Impact analysis of weather factors in relation to early shoot borer (Chilo infuscatellus Snellen) incidence in summer planted sugarcane after wheat harvest in subtropics

The highest incidence of C. infuscatellus was recorded during 21^st standard week (8.8 per cent) at 43.1°C maximum temperature, 28.4°C minimum temperature, 57.0 per cent maximum relative humidity, 21.0 per cent minimum relative humidity and 9.1 sun shine hours. Sugarcane variety CoS 8436 planted after wheat harvest significant positive correlated with minimum temperature and highly significant with minimum relative humidity in all the varieties. The correlation coefficient showed significant and positive correlation with minimum temperature while it was highly significant and negatively correlated with minimum relative humidity with shoot infestation. The effect of maximum temperature with shoot infestation showed a negative correlation. The maximum relative humidity showed non significant positive correlation where as it was positively correlated with minimum relative humidity and sun shine hours.