Pheromone antagonism in lepidopteran maize pests
2011
Ardanuy, Agnès | Albajes, Ramon | Eizaguirre, Matilde | Lopez, Carmen | Universitat de Lleida
Coinciding with the deployment of Bt maize in the study area, but not necessarily due to it, populations of corn borers have decreased in the last few years, while the incidence of other aerial Lepidoptera, such as Mythimna unipuncta and Helicoverpa armigera, seems to have increased. In previous papers we showed that Z11-16 Ald, a Sesamia nonagrioides component, inhibits pheromone perception by Ostrinia nubilalis males, whereas the two components of O. nubilalis pheromone inhibit perception by S. nonagrioides males in EAG, wind tunnel and field trials. We have also recorded the inhibitory effect of the aldehyde on M. unipuncta pheromone perception in wind tunnel and field trap trials. In the current paper we present the study on how H. armigera respond to this inhibitory system. Effects of different pheromone components of S. nonagrioides, M. unipuncta and O. nubilalis on the behaviour of H. armigera males in the wind tunnel are reported. Maximum response in upwind flight and source contact was recorded with the mixture of the H. armigera major (also present in S. nonagrioides pheromone) and minor components [Z11-16:Ald and Z9-16:Ald respectively], whereas no response to the O. nubilalis pheromone components was observed. Addition of Z11-16:OH (for some authors a component of H. armigera pheromone) significantly reduced response in this species, so it is thought that additional doses should be tested.
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