Each pesticide has its own special effects, but some pesticides can be mixed, and the effect is very good. The reasonable combination of pesticides can improve the safety of crops. The China Pesticide Network Xiaobian summarizes the combination of some perfect pesticides for your reference:
First, the combination of pest control and protection of natural enemies. Different types of pests in different periods, the types of natural enemies are also different, while protecting pests, it is necessary to protect and utilize natural enemies. For example, some plants have a serious occurrence of certain plant leaf mites, while leaf-eating pests are lighter and fail to reach the control index. Therefore, when using the drug, you can choose 15% scented emulsifiable concentrate, 20% sputum sputum, and other specific acaricidal agents. Do not use broad-spectrum insecticides such as Kung Fu and Zhanshi.
Second, the combination of biological pesticides and chemical pesticides. Biological pesticides such as Bacillus thuringiensis and Beauveria bassiana have strict requirements on temperature and humidity. After hitting the target, there is a physiological and biochemical process in the harmful organisms, which has a slower effect, but the drug lasts for a long time, while the chemical pesticides are large. Some have the effects of knockdown, contact killing, fumigation, systemic absorption, stomach poisoning, etc., and the effect is quicker.
Third, the combination of insecticide and fungicide use. In production, diseases and pests often occur simultaneously with the growing season, so the method of compounding pesticides should be adopted in prevention and control. For example, the occurrence of pear hibiscus is also the period of pear black spot disease, which can be controlled by 10% imidacloprid WP 5000 times solution + 40% carbendazim WP 1000 times mixture.
Fourth, the method and concentration of pesticides are combined with different dosage forms and different contents. Pesticide manufacturers make different dosage forms and contents in order to adapt to different regions and different uses. Therefore, when using pesticides, it is necessary to combine different dosage forms and contents, and choose different methods and concentrations.
5. Use of a combination of agents and different types of pests. Whether it is insecticides or fungicides, a considerable part is mainly for certain types of pests or a certain kind of pests, even for different periods of certain pests (nymphs, larvae, pupa, adults, eggs). Developed, such agents have poor or only auxiliary effects on other pests, and are even ineffective.
Sixth, the prevention period is combined with the drug and dose. The different developmental stages of a plant, the same type or the different occurrences of a certain pest are different in response to the agent, and the dosage and dosage used are not the same. For example, avermectin has an effect on larvae and eggs, but has no effect on cockroaches and adults. It cannot be used in the flood season and adult stage. For example, arsenic mixture (sulphur-sulfur suspension) is used to control pear hibiscus and Kang’s. Whitefly, the different degrees of Baume used in different periods, generally 3-5 degrees before the pear white period, and 0.3-0.5 degrees after the balloon period, otherwise it will cause phytotoxicity.
7. The concentration of the drug is combined with the temperature and humidity, and the strong and weak sunlight. In production, the higher the temperature, the more severe the pests occur. Many fruit farmers use pesticides at higher concentrations, but they still cannot be cured. In fact, the main reason for the failure is that the leaves are large, the second is the thick leaves, and the third is the concealment of pests, which brings certain difficulties to the operation. Whether it is an insecticide or a fungicide, its control effect is greatly affected by the temperature and humidity, and the strong and weak sunlight. Under normal circumstances, the higher the temperature, the worse the stability of the pesticide's drug properties, the faster the decomposition, the higher the drug effect, then the concentration should be relatively low. The greater the humidity of the fungicide, the worse the effect, and the relative use concentration should be increased.
8. Combination of specific use, alternating use and mixed use of pesticides in prevention and control.
9. The choice of pesticides should be combined with the sensitivity of plants to pesticides. Some plants are sensitive to certain pesticides, such as peaches, cherries, apricots, and plums, which are sensitive to dichlorvos, which are easy to cause a large number of deciduous fruits. They should be banned on such plants; some insecticides and fungicides are used. A slight concentration of the concentration causes Sydney tiger skin disease, which seriously reduces the value of the commodity.
Ten, the use of pharmaceuticals and the use of additives. Regardless of whether the fungicide or the insecticide is generally spread, the permeability is poor, and the protective effect of the pest's own protective film or secretion, which brings great difficulties to the prevention and control of such pests. It has a good penetration and spreading effect, and it is very effective to add 0.3% detergent or 1000 times of harm to the pests such as pear flower nets, pear hibiscus and scale insects. Good penetration and exhibition to enhance the efficacy.
This article is published by the China Pesticide Network , please indicate the source.
Threaded flanges are widely demanded as pipe flanges i.e called as threaded pipe flanges used in different industrial applications.
Threaded Flanges are also known as screwed flange, and it is having a thread inside the flange bore which fits on the pipe with matching male thread on the pipe.
This type of joint connection is Speedy and simple but not suitable for high presser and temperature applications. Threaded Flanges are mostly used in utility services such as air and water.
Threaded (Screwed) flange is similar to the Slip-On flange, but the bore is threaded. Its chief merit is that it can be assembled withour welding, explaining its use in low pressure services at ordinary atmospheric temperatures, and in highly explosive areas where welding create a hazard.
The various types of threaded flanges are as follows:
Plain Threaded Flanges
Female Threaded Flanges
Male Threaded Flanges
Threaded Flanges,Raised Face Flange,Steel Threaded Flanges,Screwed Flanges
Shandong Zhongnuo Heavy Industry Co.,Ltd. , https://www.zhongnuoflanges.com