The whitefly mites in the greenhouse of the pepper will cause the leaves of the pepper to gradually wilting until death, polluting the leaves and fruits of the pepper, affecting the growth of the pepper.
Chili greenhouse white powder mites symptoms:
The greenhouse whitefly is a homoptera, whitefly family. Greenhouse whitefly is a very common pest in protected cultivation and can kill almost all vegetables.
Chili greenhouse white powder mites disease pathogen:
In the greenhouse, adults and nymphs suck on plant sap, and the leaves are chlorotic, yellow, wilting, and even the whole plant is dead. In addition, a large amount of honeydew can be secreted, polluting leaves and fruits, leading to the occurrence of coal pollution, resulting in reduced production and reduced vegetable commodity value. Whitefly can also spread viral diseases. Under greenhouse conditions, more than 10 generations can occur each year , and each insect state will overwinter in the greenhouse and continue to be harmful. Adults like cucumbers, eggplants, tomatoes, kidney beans and other vegetables, living in the leaves and spawning of young leaves. Before the topping of host plants, adults always chase the top and young leaves with the growth of the plants, so they are on the crops. The distribution of white mites is: new green eggs, blackened eggs, young nymphs, old nymphs, pseudo sputum. The eggs of the newly emerged adult worms are inserted into the leaf tissue from the stomata by the egg stalk, and maintain water balance with the host plant, which is extremely difficult to fall off. The nymph can travel a short distance in the back of the leaf within 3 days after hatching , and when the mouth is inserted into the leaf tissue, it loses the function of crawling and begins to camp.
Pathway and disease conditions of whitefly mites in greenhouse
Greenhouse whitefly can not survive in the winter field conditions in northern China, and usually continues to breed on greenhouse crops without diapause or dormancy. In the second year, when it is transplanted by vegetable seedlings, it will be transferred to a greenhouse or open field, or moved to the open field when the greenhouse is opened for ventilation. Therefore, the spread of whitefly in the occurrence of areas, human factors play an important role. The population of whitefly is continuously developed from spring to autumn. The inhibition of high temperature and rain in summer is not obvious. The number reaches the peak in autumn, and it is concentrated on melons, beans and solanaceous vegetables. In the north, due to the close connection and alternating of greenhouse and open vegetable production, the anniversary of the whitefly can occur. In July and August , the density of insect population was relatively high, and it was seriously damaged between August and September . After the end of October , the temperature dropped, the number of insects gradually decreased, and it began to migrate to the greenhouse or overwinter.
Control method of white powder mites in hot pepper greenhouse:
Physical control. Yellow strong effect on whitefly adults trap provided yellow plate (1m × 0.17m) fiberboard or cardboard, painted in orange, and then coated with a layer of oil in the ground within the greenhouse, mu 32--34 block effect trap the adult Significant. Yellow plate disposed between the lines and the height of plant level, accounting millet oil (No. 10 oil is generally used to add a little butter and mix thoroughly) 7 - 10 days recoating time, to prevent droplets caused by burns on plants. As one of the comprehensive prevention measures, this method can be used in coordination with the release of the larvae.
Prevention and treatment occurs early in the field, can be used for prevention and treatment of the following pesticides: 240g / L spirotetramat suspending 4000--5000 times; 10% nitenpyram agent 3000--5000 times; 10% flonicamid Water dispersible granule 3000 - 4000 times liquid; 25 % imipenem zhongdingwei emulsifiable oil 2000 - 3000 times liquid; 22 % thiamethoxazole / high chlorofluoride suspension agent 2000 - 3000 times liquid; 10 % imidacloprid wettable powder 1500 times liquid ; 10% WP imidaclothiz 1000--2000 times; 20% high-chloro-thiazin-one EC 1000--1500 times; 10% propan-pyrazol imidacloprid suspension 1000--1500 times; 25% thiamethoxam can wettable powder 2000 times; uniform spray of water, because of overlapping generations, to continuous control, as the insect spacer 1 about 7 days, the choice of bifenthrin of 2.5% and 25% EC 3000 times serious pests when thiophene Nitrozine wettable powder 2000 times liquid mixed spray control. Selection smoke within 10% fenvalerate protected, with 22% or 0.5kg per acre or fear dichlorvos Smoke Smoke 200 with 15% Imidacloprid enemy - 400g / mu cast using a knapsack motorized smoke smoke generator The effect is also very good. Or use 80 % dichlorvos EC with water in a ratio of 1:1 and heat fumigation.
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