Abstract
Field studies were conducted to determine the environmental factors associated with infection of field and protected plants. The overall mean disease incidence and intensity was 84.8% in protected environment and 82.2% in field condition during last week of October in 2014 and 2015, respectively. Results revealed that correlation coefficient (r) showed strong positive correlation (r = +841) with minimum temperature ranged (24.8–23.8°C) with maximum relative humidly (r = +0.792) ranged (91.1–84%) and negatively correlated with maximum temperature and minimum relative humidity (r =-0.170 &-0.826), (30.3–33.9°C) and (70.7–47.1%), respectively. In the case of field condition, r was (−0.37) with maximum (+0.94) minimum temperature, (+0.92 &-0.92) with maximum and minimum relative humidity and-0.62 rainfall, respectively. Disease severity was found comparatively higher in the temperature range from (24.8–35.4°C) and (20.0–33.9°C) coupled with relative humidity (66.5–91.1%) and (38.4–84.1%), respectively in polyhouse (protected) and field conditions.
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