Get out of the prevention and treatment of citrus rust

Blindly applied. For example, hitting "insurance drugs" and hitting drugs once every few days not only cause increased costs for drugs, but also pollute the environment. Moreover, due to the excessive number of drugs used, the resistance to insecticides is increased and the effect of drug treatment is reduced. What's more serious is that Missed the appropriate control period: the application may not be controlled during the appropriate period, and may not be applied during the appropriate period of control, so the insurance drug is not insurance. Prevention of rust ticks should catch low-dose drugs that cause harm. To do this, we must make observations on the insect conditions: Select 3-5 orchards, observe 3-5 strains at each site, observe 10-20 pieces of fruit at random, use 10-20 times to enlarge the microscope, and examine 4 fields of vision. If the average number of insects in each field exceeds two, or if 20% of the fruit surface is damaged, it is necessary to control the pesticide in time. Rust ticks occur 18-20 generations a year and should be kept as close as possible to previous generations. Single-use acaricides in the long term. Some orange farmers have long used dicofol, isocarbophos, omethoate and other old pesticides. These old pesticides not only seriously pollute the environment and the quality of agricultural products, they also kill a large number of natural enemies, and due to the long-term use of the drug resistance, the pesticide control effect is significantly reduced. Some new pesticides start to use good control effect, but a longer period of single use and directional selection. In this way, some highly resistant individuals are preserved, and they multiply from generation to generation. Their numbers increase from less to more and eventually become dominant populations. The lethality of this pesticide is lost. Therefore, we must pay attention to using 2-3 new pesticides and use them alternately. Such as the optional use of 34% of nicotinic EC 2000 times, 20% of broom net powder 1500 times, 1.8% Ai Li Ke (damage) 4000-5000 times EC plus 0.25% mineral oil, 20% good winter Emulsifiable concentrate 2000-3000 times, 80% 800 times of dexamethasone, 20% of 1500 times of escaping EC, 800 times of 5% of EC 800 times, use 4 times in the afternoon. After doing well, it will help to improve the control effect. At the same time pay attention to the positive and negative sides of the leaves and fruit through the liquid to ensure effective control. Use pesticides that kill large numbers of natural enemies. Such as the use of green copper, can be killed, copper ammonia, DT fungicide, double effect of copper and other copper preparations, streptomycin, Ye Qing double, bacteria poisoning and other anti-bacterial killing bacteria, killing a large number of natural enemy of the rust tick - - Thompson's hairy bacterium, which plays an important role in controlling rust wall warts. After application of the above pesticides, the number of trichostiopsis Thompson drastically decreased, resulting in the loss of rust ticks. In addition, the use of ester pesticides such as extermination, dichlormia, nisolur, and enemy killing (killed pyrethroids) killed a large number of natural enemies such as grasshoppers, ladybugs, and predators, causing large scales of rust. occur. Therefore, it is best not to use the pesticides mentioned above during the high-temperature drying period. For example, if it is used to control orange flesh, it can use 10% cockroaches, control cockroaches can use 25% ciclosporin, control anthrax can use 50% carbendazim, control flea butterfly can use 25% acephate and so on. Not timely drought irrigation. As a result, the orange orchard has a severe drought, which not only reduces the plant's ability to fight maggots, but also because the orange orchard is too dry, which is not conducive to the breeding and activity of trichostia. About 70% of the relative air and soil temperatures not only contribute to the normal growth and development of citrus, but also to the breeding and activities of melanocarpus. Therefore, it is necessary to pay attention to drought irrigation during droughts, maintain the humidity of the orange orchard, and create environmental conditions that are conducive to the function of the melanochaetes. Such as summer and fall drought, it is best to water once every 10 days or so, the use of furrow irrigation and hole irrigation methods, conditional orange garden can use sprinkler irrigation. In addition, the poorly irrigated orange orchards need to use crop straws, thatch and other weeds, and leaves covering the orchard before the drought. During dry periods, spray rough water on the canopy in the sunny afternoon to increase the humidity of the canopy.

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