Efficacy of Biorational Insecticides Against Major Insect Pests of Rice

Author: P. Udayababu, P.V. Satyanarayana, K. Madhu Kumar and D. Manoj Kumar

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Abstract

Effective pest management in rice is essential for sustaining crop yields and minimizing economic losses in agriculture. Integrated Pest Management (IPM) strategies typically combine plant-based botanicals and chemical insecticides to manage pest populations. This study was conducted to assess the effectiveness of various botanicals, insecticides, and their combinations against key rice pests during the Kharif seasons of 2019, 2020 and 2021 at the Agricultural Research Station in Ragolu, North Coastal Zone, Andhra Pradesh. The experiment involved five treatments, each comprising different combinations of botanicals and insecticides, including: Neemzal 1% EC at 25-30 DAT + Eucalyptus oil at 45-50 DAT + Cartap hydrochloride 50%SC at 60-65 DAT; Neemzal 1%EC at 25-30 DAT + Neem oil at 45-50 DAT + Triflumezopyrim at 60-65 DAT; an all-botanicals treatment with Neemzal 1%EC at 25-30 DAT, Neem oil at 45-50 DAT, and Triflumezopyrim at 60-65 DAT; an all-insecticides treatment with Chlorantraniliprole 0.4G at 25-30 DAT, Cartap hydrochloride 50%SC at 50-55 DAT, and Triflumezopyrim at 65-70 DAT and an untreated control for comparison. All treatments significantly reduced pest populations compared to the control, owing to their specific modes of action. The results indicated that the combination of Chlorantraniliprole 0.4G at 25-30 DAT + Cartap hydrochloride 50%SC at 50-55 DAT + Triflumezopyrim at 65-70 DAT was most effective, showing lower percent damage of leaves and white ears at pre-harvest, reduced incidence of BPH and WBPH, and higher grain yields. The treatment with Neemzal 1%EC at 25-30 DAT + Neem oil at 45-50 DAT + Triflumezopyrim at 60-65 DAT also resulted in improved grain yields. Overall, the pre-mixed insecticides outperformed individual insecticides in controlling pests

Keywords

Bio-efficacy, Botanicals, Dead hearts (DH), Damaged leaves (DL)Insecticides, Silver shoot (SS), White ear head (WE)

Conclusion

The three-year experimental trials demonstrated that among the five treatments in the Insecticide-Botanicals Evaluation Trial (IBET), the application of Chlorantraniliprole 0.4G at 25-30 DAT + Cartap hydrochloride 50% SC at 50-55 DAT + Triflumezopyrim at 65-70 DAT resulted in the lowest percentage of damaged leaves and white ears at pre-harvest, along with a reduced incidence of BPH and WBPH. This treatment also achieved the highest grain yield of 6668 q/ha. The next best treatment was Neemzal 1% EC at 25-30 DAT + Neem oil at 45-50 DAT + Triflumezopyrim at 60-65 DAT, which produced a grain yield of 5943 q/ha. All treatments showed significantly lower percentages of damaged leaves and white ears, reduced pest incidence, and higher grain yields compared to the control

References

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How to cite this article

P. Udayababu, P.V. Satyanarayana, K. Madhu Kumar and D. Manoj Kumar (2023). Efficacy of Biorational Insecticides Against Major Insect Pests of Rice. Biological Forum – An International Journal, 15(6): 966-971