Can exotic drosophilids share the same niche of the invasive Drosophila suzukii?

The presence of the four exotic drosophilids Chymomyza amoena (Loew),Drosophila suzukii (Matsumura), Zaprionus indianus (Gupta) and Zaprionus tuberculatus Mallochhas been investigated in different orchardsin Northern Italy for two consecutive years. The presence and the abundance of the population of the drosophilid flies were surveyed with apple cider vinegar traps, fruit baited traps, and fruit collection. Chymomyzaamoena, Z. tuberculatusand D. suzukiihave been identified in the ACV traps in both years. Only D. suzukiiand Z. tuberculatusemergedfrom fruit baited traps. Except forD. suzukii,no other exotic drosofilid wascaptured from the fruit collection.Z. indianuswas never observed.Analyses of the presence of the different species, seasonal occurrenceand sex ratio are provided.