Selection Of Compound Herbicides And Synergist For Controlling Broad Leaf Weeds In Wheat Field With Diflufenican

Wheat is an important cereal crop in our country,but it is vulnerable to many kinds of weeds in its growth,such as Galium spurium,Veronica and Descurainia sophia.Although there are many kinds of herbicides in the market,the selective resistance of weeds increases rapidly due to long-term single use,the control effectiveness of commonly used herbicides decreases rapidly,and the control of weeds becomes more and more difficult.Therefore,it is urgent to innovate the use of herbicides.In this study,Diflufenican was used as the main compound ingredient,and the appropriate compound herbicide was screened and the application dose of herbicide was optimized to effectively control weeds in wheat field and ensure wheat yield.The main research results are as follows:In this study,diflufenican was used as the main compound ingredient,and four herbicides:florasulam,oxadiazon,pendimethalin,and thifensulfuron were used as auxiliary ingredients,and the wheat was sealed before seedling after sowing.Under the same treatment,(diflufenican,florasulam,oxadiazon,pendimethalin,thifensulfuron,diflufenican·floras ulam,diflufenican·oxachlor,diflufenican·pendimethalin,diflufenican·thifensulfuron).120days after application,the closed plant control effect and closed fresh weight control effect against Veronica were 92%and 93.1%,60.2%and 65.4%,78.8%and 83.4%,72.6%and79.8%,87.6%and 89.1%,90.3%And 97.7%,88.5%and 90.0%,84.1%and 85.6%,97.3%and 98.7%,respectively;the closed plant control effect and closed fresh weight control effect against Galium spurium were 88.2%and 83.8%,83.5%and 71.7%,64.7%and 75.2%,63.5%and 77.0%,81.2%and 82.6%,95.3%and 97.9%,75.3%and 83.6%,71.8%and 82.4%,91.8%and 92.8%,respectively.The results showed that:diflufenican was used in combination with thifensulfuron and florasulam,Compared with single use,the plant control effect and fresh weight control effect of Veronica and Galium spurium weeds are significantly improved and much higher than other compound treatment groups.The compound of Diflufenican,florasulam and thifensulfuron was prepared.Seedling and early sealing treatment before overwintering of wheat.At five application doses(82.5 g ai/hm~2,123.75 g ai/hm~2,165g ai/hm~2,206.25g ai/hm~2,247.5 g ai/hm~2),90 days after application,the plant control effect and fresh weight control effect of Veronica were 75.3%and 85.4%,85.3%and 93.1%,91.8%and 96.5%,97.5%and 98.2%,100.0%and 100.0%,respectively;The plant control effect and fresh weight control effect on Galium spurium were 71.1%and 71.9%,85.4%and 88.6%,90.0%and 95.0%,95.0%and 97.8%,98.7%and 99.2%,respectively.The results showed that the plant control effect and fresh weight control effect of The combination of diflufenican,thifensulfuron and florasulam on Veronica and Galium spurium on wheat showed a gradual upward trend with the increase of the application dose,but when the application dose exceeded the critical value,the upward trend gradually eased.Based on diflufenican,it also has a good control effect on the treatment of weed stems and leaves in wheat fields.In this study,the combination of three herbicides mixed with diflufenican,florasulam,tribenuron-methyl and fluroxypyr,as well as the screening experiment of synergistic additives,found that diflufenican,triflufen-methyl and florasulam were combined Used,the control effect of 15d corrected plant,30d corrected plant and 30d corrected fresh weight of Veronica were 85.7%,86.2%,and 88.2%,respectively.Compared with the other two combinations(diflufenican+fluroxypyr+tribenuron-methyl,diflufenican+florasulam+fluroxypyr),the control effect is the best;The control effects of the herbicide combination(Diflufenican+florasulam+fluroxypyr)on Galium spurium 15d corrected plant,30d corrected plant and 30d corrected fresh weight are respectively 84.4%,87.7%,90.4%.Comparing the other two combinations(diflufenican+fluroxypyr+tribenuron-methyl,diflufenican+tribenuron-methyl+florasulam)the control effect is the best.At the same time,after adding the adjuvants HDB-D80 and JHZ-3,it was found that the control effect is better after adding HDB-D80,whether it is to the Veronica or Galium spurium.Compared with no additives,the control effect is increased by 6.6%-14.6%.