Symptoms use pesticides or herbicides, which exceeds a certain concentration and can form abnormal colors, such as white spots or brown spot. Young buds and roots are curled or thicker, plant growth is suppressed, bud leaves are shortened or spikes are exposed. During sowing, excessive fertilizer is applied or excessive for pesticides, which will inhibit the seed germination or death after being unearthed.
Excessive application of the cause of the cause of the enemy, the enemy of the enemy, the phosphorus, the kung fu, the 2,4 one D and the fertilizer, etc., may produce the above symptoms. Excessive soluble nitrogen, potassium and other fertilizers are close to seeds, which will inhibit the seeds of the seeds or death after the seedlings are unearthed; 2,4-D that is applied or drifting can make the leaves curl into onion leaves, and the lower stems and leaves are clustered together. Root the roll does not contact the soil; excessive phosphorphy can cause the leaves or most of the leaves to turn white, causing dry leaves to dry like frost. The mechanism of drug -changing and other drugs such as organic phosphorus and other organic phosphorus pesticides is that the organic phosphorus pesticide with strong hydrophobicity is adsorbed by chloroplasts or surrounding tissues, causing the function of chloroplast to disorders, which hinders electronic conduction reactions, that is, Hill response, inhibit Light synthesis, discoloration, the more severe the drug damage, the decrease in the content of carbohydrates in its body, and the total nitrogen volume is relatively increased. Due to different conditions such as corn variety, development stage, environmental factors, etc., the degree of medicinal damage is different. It will cause death, discoloration, deformity, etc. The distribution and location of sulfurization in corn is different, the sensitivity to the pharmaceutical agent is also different, and the medication effect is particularly obvious.
Control method (1) Formulating fertilization technology, appropriate appropriate amount, should not be excessive. (2) Strict selection of varieties and mastery dosage when using herbicides to avoid excessive concentration, and it is not advisable to spray directly at the speaker mouth. (3) Do not use sensitive insecticides such as enemies and dichlorvos in corn fields, and strictly grasp the dosage when applying pivotylin to underground pests. (4) Watering should be immediately found to find too high concentration. (5) After drug damage, we must strengthen management. (6) Speak 400-500 times the active liquid fertilizer of type I type I type when necessary, so that it will return to normal as soon as possible.