Pesticides play a very important role in the production of agriculture, but also have more or less adverse effects on crops. If such unfavorable effects are aggravated, they cause crops to respond abnormally, resulting in reduced yields and declining quality. Phytotoxicity. There are light and heavy injuries, there are acute and slow, summed up the symptoms are the following: 1, specks of this disease mainly in the leaves, there are macular, brown spots, dead spots and so on. If butachlor is used to cause brown spots in the early stage of rice field application, a high concentration of mancozeb may cause spots on the edges of rice leaves. Sometimes the spots also appear on stems and fruits, such as small pears when applied mancozeb prone to fruit surface spots. 2. The cause of yellowing and yellowing is that pesticides hinder the synthesis of chlorophyll, or block the photosynthesis of chlorophyll, or destroy chlorophyll, such as rapid extermination and killing on the watermelon; yellowing of new shoots; tribenuron-methyl for wheat fields Yellowing appeared on other crops. 3. This phytotoxicity may occur in various organs of malformed plants. Common deformities include leaf curling, tufting, root swelling, malformed ear, malformed fruit, etc. If tomatoes are sprayed with high concentrations of naphthylacetate, leaf curling will occur, hollow fruit, and malformed fruit will appear as a result of improper application of 2,4-D; ,4-D injury occurred fan-shaped leaves, the low purity of triacontanol tends to curl the tomato leaves. 4, withered this phytotoxicity is generally the performance of the whole plant, mainly herbicide phytotoxicity, such as watermelon seedlings by chlorothalonil damage appears yellow leaves, leaf margin coking, plant atrophy; beans sprayed with high concentrations of pesticides Garlic, wilt, dead seedlings and other phytotoxicity appear. 5, stagnation of growth inhibitors, herbicides improper application of phytotoxicity, such as excessive use of chlormestats cause crop growth stagnation. 6, infertility caused by this kind of injury is due to improper use of flowering, such as the application of rice seedlings when heading rice will cause empty grains. 7. Shedding occurs on fruit trees and other dicotyledonous plants, such as falling flowers, fallen leaves, and fruit droppings. For example, peaches use isocarbophos and flowering omethoate to cause defoliation, or defoliation is affected by copper preparations; pear trees are used. Methamidophos caused the drop; improper application of ethephon in hawthorn caused fruit drop and defoliation. 8. Injury of fruit of bad fruit sometimes manifests as abnormality of fruit surface and deterioration of quality. For example, watermelon suffers from ethylene toxicity, and melons are dark red with odor.
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