Corn, as one of the world's important food crops, has a direct impact on the lives of many people due to its yield and quality. However, corn is often threatened by various pests and diseases during its growth, among which corn borer is the most common and serious one.
First, the harm of corn borer.
Corn borer mainly harms corn in the larval stage. After hatching, the larvae will burrow into the corn stalk and eat the stem tissue, causing the stalk to break or lodging, seriously affecting the normal growth of the corn. In addition, corn borer larvae will also eat corn leaves and male ears, resulting in yellowing of leaves and degradation of male ears, which in turn affects the photosynthesis and pollination and fertilization process of corn, and ultimately leads to the reduction of corn yield and quality.
Second, the occurrence law of corn borer.
The occurrence of corn borer is closely related to climate, variety, cultivation management and other factors. In general, a climate with high temperatures and rainfall is conducive to the occurrence of corn borer. In addition, the resistance of different varieties of corn to corn borer also varies. In terms of cultivation management, the occurrence of corn borer under continuous cropping and dense planting conditions was more serious. Therefore, when planting maize, varieties with strong resistance should be selected, and reasonable cultivation and management measures should be taken to reduce the probability of corn borer.
3. Prevention and control methods of corn borer.
Agricultural control: Reasonable crop rotation, deep ploughing and stubble control, selection of resistant varieties, reasonable dense planting and other measures can reduce the occurrence probability of corn borer. In addition, during the growth of corn, weeds and diseased residues in the field should be removed in time to reduce the overwintering place of corn borer.
Biological control: The use of natural enemies such as red-eyed bees, ladybugs, etc., can effectively control the harm of corn borer. In the peak spawning period of corn borer, natural enemy insects can be released for control.
Chemical control: In the peak hatching period to the 3rd instar larval stage of corn borer larvae, high-efficiency and low-toxicity pesticides such as chlorantraniliprole and emamectin benzoate can be used for spray control. Spray evenly and thoughtfully to ensure that the solution covers all parts of the corn plant. At the same time, it is necessary to pay attention to the safe use of pesticides to avoid harm to the environment and the human body.
In conclusion, corn borer is a pest that seriously harms corn yields. In order to ensure the yield and quality of corn, farmers should understand the hazards, occurrence rules and control methods of corn borer, and take corresponding measures to prevent and control it. Through the comprehensive application of agricultural control, biological control and chemical control methods, we can effectively control the harm of corn borer and provide a strong guarantee for the healthy growth of corn.