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 several kinds of symptoms that can be summed up as follows: Second, 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 caused by the new shoot yellow; Tribenurum for wheat fields Yellowing appears on other crops. Third, all organs of malformed plants may have this phytotoxicity. Common deformities include leaf curling, tufting, root swelling, malformed ear, malformed fruit, etc. If tomatoes are sprayed with high concentrations of naphthaleneacetic acid, curls will appear, and 2.4-D improper application of hollow fruit or malformed fruit; melons are affected by 2,4 -D drug injury fan-shaped leaves, low purity of triacontanol tends to curl the leaves of tomatoes and so on. 4. Withering, the whole plant performance is generally caused by herbicides. For example, the watermelon seedlings are damaged by chlorotoluron, yellow leaves appear on the leaves, and the leaf edges are scorched and atrophied; the beans are sprayed with high concentrations of pesticides. Garlic, wilt, dead seedlings and other phytotoxicity appear. Fifth, stagnation of growth inhibitors, herbicides improper application of phytotoxicity, such as excessive use of chlormechanine caused crop growth stagnation. Six, infertility caused by this kind of injury is due to improper use of flowering, such as the application of rice feet in rice heading 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 deciduous leaves are affected by copper preparations; pear trees are used. Methamidophos caused the drop; improper application of ethephon in hawthorn caused fruit drop and defoliation. VIII. Injuries in the fruit of a bad fruit sometimes manifest as an abnormality in the fruit surface, and the quality deteriorates. For example, a watermelon is harmed by an ethylene drug, and the melon mushroom is dark red and has an odor.
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First, the spots of this kind of injury are mainly reflected in the leaves, there are yellow spots, 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. 