حصر لأهم الآفات الحشرية التي تصيب محصولي القمح و الشعير في ليبيا

Abstract EN

Wheat and barley are important crops in Libya.

Insect pests are among the main stresses keeping the productivity of these crops low.

The objective of this study was to identify the major insect pests in wheat and barley fields and to determine their levels of infestation in a survey conducted during 1995/ 1996, 1997/ 1998 and 1999/2000 seasons.

The distribution of the insects and their level of infestation varied according to field’s location (regions) and year.

The barley stem gall midge, Mayetiola hordei Kieffer, was found in the west coast, central and eastern regions, with infestation level varying between 20-100%.

The barley shoot fly, Delia spp., was also found in these regions; infested plants varied between 10-75%.

In the eastern region, the major insect pests were Pachytychius hordei Brulle and Oria musculosa Hub.; their infestation level varied between 20-90% and 20-70%, respectively.

Insect pests found in the southern region were O.

musculosa, Schizaphis graminium Rond.

and Ropalosiphum maidis Fitch., with infestation levels of 70, 50 and 20%, respectively.