A Study on Bio-efficacy of Dinotefuran 20% SG against Brown Plant Hopper Nilaparvatha lugens (Stall) on Paddy Oryza sativa L

Abstract

In rice cultivation, the Brown plant hopper causes damage to growth of plants by sucking cell sap and it causes in drying of plants and crop fields this effects on plant growth and turns into yellow color later brown. In order to overcome this kind of damage particularly in rice cultivation, a field trial was conducted during kharif 2017 at Agricul Research Station Gangavathi to the assess the bio-efficacy of Dinotefuran 20% SG against brown plant hopper Nilaparvatha lugens (Stall) on paddy. The results revealed that, the new insecticide Dinotefuran 20% SG 40 g a.i./ha showed lowest population of 0.86 and 0.73, 0.67 and 0.57 BPH/hill at 3, 7,10 and 15 days after spray (DAS) respectively and this treatment was significantly superior over rest of the treatments. Further, it was on par with lower dose of Dinotefuran 20% SG @ 30 g a.i./ha which is recorded 1.63, 1.60, 1.49 and 1.42 BPH/hill at 3, 7, 10 days and 15 DAS respectively, followed by standard check buprofezin @187.5g a.i./ha recorded 1.63, 1.90, 2.05and 2.15 and BPH/hill at 3, 7,10 and 15 DAS respectively. Another insecticide imidacloprid @ 22.5g a.i./ ha was found inferior to all other treatments by harbouring4.43,4.53, 4.76 and 4.87 BPH/hill, where as the untreated control recorded highest BPH population of 21.70 to 25.64 BPH/hill through out the observational period from one day before to 15 DAS respectively. The maximum additional yield was 22.37% was recorded over control (64.28 q/ha) was found in case of Treatment 4 (T4) with an incremental benefit cost ratio of 3.72.