceae, Malvaceae and so on. Injury characteristics, nymphs sucking plant juices, wilting or wilting of dead leaves. Morphological characteristics Adult body length 1mm, white, wing transparent white fine powder. The length is 0.55 to 0.77mm, and the width is 0.36 to 0.53mm. Less back bristles, 4 pairs, less wax back holes. The head has a rounded edge and is more deeply curved. The chest valve folds are not obvious, with 2-5 coracoid processes in the back center. The back abdomen has 8 papillary protrusions. The micro-wrinkles in the lateral dorsal area were not wide, and the tail ridges changed significantly. The size of the bottle-shaped hole was 0.05-0.090.03-0.04 (mm), and the length of the labial-tongue tongue was 0.02-0.050.02-0.03 (mm). Cover flap nearly round. Tail ditch 0.03-0.06mm.
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Habitat Subtropical generation 10 to 12 overlapping generations, almost monthly occurrence of a population peak, 15-40 days per generation, summer egg period 3 days, winter 33 days. The nymphs are 3rd instar, 9-84 days old and 2-8 days old. Adult spawning period is 2-18 days. Each female produces about 120 eggs. Eggs are prolific in the middle leaves of the plants. Adults like to have no wind and warm weather, have yellowing, the temperature stops below 12°C and stops development, the eggs begin to lay at 14.5°C, the temperature is 2l to 33°C, and the temperature increases, the fecundity increases, and the adult mortality is higher than 40°C. . Relative humidity less than 60% of adults stop spawning or die. Storms can inhibit their occurrence. Crops that are not in irrigation areas or with a small number of waterings are heavy.
Control methods (1) When breeding seedlings without insects, separate the seedbed from the production greenhouse, thoroughly sterilize the seedlings before the seedlings, and clean the seedlings with insects before planting so that the cotton seedlings used for planting are free of insects. (2) Using citrifolia bumblebees to control Bemisia tabaci, when each strain of cotton has 0.5-1 head, each bee is given 3 to 5 heads, and 10 to 1 day, and continuous bee 3-4 times. Basic control of its damage. (3) Pay attention to arranging and arranging in a greenhouse and a greenhouse, cucumber, tomato, eggplant, pepper, beans, etc. Do not mix, conditional interplanting with celery, leeks, garlic, garlic, etc., to prevent acaroid mites Spread. (4) In the early stage of the infection, the sputum began to be sprayed with 20% fluocin WP 1500 times or 25% chlorpyrifos 1000 times, 2.5% Uranus EC 3000-4000 times, 2.5 times %Karythrin Emulsion 2000-3000 times solution, 20% Scandex EC 2000 times, 10% imidacloprid WP 1500 times, once every 10 days, continuous control 2-3 times. (5) The whitefly in the shed can be smoked by a backpack or a mobile smoker. The use of this method must strictly control the amount of medication to avoid phytotoxicity. (6) The cassava cuttings from the tropics, various islands in Africa and India must be disinfested to prevent the spread of the insects.
