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Influence of Weather Parameters on Occurrence of Alternaria Leaf Spot of Cotton under High Density and Normal Planting Systems

Author: Ch. Yamuna*, S.L. Bhattiprolu, V. Prasanna Kumari and Ch. Chiranjeevi

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Abstract

The effect of weather factors on the development of Alternaria leaf spot in LHDP-1 variety was investigated during kharif 2018-2019 at Regional Agricultural Research Station, Lam farm, Guntur. The data on per cent disease index (PDI) of Alternaria leaf spot was recorded at three days interval under high density planting system (HDPS) and normal planting system (NPS) along with weather parameters. The disease appeared in the second week of Augustand reached peak of 29.71 PDI under HDPS as against 27.81 PDI under NPS during boll maturity stage. Significant positive correlation was observed with maximum temperature, sunshine hours and evaporation whereas evening relative humidity and rainfall showed significant negative correlation under HDPS. Under NPS maximum temperature, morning relative humidity, sunshine hours and evaporation showed significant positive correlation; evening relative humidity and rainfall showed significant negative correlation. From the full model regressio

Keywords

Alternaria leaf spot, cotton, high density planting system, weather parameters.

Conclusion

Based on the present investigation to understand the influence of weather under HDPS it can be concluded that the development of Alternaria leaf spot had a positive correlation with maximum temperature, sunshine hours and evaporation; negative correlation with evening relative humidity. Relative humidity coupled with evaporation was critical for the progress of the disease under HDPS whereas number of rainy days, sun shine hours and wind speed also contributed for diseases development under NPS. This clearly indicates the role of spacing in disease dynamics.

References

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How to cite this article

Ch. Yamuna, Bhattiprolu, S.L., Kumari, V.P. and Ch. Chiranjeevi (2021). Influence of Weather Parameters on Occurrence of Alternaria Leaf Spot of Cotton under High Density and Normal Planting Systems. Biological Forum – An International Journal, 13(3a):