The most common method for pest control is to use pesticides . However, in the course of use, farmers often report that the efficacy is not good. There are also some “good medicines†with complete three-certification, new ingredients, sufficient content and new dosage forms. The "fake medicine" hat was buckled, and the pesticides that were smashed were not rare. There are many factors that affect the efficacy of pesticides:
1. Pesticide's own factors affect the efficacy of the drug. The ingredients, physicochemical properties and dosage forms of the pesticides all affect the efficacy of the drug. There are differences between the different dosage forms of the same ingredients. The production process and the production capacity of each company are different. The effect will also be different, and at the same time, it cannot be ruled out that some companies make a fuss about the content, and stealing the content affects the efficacy.
2. The quality of the spray affects the quality of the spray. The quality of the spray directly affects the level of efficacy. At present, in some places, conventional spray equipment is used, and the sprayed droplets are too large. When the mist falls on the surface of the crop, it will bounce. About 50% of the liquid falls on the ground, and the effect cannot be fully exerted. If the diameter of the droplets is reduced by half in the same amount of liquid, the number of droplets obtained can be increased by 8 times, and the efficacy is also greatly improved. Many farmers worry that the liquid can not be completely stained on the surface of the crop, so they will increase the water consumption. This will not improve the efficacy and reduce the efficacy. Because the drops of the leaves on the surface of the crop leaves are limited, when the spray amount exceeds a certain limit, the fine droplets on the leaves will gather into the large droplets to reduce the amount of pesticide on the leaves.
In order to improve the quality of the spray, it is necessary to improve the existing spray equipment, reduce the aperture of the spray, reduce the diameter of the spray, and maintain a distance of more than 20 cm between the spray and the crop during spraying to form a good atomization effect, while spraying. The addition of silicone spray auxiliaries can reduce the surface tension of the liquid and reduce the loss of the liquid due to bounce, especially in crops with thick waxy layers.
3. Disease diagnosis is inaccurate, there is a bias in medication. The diagnosis of diseases depends on the experience of dealers and farmers. Because of the amount of experience, things that confuse fungal diseases and bacterial diseases sometimes occur. When fungi and bacterial diseases are mixed, many farmers are blindly identified as fungal or bacterial diseases, and a single agent is used for prevention and treatment. This diagnosis and treatment is extremely easy to miss the best prevention and treatment period of the disease, causing some pesticides to fail to meet the expectations of farmers. The effect of the drug multi-effect drug to the disease will produce the impression that the drug is not effective.
4. Misunderstanding of pesticide compounding Currently, farmers hope to solve all the pest and disease problems in one dose, and often compound pesticides of different types and different dosage forms, and there are many problems. First, there is a misunderstanding of the second dilution. The correct way is to dilute several pesticides to be used separately. After diluting one kind, pour into the nebulizer and dilute the next one, and then proceed in order, so that the role of secondary dilution in improving the effect can be truly exerted. Second, the order of administration of different dosage forms during compounding affects the efficacy of the drug. The medicine and fertilizer are foliar fertilizer, wettable powder, water-dispersible granules, suspending agent, microemulsion, water emulsion, water agent and emulsifiable concentrate, so that the mixed agent has good stability. Third, the pH of the drug affects the efficacy of the drug. According to the pesticide network , improper mixing is prone to acid-base neutralization. For example, copper preparations with a large proportion of bacterial diseases can be discolored and precipitated when mixed with other chemicals. The efficacy of the lighter will be weakened, and the serious ones may cause phytotoxicity.
5. The concept of disease prevention and control needs to be changed for the prevention and control of crop diseases. The common practice of many farmers is to “seek disease, re-treatment and light preventionâ€. Some farmers said that in order to treat the disease, there are many "special effects" for the single agent of dimethomorph, metalaxyl and cymoxanil, and these drugs are used for prevention and treatment before the disease occurs. The above varieties. This kind of "active attack" disease prevention and control method is widespread in many places. Once the drug effect is found to be reduced, the dosage is increased. The long-term use of a certain agent alone will inevitably lead to premature resistance of the pathogen, and will face a situation of no cure when the disease is outbreak. We should change the existing concept of prevention and control, adhere to the principle of “prevention first, comprehensive prevention and controlâ€, scientifically select pesticide varieties, and avoid mixing of various preparations of the same active ingredient. It is recommended to rotate the use of different ingredients and mix with protective preparations to delay The occurrence of resistance.
6. Temperature and humidity affect the efficacy of the drug to play the humidity, temperature will affect the effect of the drug, such as spraying when the dew is not dry, dew will dilute the concentration of the drug. If the temperature is too high or too low, it will affect the effect of the drug. Generally speaking, the temperature is better in the range of 20 °C ~ 30 °C.
It is unrealistic to pursue "special effects" blindly. The China Pesticide Network reminds everyone that in order to improve the efficacy of the drug, it is necessary to start from the above points to find the factors that limit the improvement of drug efficacy, to eliminate the unfavorable factors as much as possible, and to maximize the efficacy.
What is Oil Seal, a component of machine that seals lubricants, an oil seal is constructed of rubber,garter spring, and an internal case. While preventing the leakage of lubricants,water,or chemicals,an oil seal also prevents the entry of dust and dirt into a machine.
Oil seal also called as dynamic seal is use to prevent leakage of fluid between two components having relative rotary or sliding motion.
Skeleton oil seal is normal for a variety of mechanical bearing, especially the rolling shaft parts, to guarantee the normal work of the bearing and other pure rotational parts. its function is to put the oil cavity and the outside world, photosensitive oil sealing, sealing outside and dust.
U shaped coil is commonly used in the hydraulic cylinder seal, it is a kind of typical lip seals, whether for piston rod, can obtain good effect. Polyurethane u shaped coil is mainly used in hydraulic cylinder, it has good mechanical properties, good oil resistance, is the most commonly used in hydraulic oil cylinder, high sealing material.
Oil Seals type nomarl use TC, TB, HTCL, VC, DC, HTBR, KB, KC, SB, SC, TA, TBC, USH, LBH, UPH, ODU, IDU, WAI, DHS, UHS, UNS, UN, YX, Yx, J, JA -
The type and features of the various rubber materials used in oil seals, such as PU, TPU, CPU, NBR, HNBR, ACM, VMQ, FKM, PTFE, Fabric and so on.
Oil Seal
Oil Seal,Ptfe Oil Seal,Auto Oil Seal,Truck Oil Seal
Zhejiang Dream Industry Limited , http://www.mlwdream.com