Behaviour of coffee white stem borer beetle in the field.
Information on the behaviour of the coffee white stem borer (Xylotrechus quadripes) adult in the field is scanty. Hence, the present investigations were undertaken to study in detail the flying, mating and oviposition behaviour of the beetle in the field (Karnataka, India) by erecting a field cage to confine the beetles and observe their activity continuously during both the summer and winter flight periods. The observations indicated that maximum mating occurred from 10.00 to 16.00 h during the summer period and from 12.00 to 16.00 h during the winter season. These results correlated with flight activity, such that the maximum flight activity of the beetles took place from 10.00 to 15.00 h during summer and from 11.00 to 16.00 h during winter. Under optimum temperature and sunshine, the mating duration was found to be 9.79±1.28 seconds in winter and 7.97±0.78 seconds in summer. The borers required bright weather rather than cloudy conditions for egg-laying which was more between 12.00 to 16.00 h. More egg-laying was observed on the main stem rather than on other sites.