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Assessment of environmental variables conducive for epidemiology of rice-blast pathosystem

Syed Atif Hasan Naqvi, Rashida Perveen

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Int. J. Biosci.7(2), 199-206, August 2015

DOI: http://dx.doi.org/10.12692/ijb/7.2.199-206

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Abstract

Rice blast-pathosystem is one of most serious disease of rice caused by Pyricularia oryzae. Environmental factors play an important role in sudden outbreaks of rice blast in all rice growing regions of the world. In the current study different environmental factors were explored by correlation and regression analysis to find out their contribution to facilitate the rice blast disease. Maximum disease severity 62.32% and AUDPC (635.35) was calculated on Basmati-2000 while minimum (432.85) was recorded on Basmati-Pak. Environemntal factors viz., Rainfall and relative humidity showed a positive correlation whereas temperature maximum depicted a negative correlation and remained irresponsive in disease development. All of the regression model parameters were significant at P ≤ 0.05 and Rain fall, relative humidity of morning and evening and wind speed significantly contributed to the development of rice blasting pathosystem except sun shine hours and temperature factor. The coefficient of determination (r2) of 0.93 proved the significance of overall regression model accuracy. The model developed as full showed 96% variability towards the advancement of the disease.

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