Evaluation of the Resistance of Different Barley Accessions to the Russian Wheat Aphid Diuraphis noxia

Abstract

This study aimed to assess the natural resistance of 72 barley accessions to the Russian wheat aphid Diuraphis noxia. Three parameters were used to evaluate the response of barley accessions (chlorosis, yield and morphological characteristics). A limited chlorosis rate was recorded for the accession 23 (11 to 20% which was associated with important spike weight (3.02 g) and 1000-grain weights (53.84 g)). In spite of its chlorosis rate situated between 31 and 50%, the accession 68 presented a dry weight (6.49 g) and a number of tillers (3) the most important compared to the rest of accessions. In resistant accessions, the high number of hairs on their leaves has probably limited the action of this aphid on yield, especially the weights of the ears and the 1000 grains. The local accession Saida was the most susceptible to the Russian wheat aphid.

Keywords

• Aphid
• barley
• Diuraphis noxia
• resistance