SURVEY AND FIELD SCREENING OF APHIDS AFFECTING BARLEY

Document Type : Original Article

Authors

1 Field Crops Research Institute, Agricultural Research Centre, Giza, Egypt

2 Plant 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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