There is a lot of knowledge about the use of pesticides . It is also a fight for drugs. In addition to the timing of drug use, drug selection and compounding, some skills are needed. Otherwise, the best medicines will not work. Determine the time of fight based on temperature and its changing trend Whether it is a plant or an insect or a pathogen, 20 to 30 ° C, especially 25 ° C, is the most suitable activity temperature. At this time, it is more effective to fight the pests and diseases in the active period and to make the crops safer. In the summer hot season, the time of fight should be before 10 am and after 4 pm. Spring and autumn cool season, should be selected before 10 o'clock in the morning before 2 o'clock in the afternoon. In the greenhouse in winter and spring, it is best to choose to fight in the morning in sunny weather. Determine the time of fight based on humidity and its changing trend After the liquid sprayed from the nozzle is deposited on the target, it needs to be unfolded to form a uniform film to cover the surface of the target to the greatest extent, thereby "masking" the pests on the target. The deposition of the liquid from sediment to deployment can be affected by a variety of factors, with a greater impact of air humidity. The humidity of the air is small, the moisture in the drops will quickly evaporate into the air, and even the solution will not be spread on the target, which will of course reduce the efficacy and even the burning of the drug. If the humidity of the air is too large, the liquid medicine deposited on the surface of the plant, especially the large droplets, will easily condense into larger droplets, and the secondary sedimentation of the plant affected by gravity will also cause phytotoxicity. Therefore, the time of the fight in a day needs to follow two principles, one is that the air humidity is slightly dry, and the other is that after the fight, the liquid can form a dry film on the target surface before sunset. Three common illusions of fighting drugs Is the amount of pesticide in each bucket of water determined only by the dilution factor? Most people are accustomed to calculating how much potion in a bucket of water by dilution factor, which is actually not very reliable. The reason for controlling and calculating how much medicine is added to the medicine box is because it is necessary to calculate how much dose of the medicine is needed per plant area to ensure good efficacy and safety for plants and the environment. Special reminder: After adding the amount of medicine in each barrel of water according to the dilution factor, it is necessary to calculate the details of several barrels of water per acre and the speed of spraying. At present, due to the constraints of the labor force, many people tend to add the amount of medicine to the liquid tank, and quickly spray it. This method of putting the cart before the horse is obviously wrong. The most reasonable measure is to choose a device with better spray performance, or according to the product manual, carefully spray. The closer the nozzle is to the target, the better the efficacy will be. After the liquid is ejected from the nozzle, it collides with the air and ruptures into smaller droplets. The result is that the droplets become smaller and smaller as a result of stumbling. That is to say, the farther away from the nozzle, the smaller the droplet is within a certain distance. Small droplets are easier to deposit and spread on the target. Therefore, it does not mean that the nozzle is more closely attached to the plant. In general, the spray head of the knapsack electric sprayer should be kept at a distance of 30 to 50 cm from the target, and the motorized sprayer should be kept at a distance of about 1 m. According to the performance of the sprayer and its nozzle, the spray nozzle allows the mist to fall. On the target, the effect will be better. The finer the droplets, the better the efficacy? The droplets are not as small as possible, and the size of the droplets is related to their better distribution, deposition and spreading on the target. If the droplets are too small, they will float in the air and it will be difficult to deposit on the target. This will definitely cause waste. If the droplets are too large, the liquid falling on the ground will increase and waste. Therefore, according to the control object and the space environment in which it is controlled, it is necessary to select suitable spray equipment and nozzles, and to control the diseases and pests such as whitefly, mites and other tiny pests in a relatively closed shed, and to control these pests and diseases in the open field. When you have time, you have to choose a device with a larger fog and a nozzle. The fog machine is obviously not suitable. Precautions when using several pesticides 1. Omethoate: hops, compositae, some varieties of sorghum and tobacco, jujube, peach, plum, apricot, plum, olive, fig, citrus and other crops, sensitive to the water doubling ratio of 1500 times or less It should be tested first before use to determine its concentration. Omethoate is prohibited from being used on fruit trees. 2, trichlorfon: particularly sensitive to corn, apples, sorghum, beans, easy to produce phytotoxicity, peach trees are banned. 3, dichlorvos: sensitive to sorghum, beans, rose, corn, melon seedlings and rubber, should be used with caution. It is highly susceptible to phytotoxicity to stone fruit trees and should be banned. (For example, peach trees spray dichlorvos, trichlorfon, dimethoate, etc. before the hard core period, which is easy to cause fruit drop). 4, 虱 虱 Ling: Do not directly contact the cabbage, radish, or brown spots and green leaves will appear. 5, chlorpyrifos: medicinal damage to melon seedlings, should be used after 1 metre long melon; sensitive to tobacco. 6, speed culling: avoid flowering use, so as not to cause phytotoxicity. If the concentration is increased arbitrarily, it will cause brown leaf spots. In June-July, the temperature is more than 30 °C and 800-1000 times, the young fruit is easy to produce phytotoxicity. 7, phoxim: sensitive to cucumber, beans, taro, sugar beet, rice, corn, etc., easy to produce phytotoxicity. 8, dicofol and dicofol: sensitive to some apples, pears, low temperatures, more humid weather. Dicofol is prohibited from being used on tea or fruit. 9, three-ring tin: citrus is prone to phytotoxicity. 10, triazolyl: spraying 1300 times triazolium tin in August-September will increase the incidence of orange fruit sunburn. 11, oil emulsion: germination and flowering spray oil 150 times +40% sulphate 1200-1500 times, causing phytotoxicity, 10-15 days after spraying the oil emulsion to spray stone sulphur mixture, Bordeaux mixture; sprayed Do not use organophosphorus pesticides within 1 week of pineine mixture, and do not spray stone sulfur mixture within 20 days. 12, pyrethroid: the drug used in the orange orchard more than 2 times will induce sputum outbreaks. 13. Isoprocarb (Ye Yi San): It has phytotoxicity to potato. 14. Insecticide double: It is easy to cause phytotoxicity to cruciferous vegetable seedlings such as Chinese cabbage and cabbage, and citrus and other crops. Spraying citrus 300 times in the summer will cause yellowing of the leaves and fruits. 15. Insecticide: It has phytotoxicity to cotton and beans. 16, inhibition Taibao: sensitive to cabbage seedlings. 17. Kezhen San: It is not recommended to be mixed with silkworm insecticides , because the silkworm toxin insecticide is accelerated to be highly toxic to the silkworm poison. 18. Adding rice: It has slight phytotoxicity to soybeans and alfalfa. It should be taken care of when using nearby soybeans and alfalfa. 19, chlorothalonil: used in pears, persimmon trees, easy to produce phytotoxicity. 20, antibacterial: sensitive to peach, plum, nai, especially peach trees, should be used with caution. 21, Daisen zinc: used on cucumber, prone to minor phytotoxicity. 22, Daisen fibrin zinc: not suitable for edamame, lychee, grape young fruit period, tobacco, cucurbit crops, some pear tree varieties with caution. 23, Cobo: Cucumber, pepper seedlings are prohibited. 24, diniconazole: not suitable for cabbage, mustard, cucumber, tomato seedlings. 25, triazolone: ​​not suitable for cabbage, beans, mustard, cucumber, tomato seedlings. 26, Bordeaux liquid: cabbage, peach, plum, nai in the growing season is sensitive to it, regardless of the formula is easy to produce phytotoxicity; can be used on apples, pears, grapes. Control citrus scab in spring, the temperature exceeds 30 °C, the bud length is longer than "1cm", and the spray of 0.8% of the same amount of Bordeaux mixture will produce severe burning buds. It is safer to spray 0.5% double Bordeaux mixture; pear pair The copper ion is sensitive, it is necessary to use a multi-type Bordeaux mixture; the grape is sensitive to lime, and the lime half-type Bordeaux mixture is applied. For example, in the high temperature period around noon in the summer, the rainy days, the morning fog and the dry weather, and the spraying in the windy weather are easy to cause phytotoxicity. Preparation method: dilute copper sulfate, lime with 80% and 20% water and then slowly squirt copper sulfate into lime water. 27, stone sulfur mixture: pear, plum, peach, nai, grapes, beans, potatoes, tomatoes, onions, ginger, melon, cucumber, cabbage, large wheat, tea, etc., when the tissue is young, easy to produce phytotoxicity, It should be banned; use of citrus immediately after fruit picking or low temperature weather (frost weather) sulphur sulphur mixture can cause serious defoliation. 28, can be killed, crown bacteria copper, copper sulfate: not suitable for a variety of crop flowering, young fruit period. 29, cable, stable kill, cover grass can, take the net, trifluralin, glyphosate: sensitive to grass crops, easy to produce phytotoxicity. 2,4-D (120 kg per gram should be evenly sprayed with water, if 60 kg of water is easy to produce phytotoxicity), and metformin is more sensitive to cotton, hemp, banana and other crops, should pay attention. (Source: Tianbao Agricultural Technology Service Platform) Fy Bearing Heater,Cone Bearing Heater,Fag Bearing Heater,Eddytherm Bearing Heater Taizhou Juhuan Lifting Protection Equipment Co., Ltd , https://www.jsjoba.com