Every vegetable production enters the peak season, especially in the summer, when the temperature is too high, vegetable farmers all over the country are often reflected in the process of spraying pesticides, and vegetables are prone to phytotoxicity. Analyze the reasons, first, the climate and environmental changes induced drug harm; Second, misuse of pesticides that are not correct; Third, improper operation techniques, high doses; Fourth, there is no preventive measures to control the spread of phytotoxicity.
Summarizing the symptoms of most vegetables, often with the following symptoms, some monocotyledons misuse herbicides such as herbicides, herbicides and other herbicides, they begin to show signs of stagnation, and buds and sections of meristem appear around 5 days. The heart leaves and other leaves gradually turn purple or yellow, withering for about 10 days; some soybeans are treated with acetochlor before sowing, and the leaves are hypothermia and rainy after emergence, causing the leaves to shrink, the surface rough, the midrib to become shorter, and the single leaves to be heart-shaped or Cup-shaped, dwarfed plants, pale leaves. Some soybeans use sulfonylurea herbicides at the three-leaf stage, such as chlorsulfuron-methyl herbicides, which tend to yellow the leaves, shrink the leaves, turn brown veins and stems into the tissue, and easily break the stems. The point of necrosis, although there may be branches in the late, but late-maturing glutinous, reduced yield; some improper application of glyphosate, mist floating on the vegetables, the whole plant chlorosis, necrosis, dry; some sweet corn Affected by paraquat, the new leaves first wilted and then dried up to the whole leaf; some eggplants and tomato plants were inhibited by the growth point, and the leaves were cup-shaped, mainly by carbamoyl herbicides such as chlorfenapyr. harm.
In order to prevent and alleviate herbicides causing phytotoxicity to vegetables, the following technical measures should be taken care of:
Adjust the medication according to the ecological environment. Herbicides should not be applied when the temperature is below 15°C or above 35°C. When high temperatures, droughts, and strong light are used, weeding herbicides should be avoided. When the temperature is between 15 and 30°C and the soil is soiled, herbicides applied after 4 o'clock in the morning before 10 o'clock in the morning are effective. The use of herbicides in soils with low organic content and high salinity is less effective. Soils with high organic matter content and low salinity have a strong adsorption capacity for herbicides and are generally not susceptible to phytotoxicity.
Select the right medicine and apply it at the right time. At present, there are many types of herbicides. First, we should select drugs for the types of weeds that are easily associated with the local vegetable crops. Second, we must dilute the drugs according to the type of herbicide and the content of active ingredients. Third, we can scientifically mix drugs, but we cannot Random use of indiscriminate use; fourth is to grasp the time of application, such as before sowing, before emergence, after emergence, should strictly distinguish between medication.
Found phytotoxicity and timely remedy. When herbicide harm occurs on vegetable crops, according to local experience, Huimanfeng active liquid fertilizer can be used to alleviate or relieve the phytotoxicity. For example, pepper can be sprayed with 1:800 to 1000 times dilution, and other vegetables can be sprayed 1: 500 times liquid; can spray 1:800 times the harvest No. 1; can spray 0.05% of the 920 solution; can spray PBO and other regulators, both detoxification, but also to repair damaged cells; can increase urea, water fecal Such as quick-impact nitrogen fertilizer raising seedlings.
Summarizing the symptoms of most vegetables, often with the following symptoms, some monocotyledons misuse herbicides such as herbicides, herbicides and other herbicides, they begin to show signs of stagnation, and buds and sections of meristem appear around 5 days. The heart leaves and other leaves gradually turn purple or yellow, withering for about 10 days; some soybeans are treated with acetochlor before sowing, and the leaves are hypothermia and rainy after emergence, causing the leaves to shrink, the surface rough, the midrib to become shorter, and the single leaves to be heart-shaped or Cup-shaped, dwarfed plants, pale leaves. Some soybeans use sulfonylurea herbicides at the three-leaf stage, such as chlorsulfuron-methyl herbicides, which tend to yellow the leaves, shrink the leaves, turn brown veins and stems into the tissue, and easily break the stems. The point of necrosis, although there may be branches in the late, but late-maturing glutinous, reduced yield; some improper application of glyphosate, mist floating on the vegetables, the whole plant chlorosis, necrosis, dry; some sweet corn Affected by paraquat, the new leaves first wilted and then dried up to the whole leaf; some eggplants and tomato plants were inhibited by the growth point, and the leaves were cup-shaped, mainly by carbamoyl herbicides such as chlorfenapyr. harm.
In order to prevent and alleviate herbicides causing phytotoxicity to vegetables, the following technical measures should be taken care of:
Adjust the medication according to the ecological environment. Herbicides should not be applied when the temperature is below 15°C or above 35°C. When high temperatures, droughts, and strong light are used, weeding herbicides should be avoided. When the temperature is between 15 and 30°C and the soil is soiled, herbicides applied after 4 o'clock in the morning before 10 o'clock in the morning are effective. The use of herbicides in soils with low organic content and high salinity is less effective. Soils with high organic matter content and low salinity have a strong adsorption capacity for herbicides and are generally not susceptible to phytotoxicity.
Select the right medicine and apply it at the right time. At present, there are many types of herbicides. First, we should select drugs for the types of weeds that are easily associated with the local vegetable crops. Second, we must dilute the drugs according to the type of herbicide and the content of active ingredients. Third, we can scientifically mix drugs, but we cannot Random use of indiscriminate use; fourth is to grasp the time of application, such as before sowing, before emergence, after emergence, should strictly distinguish between medication.
Found phytotoxicity and timely remedy. When herbicide harm occurs on vegetable crops, according to local experience, Huimanfeng active liquid fertilizer can be used to alleviate or relieve the phytotoxicity. For example, pepper can be sprayed with 1:800 to 1000 times dilution, and other vegetables can be sprayed 1: 500 times liquid; can spray 1:800 times the harvest No. 1; can spray 0.05% of the 920 solution; can spray PBO and other regulators, both detoxification, but also to repair damaged cells; can increase urea, water fecal Such as quick-impact nitrogen fertilizer raising seedlings.
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