Effect of weather parameters on blue pine (Pinus wallichi ana J.) needle blight and ascospore release of Lophodermium pinastri in India
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Abstract
During the study period maximum logrithemic infection rate of 0.0618 and 0.0285 unit/day was recorded during the first fortnight of April in 2008 and 2009, respectively. Weather factors viz. temperature and relative humidity were positively correlated with disease intensity (62.1 per cent contribution). However, except temperature all other weather factors were positively correlated with the disease development in terms of infection rate (units/day) (25.7 per cent contribution).The correlation studies of various meteorological factors with disease development revealed significant positive correlation of disease intensity with mean temperature, wind speed and relative humidity. The correlation of disease intensity with rainfall and wind speed was negative. The apparent infection rate was negatively correlated with temperature, but positively correlated with relative humidity, rainfall and wind speed. The multiple linear regression fitted to data revealed that weather factors influenced the disease intensity to the extent of 62.1 per cent in 2008-2009 and for infection rate to the extent of 25.7 per cent. Correlation of various meteorological factors with spore release revealed that spore release and temperature were negatively correlated during whole season (2009) but positively correlated for August-September period. The correlation of spore release with relative humidity, rainfall and wind speed was significantly positive during whole season. The disease incidence depicted negative correlation with temperature, rainfall and wind speed but was positively correlated with RH. Multiple regression analysis of spores released per cm2 and disease incidence with weather parameters revealed the coefficient of determination (R2) of 43.9, 72.6 and 21.0 per cent for the spores released was during June-July, August-September periods and in whole season, respectively. However, it was 35.0, 90.9 and 90.3 per cent for disease incidence during June-July, August-September and in whole season on Blue pine plantations.
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