Chemical control techniques of polyflorum ryegrass in winter wheat field

2022-06-07 0 By

World Agrochemical Net Chinese website reported: in recent years, wheat field multiflorated ryegrass has occurred in many places in the country, henan Province and other areas are rampant, rapid development, this grass tiller fertility is strong, the occurrence density in the field is generally large, glossy leaves, strong drug resistance.Through a series of experiments in multiple fields and follow-up investigation on the effect of farmers’ field use, THE author analyzed, summarized and shared the following, to provide reference for pesticide marketing and promotion and farmers’ drug use: 1. Technical points for the prevention and control of multiflorated ryegrass; 2.More than 90%-95% of ryegrass before the year has generally emerged. The weeds applied before the year are small and resistant, so the effect can be 100% by selecting the right combination of agents and application technology, while the application after the year is difficult to be thorough.2. Iproderone is indispensable for post-seedling medicine, which belongs to the variety of balm in the prevention and control of multiflorated ryegrass in winter wheat field.The effect of ipropron is also good when used as a single agent, but the temperature of application is relatively low before the New Year, and there is a certain risk of harm in case of low temperature or cold current. Therefore, it is recommended that the dosage of ipropron be controlled and mixed with methyl disulfuron or azoline ester in barrels.3, the application of medicine after seedling should be early rather than late;The drug resistance of multiflorant ryegrass will increase exponentially after tillering, so it is necessary to master the use of drugs before tillering, generally 15-25 days after wheat sowing in good weather conditions.4. For wheat fields with high density of multiflorated ryegrass in previous years, or whose control effect is not ideal in previous years, it is recommended to seal before seedling + post seedling treatment, which can be closed before seedling or early after seedling to reduce the weed base. Generally, the number of multiflorated ryegrass can be reduced by 30-70%.When soil moisture is good and medication is appropriate, the sealing effect is more favorable.At the end of 2021, some fields in Zhumadian city were sealed with varieties or combinations such as fluthiazolide or sulfenpyrazole. In the later stage, a large number of ryegrass seedlings emerged, but the sealing effect was poor.Of course, there are also better sealing effect.Reference for selection of blocking agents :(1) sulfenpyrazole, the recommended dose of 10-15 grams of pure drug/mu, after sowing before seedling application;(2) Fluthiacholide, recommended dose of 25-40 g pure drug/mu, after sowing before seedling application;(3) Isoproflon + pyrazuramide, the recommended dose: isoproflon 50-65 g pure drug/mu + pyrazuramide 8-12 g pure drug/mu, after sowing before seedling to early post seedling when weeds stand needle stage.(4) Sulfenpyrazole, fluthiachlor and isoproderone can also be mixed in two barrels at the above dosages for wheat after sowing and before seedling.1. Isoproderone 50-65 g pure drug/mu + methyl disulfurone 0.6-0.7 g pure drug/mu;This combination has a wide killing spectrum and is effective to almost all gramineae weeds in wheat fields.If the field grass grass phase is complex, or there is a joint wheat in the field, this combination of drugs is preferred.This formula is also preferred when the crop wheat occurs locally and the distributor is not sure whether the crop wheat exists in the farmer’s field.2. Isoproderone 50-65 g pure drug/mu + Azoline grass ester 5-6 g pure drug/mu;The safety of this combination is slightly better than the above combination of iproteron + A 2, and it has higher cost performance in the control of multiflorum ryegrass, but it is ineffective to the joint wheat. If there are no insensitive weeds such as joint wheat in the field, this combination can be preferred.3, isoproderone 50-65 g pure drug/mu + methyl disulsulfonon 0.6-0.7 g pure drug/mu + azoline grass ester pure drug 5-6 g/mu is a more reliable formula, the effect and safety are relatively reliable.At this time, it is necessary to refer to the formula of applying medicine after the seedling before the above year, and the amount of medicine should be increased 1.2 to 1.5 times as appropriate. When the multi-flower ryegrass is older or more dense, it can be increased to 1.5 times, that is, the original barrel of water before one mu of land can be used 7 minutes after the year.It can play a better effect and control the occurrence of drug harm.However, it is difficult to achieve a complete effect after the New Year, and the control effect of 1.5 times the dose in resistant areas can only reach 10%, and the control effect of fresh weight is 60-80%.1. Isopropyl, methyl disulfurone and azoline are easy to cause harm to wheat under the condition of low temperature cold current and heavy rain, so the dosage of them should not be increased at will, especially the former two.2. Fluzsulonon is generally not recommended for the control of multiflorum ryegrass after seedling, because the effect of fluzsulonon on multiflorum ryegrass is very poor and almost ineffective.3, field mixed wild oats, methyl disulfonon can be mixed with acetylene ester, methyl disulfonon and acetylene ester have synergistic effect.Author: Huang Shijin