Potential of igr based bio-pesticides in controlling rice brown planthopper, Nilaparvata lugens (stål)
Md. Jahangir Alam Gopal Das
Field performance of two insect growth regulators (IGR) viz. Award 40 SC (Buprofezin) and Haron 5 EC (Lufenuron) and one newer Thiacloprid viz. Calypso 280 SC against Nilaparvata lugens (Stål) was observed in the Entomology field laboratory, Bangladesh Agricultural University, Mymensingh. The treatments were evaluated on reduction of BPH populations and grain yield (t/ha). At 7 DAT, both IGRs (Award 40 SC: 3.73 hill-1, Haron 5 EC: 5.32 hill-1) and Thiacloprid (Calypso 280 SC: 5.13 hill-1) were found very effective on the reduction of BPH populations (number) with their maximum doses in comparison with that of control (42.90 hill-1). The similar trend was also found in case of grain yield (Award 40 SC @ 0.75 ml/L: 4.8 t/ha; Haron 5 EC @ 1.5 ml/L: 4.72 t/ha; Calypso 280 SC @ 1.00 ml/L: 4.71 t/ha). It is concluded from the present study that Award 40 SC @ 0.75 ml/L or Haron 5 EC @ 1.00 ml/L would be applied to control BPH populations effectively. Although Calypso 280 SC was also found effective on the reduction of BPH populations as well as increasing grain yield but its uses would not be judicious against BPH considering the adverse effects on available components in rice-ecosystem as well as in environment.