Influence of Weather Parameters (Epidemiology) on Powdery Mildew Disease Development caused by Leveillula taurica

Author: Vineeth M., M.D. Thabrez, Aaqib Ayub, Laxman Navi and Manoj M.

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Abstract

Chilli (Capsicum annum L.) is a well known commercial crop in the centre of the world. It is an important spice in developed and developing nations because of its pungency and taste it makes even in household. The current research was conducted at College of Agriculture, Shivamogga, during Rabi 2020-2021 to create a prediction model for chilli powdery mildew disease on susceptible cultivar Byadagi Kaddi with suggested package of practises except for powdery mildew disease management. Prediction of powdery mildew was made one week well in advance. The simple regression equation for 2020-21 was ŷ = 8.32 + 0.95x with R = 0.95741 and R2 = 0.9166. However, it is important to note that the disease was influenced by various weather factors. The studies on effect of weather factors on development of disease revealed that, 5th standard week was highly favourable for initiation and further development of disease and the biggest challenge is to predict the favourable weather conditions and time of appearance of disease and this was employed successfully here.

Keywords

Powdery mildew, Leveillula taurica, Area under disease progress curve

Conclusion

Prediction of powdery mildew was made one week well in advance. The simple regression equation for 2020-21 was ŷ = 8.32 + 0.95x with R = 0.95741 and R2 = 0.9166. However, it is important to note that the disease was influenced by various weather factors. The studies on effect of weather factors on development of disease revealed that, 5th standard week was highly favourable for initiation and further development of disease. There was a positive correlation between the disease incidence and all weather parameters except for minimum relative humidity. The multiple linear regression equation was fitted to the data and the equation arrived for all the weather parameters is Y = -96.73 + 1.38X1 + 5.71X2 + 0.19X3 -1.05X4 + 0.35X5 -0.08X6. The apparent rate of infection (r) and Area Under Disease Progress Curve (AUDPC) values were important criteria of epidemics. During 2020-21, highest rate of infection (0.154) was observed between 7th meteorological week. Lowest AUDPC value (10.01) was obtained in the 5th MSW. During crop growth period, AUDPC values increased gradually and reached maximum (400.54) on 11th MSW of 2021 and further, gradually reduced and reached (262.265) on 16th MSW of 2021.

References

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How to cite this article

Vineeth M., M.D. Thabrez, Aaqib Ayub, Laxman Navi and Manoj M. (2023). Influence of Weather Parameters (Epidemiology) on Powdery Mildew Disease Development caused by Leveillula taurica. Biological Forum – An International Journal, 15(10): 1547-1553.