Bemisia tabaci has a wide range of hosts, strong reproductive capacity and long hazard period. It not only sucks plant juice to cause poor growth, but also spreads a variety of viral diseases, affecting crop yield and quality. The results of many years of experiments and demonstrations show that the good control of the “three customs†and the prevention and control of the gates can not only effectively control the seasonal hazards of the tobacco meal in the greenhouses of the facility, but also greatly reduce the pressure of prevention and control in the later period, especially in the summer and autumn. Pressure to improve the overall control effect of B. tabaci.
First, catch the autumn seedlings into the shed. Bemisia tabaci cannot be wintered in greenhouses with poor exposure and poor insulation conditions in most parts of Jiangsu. Therefore, the amount of insects that overwinter in solar greenhouses and double-layer greenhouses is the main source of insects in the coming year. Grasping the insect-free seedlings or the few insects into the shed is an important measure to control the whitefly in the winter spring shed. Three points should be paid attention to during the transplanting period: one is to use the 50 mesh insect net to block, the insect net is covered in the nursery, the insect net is blocked by the inlet and outlet of the greenhouse, and the insect net is not blocked in the production greenhouse to prevent the planting on the plant. Tobacco meal was transferred to the seedlings for breeding hazards; the third was to cure the vegetable seedlings and tobacco powder before entering the shed, so as to carry the medicine transplant.
The second is to grasp the base of winter and spring. Control has entered the population and hazards of Bemisia tabaci in the greenhouse. In winter and early spring, the amount of worms in the sheds is low. Through the green prevention and control measures such as agriculture, physics and biological control, the hazards can be controlled, and the base can be effectively reduced, and the summer and autumn prevention and control pressure can be alleviated. First, the yellow plate is suspended in the shed. Using the phototaxis of Bemisia tabaci at 410 nm wavelength, the yellow viscose board was used to trap the adult. The hanging density is 20-30 pieces per acre, and the hanging height is 10-15 cm above the canopy of the plant, which is increased with the growth of the plant. The second is to plant traps and repel plants. The use of Bemisia tabaci for the preference of ramie and grammatical grass, where there are conditions, a row of ramie or sylvestris can be planted in the shed to trap the adult larvae to lay eggs, centralized control or eradication in the late spring and early summer; Planting ramie or onion around the greenhouse to control the transfer of tobacco powder to the shed. The third is to remove the old leaves. The main leaves of the lower part of the vegetable are concentrated on the main eggs, nymphs and mites. According to Dongtai Plant Protection Station, when the pepper plants reached 12 leaves, the number of eggs in the lower 4 leaves reached more than 85% of the whole plant. Combining agronomic measures to remove the lower old leaves can effectively reduce eggs. The fourth is to release natural enemies. When the amount of tobacco mites in the winter shed is low, the artificial release of the larvae or the horned bee control insects.
The third is to prevent the proliferation of the early summer. At the beginning of summer, the temperature rose rapidly, and the amount of insects in the shed was higher after several generations of sheds. It is an important measure to control the population of Bemisia tabaci in summer and autumn. It is necessary to make full use of the favorable conditions for the closure of the shed and do a good job of prevention and control in the shed. Use 1.8% avermectin EC 1,500 times solution or 25% buprofezin WP 1,000 times solution or 25% thiamethoxam water dispersible granule 2,000 times solution or 50% nitenpyram water dispersion before uncovering the film. Granules 2,000 times solution or 25% pymetrozine wettable powder 2,000 times evenly sprayed, the second time between 5 and 7 days, pay attention to rotation and safe interval.
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