Relative Toxicity of New insecticide Molecules against Rice Leaf Folder and Brown Plant Hopper and their effect on Natural Enemies

Author: S.D. Mohapatra, Munmun Mohapatra and Swoyam Singh

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Abstract

In the recent years, new selective insecticides non-toxic to natural enemies has enhanced the pest management efficiency and safe guarding the crop ecosystem. Moreover, pesticides with single active principle are likely to induce the development of resistance in insects. The present experiment on the newer molecules were conducted during kharif 2019 and rabi 2020 to assess the relative toxicity of triflumezopyrim 10% + spinetoram 12% WDG (22%) WDG against rice leaf folder and brown plant hopper and their study on safety to natural enemies. The experiment was comprising of seven treatments viz., T1: Triflumezopyrim 10% + spinetoram 12% (22%) WDG@ 44 g ai ha-1; T2: Triflumezopyrim 10% + spinetoram 12% (22%) WDG @ 55 g ai ha-1; T3: Triflumezopyrim 10% + spinetoram 12% (22%) WDG @ 66 g ai ha-1; T4: Triflumezopyrim 10.6% SC@ 25 g ai ha-1; T5: Spinetoram 12% SC @ 30 g ai ha-1; T6: Fipronil 5% SC @ 75 g ai ha-1; T7: Untreated Control. The lowest BPH population was recorded in triflumezopyrim 10% + spinetoram 12% (22%) WDG @ 66 g aiha-1 which are statistically at par with triflumezopyrim 10% + spinetoram 12% (22%) WDG @ 55 g aiha-1 throughout the observation. Similarly, lowest leaf folder damaged leaf (LFDL) was recorded in triflumezopyrim 10% + spinetoram 12% (22%) WDG @ 66 g aiha-1. Triflumezopyram 10% + spinetoram 12% (22%) WDG @ 55 g aiha-1 provided effective control of leaf folder and brown plant hopper. Further, triflumezopyrim 10% + spinetoram 12% (22%) WDG@ 55 g aiha-1 was found to be safe to the predatory mirid bug, Cyrtorhinus lividipennis and wolf spider, Pardosa pseudoannulata in rice ecosystem.

Keywords

Toxicity, triflumezopyrim, spinetoram, leaf folder, brown plant hopper, natural enemies, rice

Conclusion

The present investigation on relative toxicity of triflumezopyrim 10% + spinetoram 12% (22%) WDG conducted during kharif, 2019 and rabi 2020 showed that triflumezopyrim 10% + spinetoram 12% (22%) WDG provided effective control of leaf folder and brown planthopper. Further, triflumezopyrim 10% + spinetoram 12% (22%) WDG @ 55g ai ha-1 has no significant difference with triflumezopyrim 10% + spinetoram 12% (22%) WDG @ 66g ai ha-1 w.r.t. safety to the predatory mirid bug, Cyrtorhinus lividipennis and wolf spider, Pardosa pseudoannulata and grain yield. Hence, triflumezopyrim 10% + spinetoram 12% (22%) WDG@ 55 g aiha-1 may be recommended to manage leaf folder and brown planthopper in rice.

References

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How to cite this article

S.D. Mohapatra, Munmun Mohapatra and Swoyam Singh (2022). Relative Toxicity of New insecticide Molecules against Rice Leaf Folder and Brown Plant Hopper and their Effect on Natural Enemies. Biological Forum – An International Journal, 14(4): 211-216.