Abstract: In the experiment conducted at University of Arid Agriculture Rawalpindi during 2002, it was concluded that there was great difference in mean infestation of Odontotermes obesus during 2nd and 9th week of the year 2002.Mean infestation percentage was maximum(7.89%) during 2nd week of the year 2002.The infestation rate then declined somewhat and remained between 5.90%- 3.10% during next five weeks. Infestation trend during 9th week declined uncertainly. Then mean infestation decreased to minimum level(I.58%) during 9th week. The reason of this great difference might be that as the crop grew to maturity, it became more vigorous and became resistant to termite attack. During the observation of the environmental factors, it was seen that rainfall and temperature were negatively correlated with mean infestation indicating inverse relationship. Humidity was positively correlated with mean infestation of Odontotermes obesus indicating direct relationship.