Interactions of the Invasive Fruit Flies Drosophila suzukii, Zaprionus indianus, Zaprionus tuberculatus and Ceratitis capitata with Their Hosts in the Brazilian Pampa Biome

Several fruit fly species in the Drosophilidae and Tephritidae families are classified as invasive pests worldwide. However, limited information is available on the occurrence of those dipteran species, their interactions, and their host plants in the Pampa Biome of southern Brazil. Therefore, we investigated interactions between invasive fruit flies and host plants. After two years (2022-2023) of fruit surveys, 3802 fruits from 16 plant species were harvested in the Pampa Biome's urban and rural areas. The collected fruits were conditioned in the laboratory. Emerged adult flies were identified and associated with the respective fruit species. The most abundant species detected were <i>Zaprionus indianus</i> (Gupta), followed by <i>Zaprionus tuberculatus</i> (Malloch), <i>Drosophila suzukii</i> (Matsumura), and <i>Ceratitis capitata</i> (Wiedemann). The invasive drosophilids <i>D. suzukii</i>, <i>Z. indianus</i> and <i>Z. tuberculatus</i> interacted with 10 host plant species each, whereas <i>C. capitata</i> was associated with seven host species. <i>Zaprionus indianus</i> showed the highest infestation rate on fruits collected from the ground, whereas <i>D. suzukii</i> had the highest infestation rate in fruits attached to plants. New host plants were identified for <i>Z. tuberculatus</i> and <i>C. capitata</i>. The findings of this study provide a valuable framework for more effective management and control strategies.