How to prevent and control Bemisia tabaci? Bemisia tabaci can also be called cotton whitefly, sweet potato whitefly, belonging to the family Homoptera, mainly for melons, solanes, beans, potatoes, cruciferous, umbelliferous and other vegetables. It often causes the plants to wilting and die, and at the same time can induce black coal pollution. Therefore, today Xiaobian talks about the comprehensive control measures of the whitefly, and hopes to help everyone.
First, the characteristics of Bemisia tabaci
In the southern region, there are 11 to 15 generations each year, and the overlap of generations is serious. However, the open areas in the north cannot be wintered, but the protected areas can be annihilated. In recent years, the risk of Bemisia tabaci has increased year by year. Adults and nymphs will suck the leaf juice of plants, causing the leaves of the affected plants to chlorotic, and in severe cases, the plants will die. Adults of Bemisia tabaci have phototaxis and tenderness, and most of them lay eggs in the middle and upper leaves of plants, which can adapt to higher temperature environment. When the temperature is 25-30 degrees, it is the most suitable temperature for population development, survival and reproduction of B. tabaci. condition.
Second, the comprehensive control measures of Bemisia tabaci
1. Prevention and treatment strategy: Pay attention to prevention. In the high-incidence season, the prevention and control are carried out in five stages: partition spread, transplanting seedless seedling, yellow plate trapping, environmental regulation and pesticide control.
2, agricultural control: cultivation of insect-free seedlings, control of the initial population of B. tabaci; removal of residual plants and weeds before seedling; covering 40-60 mesh insect nets to prevent adult migration; production rotation and removal of impurities Grass; the harvest should be cleared in time.
3. Physical control: when planting vegetables in greenhouses, it can cover 40-60 mesh insect-proof nets; in the early stage of B. tabaci, 20 pieces of 40 cm × 25 cm yellow attracting sticks are suspended every 667 m2 in the greenhouse; environmental regulation during cultivation It can effectively reduce the number of insect populations; in the changing season, measures such as irrigation, stagnation, smoke killing, etc. can be effectively prevented and controlled.
4. Chemical control: In the early stage of the emergence of B. tabaci, 25% thiamethoxam water dispersible granules (Aktec), Emerald, acetamiprid, 10% chlorothiazolin wettable powder, 22.4% spirotetramat ethyl ester Suspension (muwangte) and other prevention and control; 20% isopropanol smoke agent can be used in the shed, the dosage is 250 g/667 m2. After the work is completed in the evening, the greenhouse is closed, and the smoke agent is divided into several parts for ignition. Smoked.
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