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Sudan Journal of Agricultural Research

Prevalence and forecast of the date moth, Ephestia calidella (Guen.) (Lepidoptera: Pyralidae) and the saw-toothed grain beetle, Oryzaephilus surinamensis (L.) (Coleoptera: Silvanidae) on stored dates

Susan M. A. El-Nazir , E. El-Khdir and M. E. Shazali
 
Abstract

The succession and population increase of the stored date insects was investigated in a warehouse studies from November, 2001 to December, 2002. The date moth, Ephestia calidella was prevailing during the cool drier and the saw-toothed grain beetle, Oryzaephilus surinamensis was during the warm humid months of the year. The number of E. calidella larvae was observed to decrease as the numbers of O. surinamensis increased. The percentage of dates infested by E. calidella and O. surinamensis during the 14 months of storage was 55.0, 39.0, 27.3, 12.5 and 2.0% for E. calidella and 90.2, 82.0, 97.5, 92.5 and 25% for O. surinamensis on Gondaila, Bit-Tamoda, Mishrig Wad Khateeb, Mishrig Wad Laggai and Barakawi, respectively. The percentage of weight loss was 20.4, 19.6, 18.4, 10.5, and 7.3 % for the five mentioned cultivars, respectively.

Sudan Journal of Agricultural Research Vol. 9 (2007) PP. 115-120