Agronomically Enhanced Insect-Resistant Cottons
J.E. Jones, J.I. Dickson, J.B. Graves, A.M. Pavloff, B.R. Leonard, E. Burris, W.D. Caldwell, S. Micinski, and S.H. Moore
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ABSTRACT
Two elite frego bract cotton (Gossypium hirsutum L.) strains (La 850074-F and La 850075-F) were identified with resistance to the bollworm-tobacco budworm (BW-TBW) complex [Heliothis zea (Boddie) and H. virescens (F.)] equal to or better than La HG-660 and with yielding ability equal to 'Deltapine 41' (Dp 41) and IDES 1191 in the absence of BW-TBW damage. Three new frego bract strains (La 850082-FN, La 860280-F, La 860284-F) exhibited field resistance to BW-TBW higher than La HG660 with yields superior to this strain in the presence of BW-TBW and equal to it in the absence of BW-TBW damage. La 850082-FN is also nectariless; it gave exceptionally high yield stability across environments with little yield reductions in the presence of BW-TBW. These five strains have the frego bract trait, and thus, would be expected to be resistant to the boll weevil (Anthonomus grandis Boheman) as well. These agronomically enhanced, multiple insect-resistant cotton strains have the potential of reducing losses from insects, reducing production cost, reducing environmental contamination, and prolonging the effective life of pyrethroid insecticides.
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