Translucent membranous "intestinal holes" and irregular long holes will appear on the corn leaves of Spodoptera exigua in grassland, or the whole corn leaves will be eaten up, and the growing point of corn may die in severe cases. This kind of pest eats a lot, especially in the old age, so even if it eats a piece of land, it will migrate in groups to the surrounding crops to continue to suffer, and the loss is particularly serious. The reason why Spodoptera exigua is very harmful on the grassland is that Spodoptera exigua has strong fecundity on the grassland. Under normal circumstances, a female moth can lay nearly 2000 eggs. Moreover, the grassland has strong growth ability to Noctuidae and can survive normally in various environments. But also can be parasitic, and the parasitic range is very wide. It can be parasitic not only on corn, but also on rice, millet and other food crops. Weeds can also grow, and most importantly, they have the ability to fly and spread very fast, expanding the affected area.

It is very resistant to various pesticides, and the control effect of various pyrethroids is not obvious. Moreover, because the meadow moth is an exotic species in China and China has no natural enemies, it grows rapidly. Moreover, Spodoptera exigua is a pest in the United States, so it is very common on corn. Therefore, local residents often use pesticides, which will naturally produce a large number of antibodies to Noctuidae on the grassland. So after the invasion of China, the antibody itself was carried, and naturally many pesticides failed. Control methods of Spodoptera exigua in grassland.

Grassland borer is an invasive species, and effective pesticides can not be put into China at present. However, on the natural grassland, after the outbreak of Noctuidae diseases, all parts of China entered the emergency prevention and control work. Agricultural parks are also screening common pesticides in China. First, choose pesticides with good control effect and low toxicity from these pesticides. To some extent, it can prevent meadow moth, inhibit reproduction and reduce the number. Avoid causing more harm. Strong reproductive ability

The tolerant meadow moth has antibodies to many pesticides, and the control effect of many pyrethroids is not obvious. Moreover, because the meadow moth is an exotic species in China and China has no natural enemies, it grows rapidly. Moreover, Spodoptera exigua is a pest in the United States, so it is very common on corn. Therefore, local residents often use pesticides, which will naturally produce a large number of antibodies to Noctuidae on the grassland. So after the invasion of China, the antibody itself was carried, and naturally many pesticides failed. Control methods of Spodoptera exigua in grassland.

Grassland borer is an invasive species, and effective pesticides can not be put into China at present. However, on the natural grassland, after the outbreak of Noctuidae diseases, all parts of China entered the emergency prevention and control work. Agricultural parks are also screening common pesticides in China. First, choose pesticides with good control effect and low toxicity from these pesticides. To some extent, it can prevent meadow moth, inhibit reproduction and reduce the number. Avoid causing more harm.