Daphne gnidium, a possible native host plant of the European grapevine moth Lobesia botrana, stimulates its oviposition. Is a host shift relevant? |
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Authors: | Nevile Maher Denis Thiéry |
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Institution: | (1) Unité Mixte de Recherches en Santé Végétale 1065, INRA-ENITAB, BP 81, 33883 Villenave d’Ornon Cedex, France |
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Abstract: | Summary. We tested the hypothesis that Daphne gnidium is an ancestral host plant of Lobesia botrana. To this end, we studied the oviposition response of this moth to various aerial organs of this plant. Our results show that
females prefer to lay eggs on daphne berries rather than on grapes (cv. chasselas) and that polar surface extracts of daphne
berries and leaves strongly stimulate oviposition in a dosedependant way, whereas flower extracts are weakly stimulant and
branch extracts are inactive or deterrent for oviposition. Furthermore, a total extract of daphne berries stimulates oviposition
in semi-natural conditions when applied onto fresh grapes. Oviposition stimulants from berries were isolated by HPLC coupled
with a dual-choice oviposition bioassay. The ecological value of D. gnidium for L. botrana is discussed and the possible use of oviposition stimulants from daphne, contrasting with the oviposition signal of the cultivated
host plant, is proposed in the perspective of developing behavioural manipulation methods such as stimulo-deterrent diversionary
strategies compatible with IPM programs. |
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Keywords: | Oviposition site selection Lobesia botrana host plant Daphne gnidium oviposition stimulants and deterrents Vitis vinifera choice assays HPLC |
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