Meteorological variables in relation to an epiphytotic of powdery mildew disease of Mustard
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Keywords:
Meteorological variables, Indian mustard, powdery mildewAbstract
Development and progress of powdery mildew (Erysiphe cruciferarum) disease on Indian mustard was studied in relation to meteorological factors in 3 consecutive rabi seasons in 1992/93-1994/95. Studies were carried out in Anand, Gujarat, India. For the initiation of development of powdery mildew, mean temperature, number of trapped conidia and crop age showed a significantly positive correlation. Regression analysis of these factors accounted for 75% per cent of the variation. Excluding the averagenumber of trapped conidia accounted for 69% of the variation (R=0.69). A significantly positive correlation of accumulated growing degree days (GDD) and cumulative number of trapped conidia (from flowering to harvesting stage) was observed with area under disease progress curve. These elements were the most effective determinants in predicting the area under disease progress curve, which explained 78% of the variation (R=0.78).
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