In addition to harming corn, the life habit of corn red spider also harms cotton, beans, peanuts, melons, weeds, etc., so that if the planting leaves of the plants gather the leaves of the leaves, the affected areas will show chlorotic spots or streaks. In severe cases, the entire blade turns white and dry. After the emergence of corn, the corn red spiders that are harmful on the weeds are gradually transferred to the corn field. From July to August, it is a dangerous period. First, it will occur in the cornfield. If the weather conditions are suitable, it will spread to the whole field.
The occurrence of light rain from July to August is good for its occurrence and spread, but heavy rain, heavy rain or excessive temperature will inhibit its reproduction. Sandy soil corn fields are heavier than other soily corn fields.
Control method
Agricultural control: timely and thoroughly remove weeds in the fields, land, and canals, reduce the food and breeding sites of corn red spiders, reduce the number of insect sources, and prevent them from being transferred to the fields; avoid intercropping with crops such as beans and peanuts, and prevent them. Mutual transfer of hazards.
Chemical control: focus on the lower middle blade. Optional 15% broom net 3000 times solution, or 40% omethoate 1000~1500 times solution, or 15% broom and 40% omethoate in a ratio of 1:1 after mixing, or 1 per acre ~ 1.5 kg of phorate or granulated phosphorus emulsion mixed with appropriate amount of fine sand and evenly spread between the corn rows.
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