At present, the season has entered the autumn, most of the vegetables have begun to use greenhouses or greenhouse cultivation, and at this time, the hazard of whitefly will be gradually increased due to vegetable cultivation. Affect the greenhouse vegetables to varying degrees.
The greenhouse whitefly, also known as the greenhouse mealworm, is a Homoptera, a whitefly. Whitefly mainly damages melons, legumes, and solanaceous vegetables in the greenhouse. Adults and nymphs cluster on the back of leaves to absorb plant sap, causing the leaves to turn green and yellow, wilting or even dead, affecting the normal growth and development of the crop. At the same time, a large amount of honeydew secreted by adults accumulates on the foliage and fruits, causing the occurrence of coal pollution, severely affecting photosynthesis and respiration, and reducing the yield and quality of crops. In addition, the worm can also spread certain viral diseases. Experts remind that it is time to control whitefly.
I. Agricultural control
1, no insect breeding seedlings. Greenhouse and seedlings were disinfected before planting. Per acre of greenhouse with 80% dichlorvos 0.4-0.6 kg smoked, or with 10% imidacloprid EC 1000 times spray.
2, a reasonable layout. In the open field near the shed, it is wise to avoid colonization of whiteflies such as melons, solanaceous vegetables, and legumes, and to cause serious vegetables, and to promote the cultivation of cruciferous vegetables that do not prefer to eat whitefly to reduce the source of insects. In the first place of the greenhouse, it is best to plant low temperature resistant vegetables such as celery, rapeseed, leeks, spinach, cilantro, etc. that do not like to eat whitefly, and reduce the planting area of ​​cucumbers and tomatoes. Indoor greenhouses to avoid cucumbers, tomatoes, beans and other mixed plants to prevent the whiteflies from spreading to each other, increase the harm and increase the difficulty of prevention.
3. Nylon yarn is sealed at the vent of the booth to control the alien insects. When pests occur, they combine pruning, removing old leaves with pests, and burying or burning out of the shed.
Second, physical control
Whitefly has a strong tendency towards yellow color. In the early stage of the whitefly occurrence, yellow plates can be trapped to kill adults. Place 30 pieces per acre and place them between the rows to make them equal to the height of the plants. At the same time, in the greenhouse vegetable production process, as long as the temperature outside the shed is suitable for whitefly survival, an insect net should be added to prevent the whitefly from entering the shed. Inside.
Third, biological control
When the amount of whitefly occurrence in the shed is 0.5-1/plant, it can release the “Black Stork†of the larva, each 3-5 heads, and release it once every 10 days, releasing 3- 4 times, the parasitic rate can reach more than 75%, and the control of whitefly is better.
Fourth, chemical control
1. The smog method uses 22% of dichlorvos smoke agent 0.5 kg per mu of greenhouse and closes shed smoke in the evening; or 80% of dichlorvos emulsifiable concentrate 0.4-0.5 kg per mu, poured on sawdust and other carriers, plus a few burning Red briquettes smoke smoke.
2. The spray method can be used 10% Buprofim EC 1000 times, or 10% Versatrol WP 1000 times, or 2.5% Kung Fu EC 3000 times, or 20% chlorim EC 2000 times or 80% Dichlorvos EC 1000 times, spraying once every 5-7 days, continuous medication 3-4 times.
Due to the overlap of whiteflies generations, there are various species of insects on the same crop at the same time, and the currently used agents are not suitable for all forms of insects. Therefore, in the prevention and control of pharmaceuticals, they must be used several times or alternately in order to obtain Good control effect.
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