Assessing Cotton Genotypes for Resistance to <i>Aphis gossypii</i> (Hemiptera: Aphididae)

Abstract Aphis gossypii Glover (Hemiptera: Aphididae) is a polyphagous species frequently associated with the presence of sooty mold and viruses lethal to plants. The purpose this work was characterize possible resistance categories cotton genotypes against A. gossypii. Initially, preliminary test carried out 78 genotypes, 15 which were selected for infestation ability assays determination cumulative aphid-day rates. Posteriorly, these also evaluated through antixenosis antibiosis assays. FM 910, 966 LL, Mocó, Gossypium hirsutum var. punctatum L. (Malvaceae), Variedade Reba = BTK-12, Deltapine, Hi-Bred, Acala 4–42, IAC PV010-1664, 21, B-50 PR FMT 709 inhibited aphid colonization. In assay, G. punctatum, PV010-1664 4–42 least infested. multiple-choice Deltapine Smooth Leaf BTK-12 significantly less infested, suggesting antixenosis. arboreum (Malvaceae) 1 showed lowest number nymphs, nymphs per adult day and, at 10 d after birth first nymph in addition reducing reproductive period, nymphal survival, longevity developmental time. produced decreased, indicated resistance. results obtained here are unprecedented can be explored breeding programs develop insect-resistant cultivars.