When growing cabbage, why are green worms the most difficult to control?

When planting cabbage in autumn, the problem depends on the prevention and control of pests and diseases in the early stage, biting the leaves and roots, the occurrence of insect holes, yellowing and even seedlings, endangering the healthy growth of cabbage, giving the middle and late stage of soft rot and the opportunity to promote the production of heart. Therefore, the control of cabbage pests and diseases is very important. Many farmers have reported that when they prevent moths and insects, the effect of spraying is getting worse and worse, and when they saw insects eaten before, they would be good to use the medicine once in two or three days, as long as there are no insects in the field.

Since the cabbage is grown, many farmers are worried about being bitten by insects, and although they have the best equipment like insecticides, it will also be difficult to control pests and diseases. For example, in the control of cabbage worms, some farmers have the wrong idea of using medicine, and at the same time, the resistance of cabbage worms is improved, which in turn affects the control effect.

The best prevention and control stage has been missed

In vegetables, insect pests breed faster, and many farmers habitually apply pesticides when they see insects. The best time to control cabbage worms is before the egging maturity period to the second instar of the larvae, and the effect of spraying is very good. Some farmers apply pesticides after the third instar, when there are wormholes on the leaves or when only the petiole is left in the bite.

Or in the first spray, the wrong agent is used, resulting in the longer the pest infestation, the greater the difficulty of control. If the insect pest resistance can be grasped and the control is early, the actual effect of control can also be improved and the cost of control can be reduced. The resistance of cabbage seedlings is small, and it is generally necessary to gradually spray pesticides to prevent moths in the whole process of replenishing seedlings and budding periods.

If the cabbage worm enters the heart lobe until after balling, the control effect becomes weaker.

Increase the amount of a certain type of drug

The cabbage worm is also resistant, and some farmers often use the same ingredient when spraying, and the resistance of the cabbage worm will be improved, and it is useless after the fight. Farmers will mistakenly think that the more frequent the spraying, the greater the amount of pesticides used, and the better the actual effect of moth prevention. In that way, it will not consume the cost of spraying again and again, and drug damage will continue to occur.

The agents used to control cabbage worms include emamectin benzoate, chlorantraniliprole, indoxacarb, cypermethrin, etc., which are commonly used. Pyrethroid insecticides are more resistant and can be sprayed with other agents. Due to the different varieties of pesticides, the basic principles of insect control are also different, and when the application is replaced or combined, the resistance of insect pests can be reduced to improve the control effect.

For example, after some applications of emamectin benzoate to cause resistance, the combination of emamectin benzoate and indoxacarb is used, and the effect is very good and the effect is long.

In the prevention and control of cabbage insects, we must pay attention to the above two problems, grasp the best control period before the second instar of the larvae, and do not mistakenly think that when there are more insect pests, the medicine can be prevented and controlled. In the application of the drug, do not use a single agent, scientific research on the use of drugs, to maintain the effect of the drug.

Because there are generally some small insect eggs, there is no way to prevent them at this time, and there are generally a lot of small insect eggs, so it will cause such an impact.

It is because this insect has a strong resistance to drugs and survives more secretively, so it will lead to this situation and reproduce very quickly.

Because this animal is very adaptable, when this animal was discovered, this animal had already multiplied a lot, and the ** time was missed.

Because this animal reproduces very quickly, and this animal is very difficult to find, when it is found, it has already lost its chance.

If you want to control cabbage insects, you should use pesticides to prevent and control Chinese cabbage. In addition, it is necessary to breed excellent varieties, pay attention to reasonable field management, effective watering and fertilization.

Generally speaking, the method of spraying the plant ash leaching solution can effectively control the cabbage insect, especially the method of spraying the plant ash leaching solution can effectively help vegetable farmers kill the eggs of the cabbage worm, and minimize the damage of the cabbage worm to a certain extent.

You can use plant ash, so that you can better control it, and you can spray some pesticides, which can also better solve the problem.

You can choose to spray some pesticides appropriately in the process of cabbage growth, or you can choose to use biological control to water in time, do a good job in field management, remove the surrounding dead branches and weeds, and apply base fertilizer. In the process of cabbage planting, soil and pesticides should be mixed and mixed to plant, so as to prevent the occurrence of cabbage insects.

First of all, I think that it can trap and kill adult insects to reduce the production of eggs, and pesticides can also be used to eliminate pests; With proper light, the right amount of watering, the right choice of fertilizers, regular deworming, it is possible to grow other vegetables at intervals between the cabbage.

Because cabbage insects are phototaxis, black light can be used to kill cabbage insects. You can choose Chinese cabbage varieties with high resistance to pests and diseases and a reasonable crop rotation, and choose to plant vegetables such as tomatoes and beans after planting.