Symptoms The use of pesticides or herbicides that exceed a certain concentration can result in the formation of abnormally colored leaf spots, such as white spots or brown spots. The buds and roots are curled or thickened, the growth of the plants is inhibited, the temporal lobe is shortened or the grains are exposed. Excessive application of chemical fertilizers or excessive application of insecticides at seeding may inhibit seed germination or death after exhumation, and residual dwarfing 4 leaves may turn yellow or die off.
Excessive use of dichlorvos, trichlorfon, phoxim, kung fu, 2,4-d, and chemical fertilizers may cause these symptoms. Excessive soluble nitrogen, potassium, and other fertilizers will inhibit seed germination or death from seedling emergence when they are close to seed; applying or drifting over 2,4-D will cause the leaves to curl into onion leaves and the lower stems and leaves cluster together. The aerial root volume does not come into contact with the soil; excessive application of phoxim can cause local or most of the leaves to whiten, causing the leaves to dry and freeze-like. Phosphorus and other organophosphorus pesticides have the mechanism of discoloration and other phytotoxicity. Hydrophobic organophosphorus pesticides are adsorbed by chloroplasts or their surrounding tissues, causing disorder of the chloroplast function and hindering the electronic conduction reaction, ie, the Hill reaction, inhibition. Photosynthesis, out
It is now discolored, and the more serious the injury is, the lower the amount of carbohydrates in the body and the relative increase in total nitrogen. Due to different conditions such as maize varieties, development stages, and environmental factors, the degree of injury is different. Will cause dead leaves, discoloration, deformity and so on. The distribution and location of phoxim in corn were different, and the susceptibility to pesticides was also different. The root application in seedling stage was especially obvious.
Control methods (1) The use of formula fertilization techniques, timely and appropriate application, should not be excessive. (2) When using herbicides, strictly select the species and master the dosage so as to avoid excessive concentration and it is not appropriate to directly spray on the bell mouth. (3) Do not use sensitive insecticides such as trichlorfon and dichlorvos in the corn field, and strictly control the amount of phoxim to control underground pests. (4) When the concentration is too high, it should be watered immediately. (5) After the occurrence of phytotoxicity, it is necessary to strengthen management. (6) If necessary, spray Fengbao I type active liquid fertilizer 400-500 times to make it normal as soon as possible.
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