RELATIVE SUSCEPTIBILITY OF SIX MAIZE CULTIVARS TO INFESTATION WITH CERTAIN APHID SPECIES AT GIZA AND QUALUBIA GOVERNORATES, EGYPT

Document Type : Original Article

Authors

1 Department of Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University, Giza, Egypt

2 Plant Protection Research institute, Agricultural Research Centre, Dokki, Giza, Egypt

Abstract

Six maize cultivars commonly grown in Egypt were evaluated to infestation with three aphid species attacking maize plants at Giza and Qualubia regions. The maize cultivars were a Single Cross 10, two Dou­ble Crosses: D.C. 204 and D.C. 215, triple cross 310, Comp. 45 and the open pollinated variety Giza 2. Cultivars were planted at Giza region on two sowing dates, June 1 and 16, 1990 and at Qualubia region on three sowing dates; May 15, June 15 and July 15, 1991. Only Rhopalosiphum maidis Fitch infested maize cultivars in Giza region, while in Qualubia re­gion, cultivars were infested with three species; Rh.maidis, Rh.Padi L., and Aphis gossypfi Glover. The cultivars Comp. 45 and Single Cross 10 received the least rate of infestation with the three aphid species. The Triple Cross 310 was susceptible to Rh.maidis and A.gossypii but it showed moderate infestation with Rh_padi. Giza 2 variety showed moder­ate infestation with all species. The Double Crosses 204 and 215 were highly susceptible to all species in all sowing dates at the two regions.`

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