The whitefly has a very wide range of mistletoes and it is mainly harmful to cucumber, bean, tomato, eggplant, sweet pepper and cabbage cabbage vegetables.
The whitefly adults and nymphs of the greenhouse were mainly clustered on the back of the leaves of the vegetables and sucked the plant sap with sucking and sucking mouthparts. The damaged leaves were chlorotic and yellow, the plants grew weak, wilted, and even the whole plant died. It can also secrete a lot of honeydew to contaminate the leaves and fruits and cause moldy disease.
Greenhouse whitefly can occur in the greenhouses of northern China for 6-10 generations a year. Winter can not be overwintered outdoors. In greenhouses, generations overlap each other to overwinter or continue to harm greenhouse vegetables. The number of its population continued to increase from spring to autumn, and adverse climatic inhibition was not significant. The optimum temperature for adult activities of whitefly is 22-30°C, and optimum temperature for breeding is 18-21°C. It takes 25 days from egg to adult at 24°C.
Whitefly breeding fast, parasitic, easy to spread, we must take a large area of ​​joint prevention and control in order to receive good results.
(1) Cultivating “no insects†When seedlings are nursed, the nursery houses are separated from the production greenhouses. Before the seedlings are raised, the remaining insects are completely smoked and the weeds and stubs are cleaned. As well as sealing the nylon sand in the vents, control alien pests.
(2) Reasonably arrange the layout of vegetable plots and nearby plots to avoid mixing of cucumbers, tomatoes, eggplants, and beans. Advocate the first time in autumn and winter greenhouse planting celery, rape, leeks and other whitefly do not like to eat more low-temperature-resistant vegetables, making whitefly difficult to winter.
(3) Chemical control Due to overlapping generations of whiteflies, there are various forms of insects at the same time. However, current types of agents that are effective for all forms of insects must be administered several times in succession. The use of 10% Buprofen EC 1000 times solution has special effects on whiteflies. The 2.5% extermination of leech oil 1000 times is effective for adults, nymphs and eggs. 21% can also be used to kill quail EC 4,000 times, 2.5% Uranus EC 4000 times, 2.5% Kung Fu EC 5,000 times, and 20% SCREEN 2000 times.
(4) Yellow plate seduce and use waste fiberboard or cardboard, cut into 1m 0.2m strips. Apply the paint to orange peel and coat with a layer of sticky oil (oil No.10 and a little butter). Usually recoating 7-10 days, 32-34 pieces per acre, placed in the same height between the rows. .
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