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Antixenosis and larval and adult dispersal in the M editerranean corn borer, S esamia nonagrioides , in relation to B t maize
Author(s) -
López Carmen,
HernándezEscareño Gerardo,
Eizaguirre Matilde,
Albajes Ramon
Publication year - 2013
Publication title -
entomologia experimentalis et applicata
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.765
H-Index - 83
eISSN - 1570-7458
pISSN - 0013-8703
DOI - 10.1111/eea.12131
Subject(s) - biology , biological dispersal , pest analysis , larva , integrated pest management , botany , ecology , population , demography , sociology
S esamia nonagrioides L efèbvre ( L epidoptera: N octuidae) is a key pest of maize [ Z ea mays L . ( P oaceae)] and a main target of B t maize in the Mediterranean area. To choose the most suitable non‐ B t refuge strategy for preventing or delaying resistance development in this maize borer, we examined its biology and behaviour. No antixenotic effects were found on numbers of eggs and egg batches per plant in choice ( B t vs. non‐ B t plants) and no‐choice assays. However, a greater ratio of young larvae dispersed from B t than from non‐ B t plants. In addition, larvae that hatched on B t plants tended to disperse more than those that hatched on non‐ B t plants, particularly during young growth stages. Many adults, especially females, could fly at least up to 400 m, as was found in a dispersal study with rubidium‐marked adults. The stimulation of larval dispersal by the B t trait and the dispersal capacity of adults might compromise the efficacy of seed mixtures as an insecticide resistance management strategy.