Studies on Seasonal Dynamics of Pink Bollworm, Pectinophora gossypiella (Saunders) on Bt Cotton

Author: Gangappa Nayak, S. B. Patil, D. N. Kambrekar and Shamarao Jahagirdar

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Abstract

The field experiments were carried out in the farmer field of Somapur village (Dharwad taluka) during Kharif 2018-19. The peak moth activity was observed during the first week of December 46th meteorological standard week (421.50 moths / trap/week). Later the activity of moths declined gradually and become to its negligible level at December 4th week (49th MSW). The rosette flowers were ranged from 2.61 to 19.54 per cent with seasonal mean of 10.18 per cent. However, pink bollworm incidence in green bolls was noticed from the first fortnight of September (34th MSW) and increased gradually to reach its peak during the first fortnight of December (46th MSW). Total larval incidence was ranged from 5 to 81 larvae/50 bolls with a mean of 44.62 larvae /50 bolls and the green boll damage ranged from 6 to 54.00 per cent with mean of 28.25 per cent. Moreover, open boll damage was ranged from 33.58 to 41.27 per cent with a mean of 36.32 per cent during the cropping season. Furthermore, locule damage ranged from 24.50 to 48.50 per cent with mean of 35.87 per cent.

Keywords

Cotton, Pectinophora gossypiella (Saunders), Sleeve trap, Moth, Boll damage

Conclusion

The seasonal dynamic studies helped in regarding pest appearance and its infestation at early stage of cropping period so, that helped to take up preventive measures to avoid the anticipatory crop loss.

References

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How to cite this article

Gangappa Nayak, S. B. Patil, D. N. Kambrekar and Shamarao Jahagirdar (2023). Studies on Seasonal Dynamics of Pink Bollworm, Pectinophora gossypiella (Saunders) on Bt Cotton. Biological Forum – An International Journal, 15(10): 371-374.