Control methods of Cucumber whitefly

Bemisia Tabaci is a kind of pest that harms cucumber. It will fade, turn yellow and wilt when the cucumber leaves are removed, and the plant will die when it is serious. So farmers should do a good job in the prevention and control of cucumber whitefly. Let's take a look at the control technology of whitefly with Xiaobian.

1. Habitual symptoms

The adults of whitefly have a strong tendency to yellow, but avoid white and silver, which first occur a little in the field, and then spread gradually, the population density in the field is evenly distributed, and the adults like to gather on the back of the tender leaves of the upper part of the plant and lay eggs on it. It's not easy to fall off. With the growth of the plant, the adults continue to transfer to the upper leaves, so there are certain rules: the uppermost young leaves are the adults and the first yellowish eggs are the most, and the lower leaves are mostly dark brown eggs. then the lower part is the first instar nymph, the old nymph and the pupa. Adults and nymphs gather on the back of the leaves and suck the sap of the leaves, resulting in chlorosis and wilting of the leaves, malformations and rigidity of the fruits, and premature senescence of the plants. In addition, it will secrete a large amount of honey, resulting in leaf and fruit pollution, often causing a large area of coal pollution.

2. Agricultural prevention and control

The previous crop should plant vegetables that Bemisia Tabaci do not like to eat, such as celery, garlic and other low-temperature-tolerant vegetables, so as to reduce the source of insects. At the same time, cultivate disease-free seedlings, separate the seedling land from the planting land, smoke and kill insects before sowing, remove disease residues and weeds, and set up insect avoidance nets at the vents to avoid the invasion of external insect sources. In addition, aphid wasps, the natural enemy of whitefly, can be artificially propagated in the greenhouse, which can also effectively control whitefly.

3. Physical prevention and control

White whitefly has a yellowing tendency, so it can set up a yellow board in the greenhouse to trap and kill adults, use a yellow board of appropriate size, apply yellow paint, and then apply a layer of engine oil on it. Generally, 30-40 yuan per mu can be set, and it should be repainted every 7-10 days, which can effectively control the adults of whitefly and inhibit its reproduction.

4. Chemical control

Bemisia Tabaci has the characteristics of small individual, large number, rapid reproduction and wide harm, once it occurs, it is extremely difficult to control, so it is necessary to inspect frequently, give priority to prevention, and uninterrupted continuous control in order to achieve good results. At the initial stage of occurrence, frequent inspection can be used to give priority to prevention, and at the same time, continuous prevention and control should be carried out continuously in order to achieve good results. It can be sprayed with chlorpromazine, mites and aphids, generally every 5-7 days, 2-3 times in a row. You can also smoke with dichlorvos, pour dichlorvos on the wheat straw pile scattered in different parts of the greenhouse, ignite the shed for one night.

The above is the introduction of cucumber whitefly control methods, hope to help you, want to know more related knowledge, please pay attention to us.