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Seasonal Incidence of Leaf Roller, Sylepta derogata (Fabricius) in Cotton

Author: Dalsaniya N.S., Patel R.D., Bhanderi G.R., Desai H.R. and Rathod T.R.

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Abstract

Study on seasonal incidence of leaf roller, Sylepta derogata F. was carried out on non-Bt cotton hybrid. Leaf roller activity initiated in fifth week of July (31st SW) and it continued till the fourth week of December (52nd SW). The peak incidence was observed in first week of October (40th SW) and again in fourth week of October (43rd SW). Correlation studies indicated that maximum temperature had significant positive association with larval population (r = 0.439*) and rolled leaves (r = 0.469*) and non-significant positive correlation with damaged leaves (r= 0.234). The leaf roller larval population, rolled leaves and leaves damage had non-significant negative association with morning relative humidity (r = -0.166, -0.302 and -0.045), rainfall (r = -0.215, -0.309 and -0.124) and rainy days (r = -0.237, -0.357 and -0.052), respectively. Non-significant positive correlation with minimum temperature (r = 0.033, 0.114 and 0.243), evening relative humidity (r = 0.107, 0.005 and 0.323) and bright sunshine hours (r = 0.314, 0.422 and 0.106), respectively

Keywords

Cotton, Leaf roller, S. derogata, Correlation, Population dynamics.

Conclusion

The leaf roller population incidence commenced from fifth week of July (31st SMW) and it continued till the fourth week of December (52nd SMW). The peak activity of leaf roller was observed in first week of October (40th SMW) and again in fourth week of October (43rd SMW) and then population gradually declined. Correlation of pest infestation with weather parameters showed that only maximum temperature had significant positive association while, minimum temperature, evening relative humidity and bright sunshine hours had non-significant positive correlation and non-significant negative association with morning relative humidity, rainfall and rainy days

References

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How to cite this article

Dalsaniya N.S., Patel R.D., Bhanderi G.R., Desai H.R. and Rathod T.R. (2024). Seasonal Incidence of Leaf Roller, Sylepta derogata (Fabricius) in Cotton. Biological Forum – An International Journal, 16(4): 85-89.