The cause of phytotoxicity of protected vegetables is the misuse of pesticides that are not symptomatic or misuse of herbicides. Second, the application of pesticides is too large or repeated application, and the third is to apply under high temperature or high humidity conditions. Inferior pesticides were applied, and the fifth was that the soil application was not uniform enough.
Phytotoxicity symptoms
Spotted spots mainly occur on the leaves, sometimes on the stems or fruit epidermis, and are commonly found in brown spots, maculas, and net spots.
Yellowing and yellowing mainly occur in the stems and leaves of vegetables, with mostly leaves. The main cause of yellowing is that the pesticide destroys the chlorophyll in the leaves, the light leaves are yellow, and the heavy ones are yellow.
Malformations caused by phytotoxicity can occur in the stems, leaves, fruits and roots of vegetables. Commonly, there are rolled leaves, clumps, swollen roots, and fruit deformities.
Withering caused by withering phytotoxicity is often caused by symptoms of the whole plant, usually caused by improper application of herbicides. The wilting caused by phytotoxicity has no disease center, and the process is slower. After the yellowing, the seedlings are dead and the transduction tissue is not browned.
Growth stagnation caused by phytotoxicity The slow growth of the plant is compared with the symptoms of stagnation or deficiency caused by physiological diseases. The former is often accompanied by spots or other phytotoxicity symptoms, while the poisoning is often characterized by poor root growth. The symptoms are yellow or dark green.
Remedy
If the water spray is caused by spraying the liquid, the leaf and the plant may be sprayed with a large amount of water quickly after the early liquid has not fully penetrated or absorbed. Repeat the washing 3~4 times to try to make the liquid on the surface of the plant. It is washed away and combined with cultivating loose soil to promote root development and restore the plant to normal growth.
After applying the quick-acting fertilizer to produce phytotoxicity, it is necessary to timely water and apply quick-acting fertilizer such as urea. In addition, foliar application of 1% ~ 2% urea or 0.3% potassium dihydrogen phosphate solution to promote plant growth and improve their ability to resist phytotoxicity.
The use of an antidote or a plant growth regulator is based on the nature of the pesticide causing the phytotoxicity, using a drug that is inversely related to its nature. For example, 0.5% of the quicklime water can be sprayed after spraying a large amount of copper sulfate, and the gibberellin can be sprayed after the spraying of the paclobutrazol is excessive, and the foliar spraying can also be carried out by using the leaf surface treasure.
Irrigation and washing of the field For the field where the soil is applied excessively, the field should be washed with water as early as possible, so that a large amount of drugs can be discharged from the field with water to reduce the phytotoxicity.
Remove the fruits, branches and leaves of the victim in time to prevent the pesticides in the plant from continuing to conduct and penetrate.
Farmers Daily
Phytotoxicity symptoms
Spotted spots mainly occur on the leaves, sometimes on the stems or fruit epidermis, and are commonly found in brown spots, maculas, and net spots.
Yellowing and yellowing mainly occur in the stems and leaves of vegetables, with mostly leaves. The main cause of yellowing is that the pesticide destroys the chlorophyll in the leaves, the light leaves are yellow, and the heavy ones are yellow.
Malformations caused by phytotoxicity can occur in the stems, leaves, fruits and roots of vegetables. Commonly, there are rolled leaves, clumps, swollen roots, and fruit deformities.
Withering caused by withering phytotoxicity is often caused by symptoms of the whole plant, usually caused by improper application of herbicides. The wilting caused by phytotoxicity has no disease center, and the process is slower. After the yellowing, the seedlings are dead and the transduction tissue is not browned.
Growth stagnation caused by phytotoxicity The slow growth of the plant is compared with the symptoms of stagnation or deficiency caused by physiological diseases. The former is often accompanied by spots or other phytotoxicity symptoms, while the poisoning is often characterized by poor root growth. The symptoms are yellow or dark green.
Remedy
If the water spray is caused by spraying the liquid, the leaf and the plant may be sprayed with a large amount of water quickly after the early liquid has not fully penetrated or absorbed. Repeat the washing 3~4 times to try to make the liquid on the surface of the plant. It is washed away and combined with cultivating loose soil to promote root development and restore the plant to normal growth.
After applying the quick-acting fertilizer to produce phytotoxicity, it is necessary to timely water and apply quick-acting fertilizer such as urea. In addition, foliar application of 1% ~ 2% urea or 0.3% potassium dihydrogen phosphate solution to promote plant growth and improve their ability to resist phytotoxicity.
The use of an antidote or a plant growth regulator is based on the nature of the pesticide causing the phytotoxicity, using a drug that is inversely related to its nature. For example, 0.5% of the quicklime water can be sprayed after spraying a large amount of copper sulfate, and the gibberellin can be sprayed after the spraying of the paclobutrazol is excessive, and the foliar spraying can also be carried out by using the leaf surface treasure.
Irrigation and washing of the field For the field where the soil is applied excessively, the field should be washed with water as early as possible, so that a large amount of drugs can be discharged from the field with water to reduce the phytotoxicity.
Remove the fruits, branches and leaves of the victim in time to prevent the pesticides in the plant from continuing to conduct and penetrate.
Farmers Daily
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