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The causes of cotton injury and its control methods
In recent years, in some cotton producing areas, cotton often grows very high and is very prosperous, but its buds are small and its buds are high. The cotton yield is low, which seriously affects the enthusiasm of the producers. The main reason for this is cotton medicine. Caused by the harm. There are two main reasons for cotton injury. One is acute injury, which usually appears in the leaves and buds of cotton. There are coke edges and focal spots, and some cotton leaves are all coke and shedding. This kind of phytotoxicity is easy to find and easy to avoid. It is a chronic phytotoxicity. The appearance of cotton plants has no obvious features, but the physiology of cotton plants is disordered and the supply of organic materials is out of balance. As a result, flower buds are getting smaller and smaller and grow and then fall off. This vicious circle causes irreparable losses. The causes of cotton injury are due to the rapid development of various pests and serious damage. Second, pest control often uses a single pesticide, which causes pests to produce resistance to pesticides. Third, pesticides are applied during pest management to increase the concentration of pesticides. And application amount. For pesticides such as organophosphates currently sold on the market, no matter which method of pesticide application is used, as long as the concentration exceeds 1,000 times, physiological phytotoxicity will be caused to cotton. However, some cotton growers use high-concentration pesticides as soon as possible to kill pests. Although the pests were stricken, they caused severe phytotoxicity to cotton, resulting in large investment, low yield, and high costs. Measures to prevent the occurrence of phytotoxicity in cotton First, to improve the quality of pest control, strict pest control standard Aphids are the main pests in cotton growth, the treatment of locusts to be treated early treatment, the general cotton locusts should not be made before the cotton leaf roll drug killing In addition, in order to prevent aphids from developing resistance, special attention must be paid to the quality and effectiveness of the first and second pest control. Second, the use of pesticides need to do experiments to avoid the blindness of a variety of pesticides on the pest killing effect varies. So no matter what kind of drug, you need to master the actual use of the concentration and dosage after the experiment, to strictly control , No purpose to increase the amount of investment in pharmaceutical concentration, both increased investment, but also make cotton produce phytotoxicity. Third, the uniform deployment of pesticide concentration in a unified cylinder or barrel, can not be almost randomly put, so easy to cause the concentration of the drug is too large or too small, too large to produce injury, too little effect is poor. Fourth, several alternatives, prevention and control of a single use of a pesticide to control cotton pests, when a pesticide is used several times in a row, the insects will have the ability to resist drugs, which is what people often say that pesticides can not afford pests In order to avoid the occurrence of such a situation, when pests are to be killed, they should be used in a variety of ways as much as possible, and they cannot be resistant to certain kinds of pesticides in the body of pests. Fifth, even spraying, leaving no dead ends when using compressed spray pest control, use a small spray, expand the spray range, to prevent excessive droplets, so that the cotton victim, while fighting the gas, and continue to change the direction of the nozzle, do To prevent it, but also to prevent it. Do not leave corners. 6. Remedies for a large amount of shedding of cotton have been described as having been harmed by phytotoxicity. At this time, methods such as forced pruning and fine twigs can be adopted to overcome some of the problems and avoid significant reductions in production.