Key words: Aphis craccivora, Crop Pest, Entomopathogenic Fungi, median lethal concentration INTRODUCTION Cowpea aphid, Aphis craccivora (Koch) is a threat to cowpea growers in all over the country. Key words: Vigna unguiculata, Aphis craccivora, SSR marker, RAPD, Marker-assisted selection, Anti-xenosis Introduction Yardlong bean and cowpea belong to Vigna unguiculata (L.) Walp, they are most widely used le-gume in the tropics. Host plants: Polyphagous, with a preference for legumes.. Economic importance: The feeding of this aphid on clover and alfalfa causes plant wilting as well as … Reference citations: Alimdzhanov R.A., Zhuravleva I.A. Siphunculus. Due to heavy 1996,Obopile&Ositile2010). The use of resistant cultivars is among the best management option for this pest, but the success of this strategy is influenced by the stability of the resistant genotype to the cowpea aphid biotypes present in the major cowpea growing areas in a country. Whiteflies damage cole crops by sucking enormous quantities of sap and covering plants with sticky honeydew. serious damage and impact yield negatively (Fatokun, 2002).The cowpea aphid, Aphis craccivora , is a major pest of cowpea in Africa (Singh and Jackai, 1985). Aphis craccivora Koch (Homoptera: Aphididae), is one of the most widespread and destructive insect pests of cowpea and host-plant resistance is an effective approach to minimize the pest damage at seedling stage. and causes tissue death, decay of the buttons and base of the stem, and stains in the flowers. Aphis craccivora is one of the most common aphids in the tropics. Some clones of Aphis craccivora are sufficiently toxic to the invasive and dominant predatory ladybird Harmonia axyridis to suppress it locally, ... Plants exhibiting aphid damage can have a variety of symptoms, such as decreased growth rates, mottled leaves, yellowing, stunted growth, curled leaves, browning, wilting, low yields and death. In this report, we examine how the aphid Aphis craccivora Koch infests Catasetum sp. 2.8 Damages and losses caused by cowpea aphids (Aphis craccivora) 7 2.9 Aphid borne mosaic virus 8 2.10 Resistance of cowpea lines against cowpea aphids 8 2.11 Cowpea beetle ... 2.17 Damage and losses caused by bruchids 12 2.18 Host-plant resistance to insect pests of cowpea 12 Aphis craccivora. It is large, light green, and found on almost all legumes. and causes tissue death, decay of the buttons and base of the stem, and stains in the flowers. It is by Brendan Wray. aphid, Aphis craccivora Koch, is one of the most serious pests of legumes, such as faba bean, cowpea and pea [3]. It causes direct damage by feeding, which may induce plant deformation and indirect damage caused either by honeydew or by transmission of viruses[4]. However, financial losses are not well recorded for any crop. Although several aphid species may infest faba beans Aphis. Aphis craccivora causes direct damage to plants by stunting and distorting growth. On an average, 20 nymphs per m row reduced the yield to the extent of 49 kg/ha and 79 kg/ha in 20102011 and 2011cropping season, respectively. They primarily cause damage either by direct feeding or by the transmission of plant viruses (Pickett et al., 1992). from damage score indicated that a single dominant gene controlling cowpea resistance in IT82E-16. As part of an extensive and systematic programme to find genetic sources of resistance to Aphis craccivora, a major pest of cowpea, Vigna unguiculata, a total of 181 accessions from the germpiasm collection at the International Institute of Tropical Agriculture were screened in glasshouse tests using a simple visual damage scale.Twenty-four accessions showed considerably reduced damage. EILs for - -2012 . No specific permit was required for the described collection. damage by various insect pests in the field (Benchasri and Bairaman, 2010). 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