4种除草剂防除保护性耕作麦田早熟禾效果及其对作物的安全性

通过田间试验，比较4种除草剂药后不同时期对保护性耕作麦田早熟禾的防效及其增产效果，进而比较7．5％啶磺草胺WG、3．6％甲基二磺隆·甲基碘磺隆钠盐WG、15％炔草酸WP、6．9％精唑禾草灵EW 4种除草剂防除早熟禾效果和对小麦的安全性。采用田间药效试验方法，对麦田早熟禾采用喷雾处理，进行4种除草剂防除麦田早熟禾效果及其对作物的安全性试验。7．5％啶磺草胺WG 187．50 g/hm2和3．6％甲基二磺隆·甲基碘磺隆钠盐WG 450．00 g/hm2对早熟禾鲜质量防效分别为83．58％、84．87％。3．6％甲基二磺隆·甲基碘磺隆钠盐WG对春小麦通麦1号品种有一定的药害，药害程度：甲基二磺隆·甲基碘磺隆钠盐＞啶磺草胺。6．9％精唑禾草灵EW、15％炔草酸WP对早熟禾达未到防治要求。187．50 g/hm27．5％啶磺草胺WG，安全性好、防效高、持续期长，可进一步示范推广使用。

Efficacy and Selectivity of Four Herbicides on Poa annua L. in Spring Wheat

The efficacy of formulated pyroxsulam 7.5%WG,mesosulfuron plus idosulfuron 3.6%WG,fenoxaprop 6.9%EW,and clodinafop-propargyl 15%WP to control Poa annua and their selectivity to wheat were studied under field con-ditions.Pyroxsulam 7.5%WG （187.5 g hm2 ） and mesosulfuron plus idosulfuron 3.6% WG （450 g hm2 ） controlled 84%and 85% P.annua,respectively,based on fresh weight determinations.Both herbicide treatments were highly se-lective to spring wheat cv.Tongmai 1 although mesosulfuron plus idosulfuron caused slight crop phytotoxicity.Fenoxaprop and clodinafop-propargyl did not provide adequate control of the grass weed.Given the efficacy,selectivity and long-term control provided by pyroxsulam 7.5%WG at 187.5 g hm2 ,its use can be recommended in the field.