Effects of chlorantraniliprole 200SC on Cnaphalocrocis medinalis control and rice yield increase

Objective To investigate the role of chlorantraniliprole 200SC in controlling the rice leaf roller, Cnaphalocrocis medinalis, and in rice yield.

Method The effects of chlorantraniliprole 200SC on protecting rice seedlings and rice growth were studied in four different test sites of Hubei Province using field experiments. Some physiological indicators were measured, such as the number of flag leaf roll rice plant, rice tiller, leaf color and thousand-grain weight.

Result Chlorantraniliprole 200SC could effectively control rice leaf roller, promote effective tillers, decrease invalid tillers, increase kernels per spike and rice yield, but it had no obvious effects on rice leaf color, growth vigor and seed setting percentage. Compared with the negative control, overall rice seedling tillers per hill increased by 24.14% and 11.24%, with the effective ones increased by 2.01% and 3.35%, and the invalid ones decreased by 38.06% and 40.30% in the field plots treated with chlorantraniliprole 200SC and avermectin 18EC (the positive control), respectively. Compared with the negarive control, kernels per spike increased by 10.23% and 4.40%, rice yield increased by 12.72% and 7.89%, and thousand-grain weight increased by 2.68% and 1.86% in the field plots treated with chlorantraniliprole 200SC and avermectin 18EC(the positive control), respectively.

Conclusion Chlorantraniliprole 200SC has excellent insecticidal activity which is superior to the positive control avermectin 18EC, and can effectively increase rice yield.