Relative performance of European grapevine moth (<Emphasis Type="Italic">Lobesia botrana</Emphasis>) on grapes and other hosts |
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Authors: | Email author" target="_blank">Denis?ThiéryEmail author Jér?me?Moreau |
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Institution: | (1) UMR 1065 INRA-ENITAB Santé végétale, INRA Institut Supérieur de la Vigne et du Vin, B.P.81, 33883 Villenave d’Ornon Cedex, France;(2) Institut de Zoologie, Université de Neuchatel, 2007 Neuchatel, Switzerland;(3) Present address: Equipe Ecologie-Evolution, UMR 5561Biogéosciences, Université de Bourgogne, 6 Bd Gabriel, 21000 Dijon, France |
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Abstract: | The European grapevine moth, Lobesia botrana is a major grapevine pest, but despite the abundance of vineyards it is a generalist and uses either grapes or alternative
species. Given the abundance and predictability of grape, L. botrana could be expected to have evolved towards monophagy. In order to understand why this species remains polyphagous, we hypothesized
that larvae reared on rare wild host plants should have higher fitness than those reared on the more abundant grape host.
For this, we compared larval performance and several life history traits on three alternative host plants (Daphne gnidium, Olea
europaea, Tanacetum vulgare) and three Vitaceae (Vitis vinifera), two cultivars and one wild species (Ampelopsis brevipedunculata), and two control groups raised on either a low or a high nutritive value medium. Alternative hosts are more suitable than
Vitaceae for the reproductive performance of L. botrana: larval mortality and development time was reduced, while pupal weight, growth rate, female longevity, female fecundity,
duration of laying and mating success were increased. High quality food ingested by larvae promotes higher adult body weight
and enhances female reproductive output. This suggests that alternative hosts provide greater nutritional value for L. botrana than Vitaceae. The use of alternative host plants could thus be maintained in the host range because they offer L. botrana a better fitness than on the Vitaceae. This could typically represent an advantage for moths behaving in plant diversity
grape landscapes. |
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Keywords: | Lobesia botrana Polyphagy Insect plant relationships Life history traits |
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