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- Title
Bemisia tabaci females from the Mediterranean (Q) species detect and avoid laying eggs in the presence of pyriproxyfen, a juvenile hormone analogue.
- Authors
Moshitzky, Pnina; Morin, Shai
- Abstract
BACKGROUND: Pyriproxyfen, a juvenile hormone analogue, disrupts embryogenesis, metamorphosis and adult formation in Bemisia tabaci, but does not directly affect adult females. The effect of pyriproxyfen on egg-laying preference and performance of B. tabaci females and the influence of resistance to pyriproxyfen on these reproductive behaviours were studied. RESULTS: Choice experiments utilising cottonplants treated and not treated with pyriproxyfen revealed a significant preference for egg laying on non-treated plants both by resistant and susceptible females. No-choice assays indicated a reduction of ∼60% in the number of eggs laid on pyriproxyfen-treated plants by both resistant and susceptible females. The reduction in oviposition on treated plants was not accompanied with reduced expression of the vitellogenin gene or a delay in oocyte maturation, but significant accumulation ofmature oocytes in the ovaries was observed, and could be reversed by transferring the females to non-treated plants. CONCLUSION: Pyriproxyfen caused reduced oviposition and enhanced mature oocyte accumulation in pyriproxyfen-resistant and pyriproxyfen-susceptible females. These findings can be explained by two alternative mechanisms: pyriproxyfen-regulated physiological arrest of oviposition, involving hormonal regulation of myotrophic factors,or the hierarchy-thre shold behavioural theory of host choice, in which pyriproxyfen-treated plants are definedas low-qualityhosts.Aspects of applicationare discussed.
- Subjects
BEMISIA; BIOLOGICAL control of cotton diseases &; pests; BEMISIA argentifolii; SWEETPOTATO whitefly; PYRIPROXYFEN
- Publication
Pest Management Science, 2014, Vol 70, Issue 10, p1468
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.3698