author(s)
D Sudha Rani and M Praveen Kumar

abstract
The major production constraint of rice production is attack by pests and diseases. Among all the pests, the sucking pests viz., brown plant hopper (BPH), WBPH (white backed plant hopper), GLH (green leafhopper) and rice bug (RB) can cause economic losses extending up to 95 per cent. In case of severe pest incidences the usage of insecticides is inevitable. But, regular usage of chemicals with same mode of action may led to pest resistance, resurgence residual effect. Hence, alternate chemicals are need of the hour with no phytotoxic levels. Hence, studies on efficacy pertaining to coded product PII 1721 at different concentrations along with check chemicals and untreated control were evaluate at Agricultural Research Station, Garikapadu for two seasons during Rabi and Summer (late Rabi) 2017-18 to assess the efficacy of various insecticides in suppressing the population buildup of sucking pests infesting rice. The experimental trial was laid out with eight treatments that were replicated thrice and two spraying were imposed during the entire crop period at tillering at panicle initiation stage, respectively. The data on number of BPH, WBPH, GLH and RB per hill were recorded at 3, 7, 10, 15 and 20 days after spray and pooled the two sprays and analyzed the observations using SPSS statistical package. The results revealed that, among the various treatments evaluated for efficacy, the treatment T₃ (PII 1721 60% WG @200 g a.i. ha^-1) was found effectual in suppressing the sucking pest population during both the seasons evaluated and the next better treatment in order of efficacy was T₇ (Pymetrozine 50% WG @ 150g a.i. ha^-1). None of the treatments exhibited phytotoxic effect on the plant.