Efficacy of Chlorantraniliprole 35 WG against Borers of Sugarcane

Abstract

Two field experiments were conducted to study the bioefficacy of chlorantraniliprole 35 WG against sugarcane borers at Sugarcane Research Station, Cuddalore during 2015-2017 in randomized block design with seven treatments replicated thrice with a plot size of 50 m2 per replication. Applications of insecticides were made at the time of planting in furrow for early shoot borer (ESB) management followed by drenching at 90-92 days after planting (DAP) for internode borer and other pests. Germination of sugarcane setts was recorded at 30 DAP in each treatment. ESB infestation was observed at 30, 60 and 90 DAP and internode borer infestation was observed on 120, 150 and 180 DAP. The population of coccinellid beetles was observed at weekly intervals after second application and the phytotoxicity rating was observed at x (75 g a.i. ha-1), 2x and 4x doses. The results revealed that the mean per cent damage of early shoot borer was found significantly lower in chlorantraniliprole 35 WG @ 88 g a.i. ha-1 than other treatments in all the periods of observation and on par with chlorantraniliprole 35 WG @ 75 g a.i. ha-1 and chlorantraniliprole 18.5 SC @ 75 g a.i. ha-1. The per cent germination observed at 30 DAP revealed that chlorantraniliprole 35 WG did not cause any impact on the germination of sugarcane setts in both trials. At all the test doses there was no significant reduction in the population of coccinellids in the field and at x, 2x and 4x doses did not show any phytotoxicity symptoms in the sugarcane crop. Hence, it is concluded that, chlorantraniliprole 35 WG @ 75 g a.i. ha-1 effectively controlled the early shoot borer and internode borer infestation in sugarcane ecosystem