Causes and prevention methods of cotton phytotoxicity
In recent years, in some cotton producing areas, cotton tends to be very tall and very prosperous, but the flower buds are small, the buds are more, and the cotton yield is low, which seriously affects the enthusiasm of the producers. The main reason for this is cotton medicine. Caused by harm.
There are two main reasons for cotton phytotoxicity. One is acute phytotoxicity, which is usually manifested in the leaves and buds of cotton, which have focal edges and focal spots. Some cotton leaves are all over-coke, which is easy to find and easy to avoid. The second is chronic phytotoxicity. The appearance of cotton plants has no obvious characteristics, but the internal physiology of cotton plants is disordered, the supply of organic matter is imbalanced, and the flower buds are getting smaller and smaller, and they fall off after they grow out. This vicious circle causes irreparable damage.
The cause of cotton phytotoxicity is that the development of various pests is rapid and the damage is serious. Second, the use of a single pesticide is often used to control pests, which causes pests to develop resistance to pesticides. Third, when pesticides are applied, the concentration of pesticides is increased. And the amount applied. Pesticides currently on the market, such as organophosphorus, no matter which method is applied, as long as the concentration exceeds 1000 times, it will cause physiological damage to cotton. However, some cotton growers use high-concentration pesticides as soon as possible to kill pests. Although the pests have been cured, the cotton has serious phytotoxicity, resulting in large investment, low yield and high cost.
Measures to prevent phytotoxicity of cotton First, improve the quality of pest control, strict pest control standards Aphids are the main pests in the growth of cotton, and the treatment of aphids should be treated early. Generally, cotton aphids should be killed before the cotton leaves are rolled. In addition, in order to prevent the resistance of mites, special attention should be paid to the quality and effect of the first and second treatments.
Second, the use of pesticides must first do experiments to avoid blindness. The killing effect of various pesticides on pests varies. Therefore, no matter which kind of medicine is used, it is necessary to grasp the actual concentration and dosage of the drug after the experiment, and to strictly control the amount of the drug concentration without aim, which not only increases the investment, but also causes the cotton to cause phytotoxicity.
Third, the uniform concentration of pesticides in a unified tank or barrel, can not be placed almost randomly, which is easy to cause the concentration of the drug is too large or too small, too large to produce phytotoxicity, too small effect.
Fourth, several alternations, prevention and control of a single use of a pesticide to control cotton pests, when a certain pesticide is used several times in a row, the pest will produce resistance to drugs, which is why people often say that pesticides do not The reason for the action, in order to avoid preventing this from happening, should be used as many times as possible when killing pests, and it is impossible to resist certain pesticides in the pests.
5. Spray evenly, without leaving a dead angle. When using compressed spray to control insects, use a small spray to expand the spray range to prevent the mist from being too large, so that the cotton is damaged. At the same time, it is necessary to change the direction of the nozzle and continue to change the direction of the nozzle. Go to both prevention and prevention. Do not leave a dead end.
Sixth, the remediation of cotton a large number of shedding phenomenon has already indicated that the phytotoxicity has been taken. At this time, methods such as forced pruning and fine pruning and leaf-leaving can be adopted to partially overcome the large-scale production.
There are two main reasons for cotton phytotoxicity. One is acute phytotoxicity, which is usually manifested in the leaves and buds of cotton, which have focal edges and focal spots. Some cotton leaves are all over-coke, which is easy to find and easy to avoid. The second is chronic phytotoxicity. The appearance of cotton plants has no obvious characteristics, but the internal physiology of cotton plants is disordered, the supply of organic matter is imbalanced, and the flower buds are getting smaller and smaller, and they fall off after they grow out. This vicious circle causes irreparable damage.
The cause of cotton phytotoxicity is that the development of various pests is rapid and the damage is serious. Second, the use of a single pesticide is often used to control pests, which causes pests to develop resistance to pesticides. Third, when pesticides are applied, the concentration of pesticides is increased. And the amount applied. Pesticides currently on the market, such as organophosphorus, no matter which method is applied, as long as the concentration exceeds 1000 times, it will cause physiological damage to cotton. However, some cotton growers use high-concentration pesticides as soon as possible to kill pests. Although the pests have been cured, the cotton has serious phytotoxicity, resulting in large investment, low yield and high cost.
Measures to prevent phytotoxicity of cotton First, improve the quality of pest control, strict pest control standards Aphids are the main pests in the growth of cotton, and the treatment of aphids should be treated early. Generally, cotton aphids should be killed before the cotton leaves are rolled. In addition, in order to prevent the resistance of mites, special attention should be paid to the quality and effect of the first and second treatments.
Second, the use of pesticides must first do experiments to avoid blindness. The killing effect of various pesticides on pests varies. Therefore, no matter which kind of medicine is used, it is necessary to grasp the actual concentration and dosage of the drug after the experiment, and to strictly control the amount of the drug concentration without aim, which not only increases the investment, but also causes the cotton to cause phytotoxicity.
Third, the uniform concentration of pesticides in a unified tank or barrel, can not be placed almost randomly, which is easy to cause the concentration of the drug is too large or too small, too large to produce phytotoxicity, too small effect.
Fourth, several alternations, prevention and control of a single use of a pesticide to control cotton pests, when a certain pesticide is used several times in a row, the pest will produce resistance to drugs, which is why people often say that pesticides do not The reason for the action, in order to avoid preventing this from happening, should be used as many times as possible when killing pests, and it is impossible to resist certain pesticides in the pests.
5. Spray evenly, without leaving a dead angle. When using compressed spray to control insects, use a small spray to expand the spray range to prevent the mist from being too large, so that the cotton is damaged. At the same time, it is necessary to change the direction of the nozzle and continue to change the direction of the nozzle. Go to both prevention and prevention. Do not leave a dead end.
Sixth, the remediation of cotton a large number of shedding phenomenon has already indicated that the phytotoxicity has been taken. At this time, methods such as forced pruning and fine pruning and leaf-leaving can be adopted to partially overcome the large-scale production.
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