Pesticides play an important role in the production of agriculture, and at the same time bring more or less adverse effects to crops. If this adverse effect is aggravated, causing abnormal reactions in crops, resulting in reduced production and degraded quality, Drug damage. The phytotoxicity is light and heavy, and there are urgency and slowness. The symptoms are summarized as follows:
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First, the plaque is mainly manifested in the leaves, with yellow spots, brown spots, dead spots and so on. For example, the application of butachlor in the early stage of rice Honda causes brown spots, and the high concentration of mancozeb causes the edge of rice leaves to be spotted. Sometimes spots are also expressed on stems and fruits. For example, if you apply mancozeb when pear fruit is small, it is easy to appear fruit spots.
Second, the reason for yellowing yellowing is that pesticides hinder the synthesis of chlorophyll, or block the photosynthesis of chlorophyll, or destroy chlorophyll, such as the application of quick-killing diced on watermelon to cause yellowing of new shoots; Drifting to other crops appears yellowing and so on.
3. This phytotoxicity may occur in various organs of malformed plants. Common malformations include leaf rolling, clumping, root swelling, malformed ear, deformed fruit, etc. If the tomato is sprayed with high concentration of naphthaleneacetic acid, the leaf will be rolled, 2,4-D will be improperly applied with hollow fruit and deformed fruit; , 4-D phytotoxicity appears fan-shaped leaves, triglyceride with low purity is easy to curl the young leaves of tomato.
Fourth, withering this phytotoxicity is generally the whole plant performance, mainly herbicide phytotoxicity, such as watermelon seedlings caused by green melamine phytotoxicity, yellow leaves, leafy leaves, plant atrophy; beans sprayed with high concentration of pesticides Deficiency, wilting, dead seedlings and other phytotoxicity.
5. Growth retardation growth inhibitors, herbicides, improper application of phytotoxicity, such as excessive use of chlormequat, causing crop growth to stagnate.
Sixth, the cause of such phytotoxicity caused by infertility is improper use of flowers, such as the application of rice feet in the rice heading will cause empty granules.
7. Falling off occurs frequently in fruit trees and other dicotyledonous plants, such as falling flowers, deciduous leaves, and falling fruits, such as the application of acesulfame in peach trees and the application of omethoate at flowering stage to cause defoliation, or the occurrence of defoliation by copper preparation; Methamidophos causes falling flowers; improper application of ethephon in hawthorn causes fruit drop and defoliation.
Eight, inferior fruit fruit phytotoxicity sometimes manifests as abnormal fruit surface, quality deterioration, such as watermelon by ethephon damage, melon dark red, smell. 
