The greenhouse whitefly, also known as the white moth, is one of the major pests in greenhouses in Beijing. The host is cucumbers, tomatoes, beans, peppers, and zucchini. Greenhouse whitefly is widespread in Beijing and is seriously endangered. Because the individuals of greenhouse whitefly are very small, it is not easy for growers to pay enough attention; its reproductive ability is very strong, and once the damage is very serious, it is difficult to eradicate in the greenhouse in winter, and the control of whitefly using a single prevention and treatment measures is effective. Micro, seriously affect the yield and quality of vegetables. It is recommended that growers adopt comprehensive prevention and control technologies to prevent and control greenhouse whitefly. ■Injury symptoms In the greenhouse, whitefly pollinated with nymphs and adults concentrated on the back of the host's leaves to make the leaves fade, yellow, and wilted, and the whole plant died when it was severe. When nymphs and adult pests are harmed, they can secrete a lot of honeydew, contaminate the leaves and fruit surface, induce coal pollution, affect the photosynthesis of the crops, cause premature death of leaves, and death; in addition, the greenhouse whitefly can also spread viral disease, once the virus disease occurs Difficult to control, seriously affecting crop yields and commodity quality. ■Prevention measures Cultivation measures. Cultivation of insect-free seedlings: Nursery greenhouses are separated from production sheds. Residues, weeds, and stubbles are removed from nursery sheds, and the nursery sheds are covered with insecticides to cover insecticide nets. Reasonable planting: Avoid cucumbers, tomatoes, beans and other mixed plants, and the greenhouse whitefly does not like to eat celery, leeks and other crop rotation. Reasonable irrigation: Use drip irrigation or under-membrane irrigation to reduce the humidity in the greenhouse. Physical control. The upper and lower air outlets of the greenhouse were installed with insect-proof nets to prevent pests from intruding; 20 cm yellow plates of 30 cm and 40 cm were hung in each shed to trap and kill. Biological control. In the initial stage of colonization and when the amount of greenhouse whitefly reached 0.5-1/plant, the preventive release of the citron was conducted for prevention and control; 2,000 heads/mu was released every 7 days for 5 consecutive uses. The larva was able to establish a population successfully. Control the damage of whitefly. Chemical control. Conventional spray: 99% mineral oil diluted 200 times with water, 10% imidacloprid wettable powder 1500 times, or 10% acetamiprid 1500 times, or multi molecular target technology product 25% golden ostrich 1500 times. Spray evenly and spray it for a second time after 7 days. Chemical fumigation: When the humidity in the greenhouse is high, use 10% Isoprocarb for 300g/mu each time, once every 7 days, once every 2-3 times. The use of alternatives for the prevention and control of the use of agents is better ■Precautions The release of the licorice wasp to ensure the confinement of the greenhouse, the greenhouse temperature should be maintained at 15 °C -35 °C, humidity 60% -85%, the use of pesticides throughout the process, to avoid the destruction of natural enemies. The spraying time is best to avoid the high temperature period at noon, and evenly spray the surface, foliage, and leaves to improve the control effect. Safety precautions should be taken when spraying to avoid poisoning. X-Ray Baggage Scanner,Airport Bag Scanners,X Ray Scanner Baggage,Airport Luggage X Ray Shenzhen Unisec Technology Co.,ltd , https://www.uniqscansecurity.com
Early detection of greenhouse vegetable whitefly