Recently, one of our customers in a greenhouse encountered a problem that he concerned. He said that when the temperature rises, the whitefly has broken out again. You can see dense swarms of whiteflies flying around. But after the use of insecticides, there was almost no effect on whiteflies.
Speaking of whitefly, many feel the same way as him. Why is whitefly a particularly serious problem? When the temperature is high, especially in the greenhouse, and after watering, the humidity in the greenhouse increased and weeds grew inside, which created conditions for whitefly breeding.
The reasons for the difficulties in prevention and control are as follows: the ability of reproduction, short growth cycle of whitefly, coupled with the characteristics of wide range of parasitism, high outbreak prevalence and long harm time. It is hard to completely cure the pest after insect damage, which seriously restricts the yield and quality of vegetables, that can be said to be a very disturbing pest. So how to control whitefly? This article will explain 6 effective methods to control whiteflies!
Six good prevention and control methods
1.Prevention in advance
Most people lack of the corresponding skills in the control and management of insect pests, and they can not combine them well. They often wait until the large area of whitefly occurs before they start to control them, which is often hard to control; In addition, some people are more casual in the use of agrochemicials, can not grasp the key period of prevention and control, which is also an important reason for the poor effect of prevention and treatment.
2.Crop rotation and Eradication of insect sources
In order to prevent whitefly from spreading to the greenhouse, replace the open-air vegetables around the shed with chrysanthemum, spinach, celery, garlic seedlings and other vegetables that whiteflies don’t like but are resistant to low temperatures; The above vegetables can also be intercropped with crops to prevent the spread of whitefly. Before seedling raising or planting, the residual weeds in the base should be cleaned up, and the residual adults should be eliminated by fumigation or spraying.
3.Scientific use of pesticides
On the one hand, it is better to spray in the early morning, after the first use of pesticides, and then the next day, it can kill more whiteflies that fled back; On the other hand, we should focus on spraying the back of leaves to maximize the pesticides effect; Besides, when spraying whitefly agrochemicals, we must alternate the use of pesticides. When using pesticide, we can add some washing powder solution or penetrant, so that the pesticides can better penetrate into the body of whitefly and have a better killing effect
4.Yellow board traps adults whitefly
Adult whiteflies are yellowish, so yellow boards should be hung at the early stage of occurrence. Yellow boards are recommended to be hung on the top of the plant, which is flat or slightly higher, and can increase or decrease depending on the degree of pests. The yellow board can not only trap and kill adults whiteflies, but also monitor the development of insect situation. It can also trap and kill other pests such as aphids, jumping beetles, diamondback moth and so on.
5.Release natural enemies of whiteflies
Square-spotted and red-spotted lip ladybug, lacewing are the natural enemies of whitefly. According to the experiments, one red-spotted lip ladybug can kill 20-30 whitefly, and one lacewing can kill 170 whitefly larvae. Therefore, the appropriate release of the above natural enemies in the initial occurrence area of whitefly has a very good effect on the control of whitefly. Generally, natural enemies can be released once every 10-15 days, and the ratio of natural enemies released is 2:1, and the natural enemies can be released continuously for 3-4 times.
Acetamiprid (20% SP), Imidacloprid (25% SP), Thiamethoxam (25% WDG) and Methomyl (90% SP) were used to control whitefly. The best pesticides for adults whitefly are 70%Imidacloprid, 10%Nitenpyram, 22.4%Spirotetramat and 25% Thiamethoxam. The pesticides with good eggs killing effect are: 10% Pyriproxyfen, 22.4% Spirotetramat, 25% Buprofezin, etc. It is suggested that it can be used in combination with adult insecticides to control the number of pests fundamentally and keep effective for a long time. It is recommended to use Thiamethoxam60%+Dinotefuran20% WDG will have the most significant effect. The product can produce high synergy, overcome and delay the resistance to insecticides, with fast killing speed, long working time, and reduce the cost of pesticides. It is used to control Hemiptera and Coleoptera resistant pests on crops, especially to control whitefly and planthopper, and its effect is obviously higher than that of single-agent. And it is better to combine physical and chemical control methods to reduce the spread of pests and control the occurrence of virus diseases. In order to control pests better, we should not only choose the right pesticide, but also master the correct method of use.
In a word, the prevention and control of thrips need to be based on the characteristics of thrips that tend to be blue and afraid of light, combined with the use of agricultural drugs.Additionaly, Not only change the maintenance of the environment,but also usually strengthen ventilation, to avoid aggravating the phenomenon of insect pests.