The problem of weed resistance in wheat fields is still very serious; malignant weeds continue to multiply and the area expands year by year; the amount of herbicides continues to increase, and the formula is replaced again and again. On the one hand, the broad-leaved weeds "sowed wormwood, leeks" have increased resistance, it is an indisputable fact, "porcine sputum" also seems to have a tendency to resist, benzene · benzyl formula is used less, "diflufenacil "In the past two years, the amount has increased year by year, and it has become a good partner for all kinds of compounding agents. "Zoprosin" is infinitely vital and wins quickly. The formula of “diflufenazone + oxacillin†is popular, which can prevent and cure malignant weeds, resistant worms, leeks, and low temperature, and kill grass quickly! However, there is no universal medicine. This formula is only effective against the current malignant weeds. Therefore, in practice, it is necessary to apply the herb according to the grass phase, and continuously observe the resistance index to facilitate timely adjustment of the formula. The area of ​​weeds is increasing year by year. The headache is that the grass is temporarily free of cure. The only effective "methyl disulfuron" is highly susceptible to phytotoxicity. In the past two years, most of the farmer's plots of broadleaf weeds and grass weeds have mixed, and the market potential of mixed single and double mixed pesticides is very large. Then the problem comes, whether all the herbicides and control of broadleaf weeds are controlled. Can herbicide weeds can be mixed? Is the additive or synergy between the agents, or the antagonistic reaction occurs, is it safe for the crop? The author also observed a lot of experiments, which are summarized below for reference only. Effect of diflufenazone + oxazolone "Benzsulfuron-methyl" is one of the earliest herbicides for controlling broad-leaved weeds in wheat fields. After decades of application, the control effect on pig mites, sage, and leeks decreased, especially for the resistance-resistant wormwood. Even if the amount of leek is increased to the original ten times, there is no control effect, and the market share is getting less and less. At present, "diflufenacil" can effectively prevent pig mites and leeks, and can effectively inhibit the wormwood, "oxaza Ketone has certain control effect on the resistance-producing sage, amaranth, and the speed of dead grass is fast, but it is easy to rebound. The combination of the two greatly reduces the chance of recurrence of weeds and expands the spectrum of killing. The test field shows that "10% oxalofenone WP12g + 5% diflufenacil SC10g / mu" can effectively control the weeds in the field and is safe for wheat. Observability is strong, pre-observation, 3-5 days after the drug, the performance of the female worm is symptomatic, and the anti-efficacy is over 95%. In addition to the recurrence and rebound of some large plant-type sage, it is very important to recommend the drug. Grass 3-5 leaf stage for prevention and control). Methyl disulfuron-methyl on the control of wheat and the symptoms of wheat phytotoxicity In the past two years, there has been a large amount of “A section of wheat†in various regions. It is difficult to distinguish between seedling and wheat. The stalks of the wheat stalks are tightly clasped with cilia on the edges. The leaves have long cilia at the edges, and the leaves are thin, with leaves and sheaths. The hair has long cilia and the base of the stem is reddish. As shown in the following figure, the wheat and wheat seedlings compete for light, which seriously affects the growth of wheat, causing the yield to drop. When harvesting, the grain is mixed in the wheat, affecting the quality, such as used for seed production. Growing more knots, the peasants are miserable! However, the current "methyl disulfuron-methyl" which is effective against the section of wheat is highly susceptible to phytotoxicity when it is used improperly (cold weather, water accumulation, high dose, heavy spray, etc.). Symptoms of wheat phytotoxicity: new leaves are twisted and leaves are yellowed (temporary yellowing or dwarfing may occur in the early stage of wheat. Under normal conditions of use, the phenomenon of yellowing naturally disappears after the body starts to rise. If the wheat is seriously damaged, even the dead seedlings appear. Phenomenon), the plant is dwarfed. If the disease occurs in wheat with methyl disulfuron-methyl, it should be treated in time, spray foliar fertilizer or conditioner, and the amount of water can be increased when spraying. To some extent, the symptoms of wheat damage can be reduced. The resistance of winter wheat varieties is greater than that of spring wheat varieties. Most of the silty (soft or weak) varieties are more resistant than some hard types such as keratin (semi-hard or semi-strong) and sandy land. The local phytotoxicity of the seedlings is relatively serious. "Methyldisulfuron" has good control effect on "A section of wheat". If it can overcome its phytotoxicity problem, "methyl disulfuron" will be a very good herbicide, and the market share will be even greater. In the past, many farmers have had methyl disulfuron-methyl phytotoxicity in the field, but with the increase of the number of wheat, there is no way to do it. Therefore, the use of methyl disulfuron has increased in the past two years. In fact, the low-dose methyl disulfuron is relatively safe. Observing the weather conditions within a week before using the drug and then rationally applying the drug can avoid the occurrence of phytotoxicity. However, in the actual promotion, the distributor failed to slap the farmers one by one. In the process of using the peasants, according to the habits, the mentality of “multiple sprays can be sprayed to avoid bad effectsâ€, thus increasing the incidence of phytotoxicity. "Methyldisulfuron-methyl" is basically used to fight the dying of wheat after the year (Note: after the year, the wheat straw is large, with many branches and strong drug resistance), but it will inhibit the growth of wheat, and the jointing of wheat after heading Keep it underneath, no longer grow, reducing the impact on wheat yield. Methyldisulfuron-methyl phytotoxicity at different doses The dosage of 30 g / liter of methyl disulfuron-dispersible oil suspension in the field was 20 ml, 30 ml, 40 ml / mu, respectively. It can be seen that 40 ml / mu of methyl disulfuron is prone to phytotoxicity, 20 ml and 30 ml / The acres are relatively safe. The use of methyl disulfuron-methyl is controlled by Maijiagong. It can be seen that methyl disulfuron has a certain inhibitory effect on Maijiagong, and the sprayed Maijiagong has blossomed, and no medicine can prevent it. Effect and safety of different herbicides Methyl disulfuron-mixed oxazolone can achieve the effect of broadening and double-dividing. The dosage of methyl disulfuron is 20ml/mu, and the control effect is poor. When the dosage is 30ml/mu, the control effect is better. However, in the actual application process, it is not recommended to use the compounding, and it is easy to produce phytotoxicity if it is used improperly. Methyl disulfuron can not effectively prevent common wild oats. At present, the herbicide with better control effect on wild oat is clodinafop, which is difficult to prevent for the mixed plot of wheat and wild oats. The combination of wheat (with methyl disulfuron) and wild oat (with acetylene) is effective, and it is obvious from the test field that the combination of the two is mixed with wheat and wild oats. The effect is poor, so it is not recommended to mix the two during use. In addition, when mixed with herbicides, it is not recommended to mix oxazolone with oxazol and chlorpyrifos, which is highly prone to phytotoxicity, causing yellowing of the wheat tip and small yellow spots on the leaves, although the yield reduction is not serious, but the quality is affected. The sale is not good. However, the combination of oxazolone and clopidogrel is lighter (the symptoms of phytotoxicity: yellowing of new leaves), which can be mixed, but pay attention to the respective dosages to avoid re-spraying. Weeding is important, and protecting wheat is more important. In order to fully grasp the scientific use of weeds, we must first understand the wheat varieties, weather conditions, dosage, and techniques (do not re-spray and leak spray, observe the grass and apply the medicine, look for the application period). Understand the effects of mixing of various chemicals, timely treatment of phytotoxicity, minimize losses! Safe weeding, reasonable application. More pesticide knowledge , please pay attention to China Pesticide Network
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What is the efficacy and safety of diflufenone, methyl disulfuron and its compounding agents?