Wolbachia in European Populations of the Invasive Pest Drosophila suzukii: Regional Variation in Infection Frequencies.

In two European localities, Mougins (in France) and San Michele (in Italy), we sampled for two consecutive years at the same period (October, 2012–13 and September, 2013–14 respectively) and found an increasing trend of the Wolbachia prevalence over time for both localities (Mougins: from 0.46 to 0.57; San Michele: from 0.22 to 0.65; Table 1 ) though the trend was not significant (Fisher’s exact test, P = 0.74 and P = 0.05 respectively).

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