It's time for the high incidence period of red spiders to do a good job in reducing the pests of red spiders in corn.

Red spider has always been one of the pests harmful to agriculture, which harms not only corn but also cotton, peanuts, fruit trees, flowers and so on. The main harm to corn is that red spiders absorb the juice of corn, resulting in the drying of corn leaves, affecting the growth of corn, resulting in reduced yield and other harm. Next, let's share with you how to scientifically guard against red spiders.

1. The harm of red spiders

Red spiders generally start activities in spring, mainly active in weeds, the reproduction rate is very fast, generally red spiders can reproduce about 20 generations a year. As the weather turns hot and corn grows vigorously, red spiders will transfer from weeds to corn, and groups of red spiders will gather on the back of corn leaves and suck up the sap of corn leaves, causing corn leaves to dry and turn green. In serious cases, it will cause large-scale death of the leaves and seriously affect the yield of corn.

2. The living habits of red spiders

If you want to control red spiders, you need to understand the life habits of red spiders, which is the so-called know yourself and know the enemy, and win a hundred battles. Generally speaking, red spiders began to appear in corn in June, and entered the peak period of corn red spider pests in July. If the humidity is below 70% and the temperature is between 26 and 30 degrees, it is the most suitable environment for red spiders to live and breed. Especially in the northern region, after entering July, high temperature and little rain, red spiders can reproduce a generation in a week or so, causing serious insect pests of corn red spiders. In particular, the planting density of corn is high, when the temperature is high, farmers' awareness of prevention of red spiders is not strong, it is very easy to cause a large area of corn to be harmed by red spiders.

3. Control of red spiders.

Timely cleaning of weeds red spiders are mainly stored in weeds in the early days, at this time the red spiders generally do not have a large-scale outbreak, so usually timely clean up the weeds on the ground and Longshang. Early detection, early prevention and treatment. In the early stage of corn growth, when the corn plant is not very large, check the back of the corn leaves in time and remove and burn the leaves in time after being infected with the red spider.

Pesticide treatment for the occurrence of red spiders in cornfields timely spraying red spiders insecticides, generally choose 1.8% avermectin, 40% acetylene mites 1500-2000 times solution for spraying control. Red spiders mainly gather on the back of corn leaves, so spray the medicine on the back of the leaves.

Natural enemies red spiders also have natural enemies, some beetles, lacewings, ladybugs will prey on red spiders, so do not use broad-spectrum pesticides when spraying pesticides to avoid killing the natural enemies of these red spiders. Or you can catch some of these insects in the fields to reduce the number of red spiders.

In addition, we can also make a reasonable rotation to prevent crop rotation such as corn, peanuts and soybeans, which are more prone to the outbreak of red spiders, and try to plant some crops that are not suitable for the outbreak of red spiders, which can reduce the breeding speed of red spiders. In addition, for some more conditional farmland, smoke control, field fumigation and other methods can be used to reduce red spiders.

The above answers about how to prevent and control the corn outbreak of red spiders come from the original creation of science and agriculture. I hope it will be helpful to you. In particular, it should be reminded that the summer temperature of the corn field is relatively high and the air permeability is poor, so growers must pay attention to their own safety when spraying pesticides.