Evaluation of resistance of some barley varieties to wheat stem sawfly (Hymenoptera: Cephidae) in Hama Governorate
Wheat stem sawfly (Hymenoptera: Cephidae) is a significant pest on wheat and barley in Syria, and host plant resistance is one of the most effective mitigation of wasps damage. The preference for laying eggs among females of wheat stem sawfly (WSS) was studied in some cultivation barley varieties in Syria, and the reasons for this preference, by comparing the characteristics of plant height in the stages of early wasp propagation, phenological development stages synchronized with late propagation wasps stages that are known having attraction influence for female wasps to put eggs, within the natural conditions at the place of experimenting in Soran region, northern of Hama, about 20 km. The results showed a great variation in the infection rates between the tested barley cultivar varieties. Female of wheat stem sawfly (WSS) preferred to lay eggs in the barley cultivar (Arabi Aswad) (Aswad means black), which was a sensitive variety for infection althoughit is not being the highest height plant in the early stages or the less developed in the late stages of wheat stem sawfly spread, whereas the rest of the tested varieties distinguished (Furat 1, Furat 3, Furat 4, Furat 5, Furat 6, Furat 9, Arabi Abiad, and Arabi Abiad Mohsan) (Abiad means white, Mohsan means improved) by its relative resistance to the injury. Our results suggest conducting other studies to reach the reasons forpredilection preference or lack of preference and benefit from them later for reducing losses resulting from this injury.