INFLUENCE OF WEATHER ON THE PROGRESS OF CORYNESPORA LEAF SPOT IN COTTON
DOI:
https://doi.org/10.48165/jpds.2025.20.01.10Keywords:
Cotton, Corynespora leaf spot, Phonological stage, Weather parametersAbstract
Corynespora leaf spot in three BG II cotton hybrids: Aadhya, Akira, and US 7067. Disease severity was recorded weekly from the first appearance of symptoms through to the boll bursting and picking stage, using a 0 to 4 scale on twenty randomly tagged plants per plot.Concurrently, daily weather data—including maximum and minimum temperatures, morning and evening relative humidity, rainfall, number of rainy days, sunshine hours, wind speed, and evaporation—were recorded from the meteorological observatory. Correlation and multiple regression analyses were performed between percent disease index (PDI) and weather parameters using MS Excel.Results revealed that morning relative humidity and sunshine hours showed a significant positive correlation with PDI. In contrast, maximum and minimum temperatures, number of rainy days, and wind speed had significant negative correlations. Multiple regression analysis identified minimum temperature, evening relative humidity (RH II), and rainfall as common factors that significantly influenced the disease progress across all three cotton hybrids.
References
Anonymous. (2024). ICAR-AICRP (Cotton) Annual Report (2023–24). ICAR – All India Coordinated Research Project on Cotton, Nagpur.
Bhattiprolu, S.L. (2025). Effect of weather factors on the development of Corynespora leaf spot in cotton. Journal of Cotton Research and Development, 39(1): 47–51.
Bowen, K.L., Hagan, A.K., Jones, M.P.J., & Hagan, H.B. (2015). Relationship between target spot intensity and seed cotton yield. Phytopathology, 105(4).
Conner, K.N., Hagan, A.K., & Zhang, L. (2013). First report of Corynespora cassiicola incited target spot on cotton in Alabama. Plant Disease, 97(6): 837. https://doi.org/10.1094/PDIS-02-13-0133-PDN
Hagan, A.K., Bowen, K.L., Pegues, M., & Jones, J. (2015). Relationship between target spot intensity and seed cotton yield. Phytopathology, 105: 4.
Miller, M.E. (2018). Epidemics and yield loss due to Corynespora cassiicola on cotton. Plant Disease, 102: 2494–2499.
Mounika, P., Bhattiprolu, S.L., Ahammed, S.K., & Sreekanth, M. (2023). Influence of spacing on the progress of Corynespora leaf spot in cotton. Journal of Cotton Research and Development, 37(2): 227–232.
Roshan Baba Sk, Bhattiprolu, S.L., Prasanna Kumari, V., & Chiranjeevi, Ch. (2022a). Estimation of yield losses in cotton due to major fungal foliar diseases. Journal of Research ANGRAU, 50(3): 17–27.
Roshan Baba Sk, Bhattiprolu, S.L., Prasanna Kumari, V., & Chiranjeevi, Ch. (2022b). Progress of fungal foliar diseases in relation to weather parameters in cotton. Journal of Research ANGRAU, 50(4): 10–19.
Salunkhe, V.N., Gawande, S.P., Nagrale, D.T., Hiremani, N.S., Gokte-Narkhedkar, N., & Waghmare, V.N. (2019). First report of Corynespora cassiicola causing target leaf spot on cotton (Gossypium hirsutum) in South India. Plant Disease, 106(8): 2255.
Sharma, J. (2017). Epidemiology of target spot of cotton and tomato. M.Sc. Thesis (Unpublished), Auburn University.
Sheo Raj. (1988). Grading system for cotton diseases. Central Institute for Cotton Research, Nagpur. Technical Bulletin, pp. 1–7.
Siva Prasad, B.M.V., Bhattiprolu, S.L., Patibanda, A.K., Manoj Kumar, V., Jayalalitha, K., Prasanna Kumari, V., Divyamani, V., & Sai Ram Kumar, D.V. (2022). First report of Corynespora cassiicola causing target leaf spot on cotton in South India. Plant Disease, 106(8): 2255.
Wheeler, B.E.J. (1969). An Introduction to Plant Diseases. John Wiley and Sons, London. pp. 301
