SURVEY AND FIELD SCREENING OF APHIDS AFFECTING BARLEY | ||
Egyptian Journal of Agricultural Research | ||
Article 30, Volume 73, Issue 4, December 1995, Pages 943-954 PDF (3.89 M) | ||
Document Type: Original Article | ||
DOI: 10.21608/ejar.1995.442876 | ||
Authors | ||
ABDEL-FATAH A. EL-SAYED1; SADEK I. BISHARA2; MAHER M. NOAMAN1; GODA M. EL-DEFRAWI2 | ||
1Field Crops Research Institute, Agricultural Research Centre, Giza, Egypt | ||
2Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt | ||
Abstract | ||
Survey of aphids infesting barley grown in nothwestern coastal region of Egyp, carried-out in March 1989 revealed the existence of the corn leaf aphid Rhopalosiphum maidis (Fitch) as the dominant cereal aphid. Three areas were surveyed being Nubaria, Borg El-Arab, and Marsa Matrouh. The highest aphid population existed in El-Kasr locality west of Marsa Matrouh. Field screening of 158 barley genotypes for aphid resistance was carried out in three localities being Nubaria, El-Kasr (northwestern coast), and Mallawi (Middle Egypt). Levels of aphid infestion and damage rate were evaluated according to 5-category scale. In Nubaria, aphid infestation was very low; only 45 entries out of 158 that harboured 1-3 aphid colonies per row. In EI-Kasr locality, most genotypes were infested with aphids but 10 entries were aphid-free and can be considered as sources of resis-tance. In Mallawi, barley was exposed to high infestation with four spe-cies of aphids namely Rhopalosiphum padi, R, maidis, Schizaphis grami-num, and Sitobion avenae. Ten entries were however, fairly resistant/ tolerant, exhibiting the lowest rate of infestation. | ||
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