Pymetrozine 50 wg: a novel insecticide against rice planthoppers Suri K. S.1,*, Makkar Gurpreet Singh Department of Entomology, Punjab Agricultural University, Ludhiana, 141004 1Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, 141004 *Corresponding author Email: kssuri@pau.edu
Online published on 5 February, 2019. Abstract Bioefficacy of pymetrozine, a novel insecticide belonging to pyridine azomethines in suppressing the brown planthopper (BPH), Nilaparvata lugens (Stal.) and whitebacked planthopper (WBPH), Sogatella furcifera (Horvath) populations infesting rice was evaluated in multilocation research trials under agroclimatic conditions of Punjab. Pymetrozine 50WG @ 125, 150 and 175 g a.i. ha−1 was compared with the checks, imidacloprid 17.8 SL and quinalphos 25 EC applied @ 20 and 500 g a.i. ha−1, respectively. Pymetrozine @ 150 and 175 g a.i. ha−1 (with 2.83 and 2.74 hoppers/hill, respectively) proved significantly better than imidacloprid and quinalphos (with 5.69 and 5.27 hoppers/hill, respectively) in controlling the BPH at 7 days after spray (DAS) at all the experimental locations. The BPH population at 10 DAS in pymetrozine @ 150 g a.i. ha−1 (2.89 hoppers/hill) and 175 g a.i. ha−1 (2.85 hoppers/hill) was significantly lower than that in the checks, imidacloprid and quinalphos (7.71 and 7.02 hoppers/hill, respectively). The test insecticide also proved significantly superior to the checks, in controlling the WBPH. Nonsignificant differences were recorded among the spiders population in various treatments indicating safety of new molecule towards non-target organisms. Hence, pymetrozine 50 WG @ 150 g a.i. ha−1 offers a potential chemical line of defence for the control of rice planthoppers. Top Keywords Pymetrozine 50 WG, field efficacy, rice, Nilaparvata lugens, Sogatella furcifera, imidachloprid, quinalphos, grain yield. Top |