FIELD AND LABORATORY SCREENING OF BARLEY GENOTYPES FOR APHID RESISTANCE IN EGYPT | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 10, Volume 75, Issue 3, September 1997, Page 623-634 PDF (2.66 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.1997.410316 | ||||
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| Authors | ||||
| SADEK I. BISHARA1; ABDEL-FATAH A. EL-SAYED2; MAGDY A. EL-HARIRY1; IBRAHIM A. MARZOUK1; MOHAMED ABDEL-HAMID2 | ||||
| 1Plant Protection Research Institute, Agricultural Research Centre, Giza, Egypt | ||||
| 2Barley 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 | ||||
| Barley; Resistance to aphids; Rhopalosiphum maidis; Egypt | ||||
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