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Sudan Journal of Agricultural Research

The intrinsic rate of natural increase of the date moth, Ephestia calidella (Guen.) (Lepidoptera: Pyralidae), a pest of stored dates in Sudan

Susan M. A. El-Nazir, E. El-Khidir and M. E. Shazali

Abstract

The intrinsic rate of natural increase was calculated for the date moth, Ephestia calidella on two date cultivars. The highest value was 0.87 at a mean temperature and relative humidity of 29.2°C and 39.8% (October-November) on Gondaila. However, on Barakawi the highest value was 0.57 at 33.1°C and 45.3% R.H. (October-January). Individuals of the observation period (May-November) studied at a mean temperature and relative humidity of 34.9 C and 39.2% showed the lowest potential growth rate on both cultivars (0.27 on Gondaila and 0.15 on Barakawi).
 

Sudan Journal of Agricultural Research Vol. 9 (2007) PP. 109-114