D. Rakshith Roshan*, S.V.S. Raju and K.N. Singh
Department of Entomology and Agricultural Zoology, Institute of Agricultural Sciences, Banaras Hindu University, India.
Received on 17 July 2016 and accepted on 30 September 2016
ABSTRACT
Rice is the staple cereal crop consumed by more than 50% of world population. Its production can directly show influence on once nation’s food security, including Indian subcontinent. Nowadays the rice crop is subjected to major damage by sucking pests, especially Nilaparvata lugens (Stal) (brown plant hopper) and Nephotettix virscens (Distant) (green leaf hopper). These pests are reported to cause an annual losses of 10-70% of grain yield. Further, these pests are reported to show resistance conventional insecticides and even the new groups of insecticides also reported to show less efficacy after few repeated applications. Keeping these constraints in view, an experiment was conducted to study the efficacy of combination insecticide formulation (acetamiprid + fipronil) in comparision to their corresponding sole insecticidal treatment. Eight test insecticides viz., acetamiprid 15 + fipronil 60 WDG, imidacloprid, acetamiprid, fipronil in two formulations 5SC & 80WG, monocrotophos, chlorpyriphos were assessed. The results showed that during kharif 2013, acetamiprid + fipronil treated plots are experienced low average insect pest population of BPH (2.02) & GLH (2.33) by the end of 2nd spray and per cent reduction over control for BPH and GLH was 87.71and 88.15 respectively which is higher than any other insecticidal treatment under study. Further, imidacloprid and acetamiprid were reported as next best chemicals followed by fipronil 5SC and 80WG. The same scenario was observed during kharif 2014 which emphasizes that acetamiprid + fipronil combination will give effective results for management of BPH & GLH than their corresponding individual insecticidal applications.
Keywords:
brown plant hopper, green leaf hopper, bio-efficacy, neonicotinoids, phenyl pyrazole.