Survey and Seasonal incidence of Pink Bollworm Pectinophora gossypiella (Sounders) in Bt Cotton Growing areas of North Gujarat

Author: Dinesh K. Chaudhari, Bindu K. Panickar and M.K. Chandaragi

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Abstract

To determine the extent of damage caused by pink bollworm at various stages of the cotton crop the survey was undertaken. In Bt cotton growing areas of Banaskantha district of North Gujarat. Among the villages surveyed for the presence of pink bollworm, all the nine villages of Deesa, Deodar and Kankrej talukas of Banaskantha district of North Gujarat consisting of semi arid climate, recorded its incidence during kharif 2019. The maximum flower, locule and boll damage were recorded at Raiya village of Deodar (16.53, 17.19 and 30.00 %) and minimum flower, locule and boll damage were recorded at Thervada village of Deesa (11.86, 12.12 and 19.20 %, respectively). Seasonal incidence of pink bollworm at Sardarkrushingar in Dantiwada taluka revealed that the infestation of the pest and its activity were observed from second week of September to fourth week of December. The rosette flower damage appeared from second week of September (2.32 %), while the larval population initiated from fourth week of September (1.2 larvae/10 unopened bolls). The flower damage and larval population were maximum (14.28 % and 7.8 larvae/10 unopened bolls) during the second week of November and fourth week of November, respectively. The opened boll damage ranged from 35.00 to 40.55 per cent and maximum (40.55 %) during 4th week of November, while the locule damage varied from 19.28 to 22.77 per cent and maximum (22.77 %) locule damage were observed during 4th week December. Correlation between larval population of pink bollworm and weather parameters indicated that significantly negative correlation with morning relative humidity and rainfall.

Keywords

Survey, incidence, pink bollworm, cotton

Conclusion

The survey for pink bollworm in cotton growing areas revealed that lowest flower, locule and boll damage was recorded at Thervada village of Deesa (11.86, 12.12 and 19.20 %). Its seasonal incidence revealed the maximum flower damage and larval population (14.28 % and 7.8 larvae/10 unopened bolls) recorded during second week of November and fourth week of November. The opened boll damage was maximum (40.55 %) during 4th week of November and highest locule damage (22.77 %) was observed during 4th week December. Correlation studies between larval population and weather factors shown that significantly negative correlation with morning relative humidity and rainfall.

References

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How to cite this article

Dinesh K. Chaudhari, Bindu K. Panickar and M.K. Chandaragi (2023). Survey and Seasonal incidence of Pink Bollworm Pectinophora gossypiella (Sounders) in Bt Cotton Growing areas of North Gujarat. Biological Forum – An International Journal, 15(9): 682-686.