FIELD AND LABORATORY SCREENING OF BARLEY GENOTYPES FOR APHID RESISTANCE IN EGYPT

Document Type : Original Article

Authors

1 Plant Protection Research Institute, Agricultural Research Centre, Giza, Egypt

2 Barley Breeding Department, Field Crops Research Institute, Agricultural Research Centre, Giza, Egypt

Abstract

Barley breeding lines and cultivars have been evaluated for their levels of sensitivity to aphid infestation under laboratory and natural in­festation conditions in the field. In 1992/93 barley season, laboratory screening of 80 barley genotypes revealed 9 resistant and 8 moderately resistant entries to the corn leaf aphid Rhopalosiphum maidis. The criter­ion for resistance was based on the average daily reproduction rate of the female aphids_ Field screening of 80 genotypes in two localities re­vealed the existence of 5 entries in Mallawi and 15 in Giza that har­boured the lowest aphid population (0-25 aphids per plant) on the least percentage of infested plants per plot. In 1993/94 growing season, la­boratory screening revealed 2 resistant and four moderately resistant genotypes to R. Maidis out of 60 entries. Field screening of the same 60 genotypes grown at Giza Resea­rch Station revealed 4 entries that were resistant to aphid build-up. Field screening of 80 barley genotypes (92/93 group) grown at Mallawi Re­search Station for the second season revealed 8 resistant entries. Five of these were found resistant in the previous season either at Giza or at Mallawi.

Keywords

Files

Share

How to cite

Statistics