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Geography has impact on grapevine moth's success in French vineyards
Date:1/8/2014

'Location, location, location' is an adage also true for the European grapevine moth, it seems. Research led by Fanny Vogelweith of the Universit de Bourgogne and INRA Bordeaux-Aquitaine in France has shown that these pests are better adapted and more successful in certain French wine-growing regions than in others, because of the variety of grape on which they occur and the abundance of their natural enemies around them. The findings were published in Springer's journal Naturwissenschaften The Science of Nature.

The European grapevine moth (Lobesia botrana) is a major grape pest in Europe because of its wide geographical distribution. The damage caused when its larvae feed on grape berries makes infection by pathogenic fungi, including the grey and black mold, easier. This leads to losses suffered by farmers.

To further understand the moth, Vogelweith's team assessed how the immune variation of its wild populations is influenced by its host plants and natural enemies. This is an important factor, as the maintenance of the immune system is generally a costly affair for most organisms and can inhibit growth and spread.

The research team therefore collected and measured larvae from up to five grape varieties from vineyards in six French viticulture regions, namely Alsace, Aquitaine, Bourgogne, Champagne-Ardenne, Rhne-Alpes, and Provence-Alpes-Cte d'Azur. Parasites found on these larvae were also collected and analyzed.

The researchers found a marked geographical variation in the immune defense and the level of parasitism among natural populations of the grapevine moth. The more parasites found in a vineyard, the higher the investment in immune defense rather than body growth. This suggests that immune defense is metabolically expensive.

Larvae sampled in the southern area from the Chardonnay, Pinot Gris, and Pinot Noir varieties tended to have a greater number of immune-related hemocyte cells and a hig
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Contact: Joan Robinson
joan.robinson@springer.com
49-622-148-78130
Springer
Source:Eurekalert

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