This study aimed to screen safe and effective post-emergence herbicides in fields of Hibiscus cannabinus.We investigated the influence of six post-herbicides on the rate of abnormal seedlings,estimated the selectivity of six post-herbicides via dray weight of H.cannabinus bast,plant height,stem thick and fresh weight of H.cannabinus,and explored plant control effect and fresh weight control effect of weeds.And the six post-herbicides were bentazone 480 g/L AS,fluoroglycofen-ethyl 10％EC,fomesafen 25％AS,quizalofop-ethyl 8.8％EC,sethoxydim 12.5％EC and clethodim 120 g/L EC in this study.The results showed that the selectivity of bentazone 480 g/L AS and clethodim 120 g/L EC presented excellent.The dry weight of H.cannabinus applied bentazone 480 g/L AS and clethodim 120 g/L EC were slightly lower than that applied the water control.The malformed seedling rate of H.cannabinus applied bentazone 480 g/L AS at 1.5 kg/hm2 was 1.33％.After 40 days,the control effect on fresh weight of broad-leaved weed was 81.21％,and the control effect on plant was 80.53％.The malformed seedling rate of H.cannabinus applied clethodim 120 g/L EC at 0.525 kg/hm2 was 0.After 40 days,control effect on fresh weight of grassy weed was 80.68％,and control effect on plant was 80.94％.Fluoroglycofen-ethyl 10％EC and fomesafen 25％AS had non-selectivity and lower dry weight of H.cannabinus.Malformed seedling rate was significantly higher than that of mirabilin 480 g/L AS.After 40 days,control effect on fresh weight and plant of the Gramineae applied quizalofop-P-ethyl 8.8％EC and fenpropafenone 12.5％EC were significantly lower than that of enoxazone 120 g/L EC.On the growth of H.cannabinus,bentazone 480 g/L AS is suitable to control broad-leaved weeds,while clethodim 120 g/L EC is suitable to control grassy weeds.
Hibiscus cannabinuspost-emergence herbicideselectivitycontrol effect on plantcontrol effect on fresh weight
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