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:
1. Spot This phytotoxicity is mainly manifested on 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.
2. The reason for yellowing and yellowing is that pesticides hinder the synthesis of chlorophyll, or block the photosynthesis of chlorophyll, or destroy chlorophyll. For example, the application of chlorpyrifos on watermelon can cause yellowing of new shoots; Yellowing occurs on other crops.
3. This phytotoxicity may occur in various organs of malformed plants. Common malformations include leaf rolling, clumping, root swelling, malformed ear, malformed 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; the melon will be affected by 2, 4 -D phytotoxicity appears fan-shaped leaves, triglyceride with low purity is easy to curl the young leaves of tomatoes.
4. Withering this phytotoxicity, the whole plant performance is mainly caused by herbicide phytotoxicity. For example, watermelon seedlings are affected by green melamine phytotoxicity, yellow leaves, leafy leaves, and plant atrophy; beans are sprayed with high concentration of insecticides. Deficiency, wilting, dead seedlings and other phytotoxicity.
5. Growth stagnation growth inhibitors, herbicides improperly applied phytotoxicity, such as excessive consumption of chlormequat caused crop growth stagnation.
6. The reason for infertility causing such phytotoxicity is improper use during flowering. For example, applying rice stalks during rice heading can cause empty mites.
7. Shedding occurs frequently in fruit trees and other dicotyledonous plants, such as falling flowers, deciduous leaves, falling fruits, etc., such as application of acesulfame in peach trees and application of omethoate at flowering stage to cause defoliation, or defoliation due to copper preparation; Methamidophos causes falling flowers; improper application of ethephon in hawthorn causes fruit drop and defoliation.
8. The phytotoxicity of inferior fruit is sometimes manifested as abnormal fruit surface and poor quality. For example, watermelon is harmed by ethephon, and the melon is dark red and smelly.
1. Spot This phytotoxicity is mainly manifested on 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.
2. The reason for yellowing and yellowing is that pesticides hinder the synthesis of chlorophyll, or block the photosynthesis of chlorophyll, or destroy chlorophyll. For example, the application of chlorpyrifos on watermelon can cause yellowing of new shoots; Yellowing occurs on other crops.
3. This phytotoxicity may occur in various organs of malformed plants. Common malformations include leaf rolling, clumping, root swelling, malformed ear, malformed 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; the melon will be affected by 2, 4 -D phytotoxicity appears fan-shaped leaves, triglyceride with low purity is easy to curl the young leaves of tomatoes.
4. Withering this phytotoxicity, the whole plant performance is mainly caused by herbicide phytotoxicity. For example, watermelon seedlings are affected by green melamine phytotoxicity, yellow leaves, leafy leaves, and plant atrophy; beans are sprayed with high concentration of insecticides. Deficiency, wilting, dead seedlings and other phytotoxicity.
5. Growth stagnation growth inhibitors, herbicides improperly applied phytotoxicity, such as excessive consumption of chlormequat caused crop growth stagnation.
6. The reason for infertility causing such phytotoxicity is improper use during flowering. For example, applying rice stalks during rice heading can cause empty mites.
7. Shedding occurs frequently in fruit trees and other dicotyledonous plants, such as falling flowers, deciduous leaves, falling fruits, etc., such as application of acesulfame in peach trees and application of omethoate at flowering stage to cause defoliation, or defoliation due to copper preparation; Methamidophos causes falling flowers; improper application of ethephon in hawthorn causes fruit drop and defoliation.
8. The phytotoxicity of inferior fruit is sometimes manifested as abnormal fruit surface and poor quality. For example, watermelon is harmed by ethephon, and the melon is dark red and smelly.
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