Cloransulam-methyl combined with imazapic for effective control of Cyperus rotundus and their safety in alfalfa
To clarify the feasibility of cloransulam-methyl and imazapic in alfalfa fields,their control efficacy on Cyperus rotundus and safety to alfalfa were investigated in greenhouse and field conditions.The greenhouse experiments showed that the combination of cloransulam-methyl and imazapic had a good control effect on C.rotundus.For the ratios of active ingredient dosage from 1꞉2 to 1꞉4,the co-toxicity coefficient on the plant height and fresh weight of C.rotundus ranged from 131.54 to 150.46 and 152.84 to 180.25,respectively,exhibiting a distinct synergistic effect.Among the tested combinations,synergy was the most for the 1꞉3 ratio,and the selectivity indexes of plant height and fresh weight between alfalfa and C.rotundus were 1.86 and 1.56,respectively.The field test results showed that the effectiveness of treatments ratios of cloransulam-methyl and imazapic(17.50 + 52.50)～(25.00 + 75.00)g·ha-1 on alfalfa plants in Zhengzhou and Lankao were 78.5%～88.5%and 82.1%～90.8%,respectively,and 83.4%～92.7%and 84.7%～93.6%for fresh weight,respectively,with yield increase rates of 28.8%～35.1%and 30.5%～38.3%,respectively,which were significantly higher than those of cloransulam-methyl or imazapic alone.These results help address the challenge of drug damage by cloransulam-methyl and imazapic alone.The combination of imazapic and cloransulam-methyl can thus effectively prevent and control C.rotunduswith improved safety to alfalfa and has good prospects for promotion and application.
plant heightfresh weightherbicide damagecontrol effectsynergistic effectco-toxicity coefficientselectivity index
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