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, spots 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 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 sugar on watermelon to cause new shoots yellow; suitable for fensulfuron in wheat field Drifting to other crops appears yellowing and so on.
3. Malformations This phytotoxicity may occur in various organs of 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.
4, withered, 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 stagnation growth inhibitors, herbicides improperly applied phytotoxicity, such as excessive consumption of chlormequat caused crop growth stagnation.
6, infertility caused by such phytotoxicity is improper use of flowers, such as the application of rice feet in the rice heading will cause empty granules.
7. Shedding 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.
8. Inferior fruit The phytotoxicity of the fruit sometimes manifests as abnormal fruit surface and poor quality. For example, watermelon is harmed by ethephon, and the melon is dark red and smelly.
1, spots 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 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 sugar on watermelon to cause new shoots yellow; suitable for fensulfuron in wheat field Drifting to other crops appears yellowing and so on.
3. Malformations This phytotoxicity may occur in various organs of 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.
4, withered, 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 stagnation growth inhibitors, herbicides improperly applied phytotoxicity, such as excessive consumption of chlormequat caused crop growth stagnation.
6, infertility caused by such phytotoxicity is improper use of flowers, such as the application of rice feet in the rice heading will cause empty granules.
7. Shedding 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.
8. Inferior fruit The phytotoxicity of the fruit sometimes manifests 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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