除草剂涂抹紫茎泽兰不同部位的效果

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以甲嘧磺隆1500 mg/kg、3000 mg/kg,胺氯吡啶酸4200 mg/kg、8400 mg/kg,用自制的长、宽、高为3cm×5 cm×3 cm的小海绵浸过药液后,分别轻抹于紫茎泽兰的顶端、中部、下部叶片和茎部。药后13 d、33 d、55d,药剂涂于紫茎泽兰顶端叶片的防除效果显著高于涂中部、下部叶片和茎部。在上述药剂的低浓度处理中,加入5%机油乳油可提高对紫茎泽兰的防除效果。
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