The apricot aphid, Myzus mumecola (Matsumura) (Hemiptera: Aphididae), was detected for the first time in Europe in 2016. In the last years, M. mumecola has spread strongly in many European regions and also in South Tyrol (Italy) with heavy infestations on apricot orchards. There are hardly any study on the biology of this exotic host-alternating aphid and no precise information is available on its migration and secondar host choice. Recent investigations at Laimburg Research Center of South Tyrol proved that winged forms are present on apricot-infested trees between April and June, which are then leaving apricot trees to migrate to their summer hosts. However, there is no clear evidence to which botanical species they migrate to. In this research we aim to find the summer host of M. mumecola in South Tyrol. The experiment will be performed at the ‘Piglon’ apricot orchard, where untreated apricot trees are currently present, showing heavy infestations since spring 2021. In the surrounding area several botanical species typical of vineyards and forest landscape can be explored and the plant species on which M. mumecola will be found can be determined. Samples of the detected colonies will be frozen and compared in the laboratory with other aphid specimens already identified. In autumn it should be possible to find the gynoparae aphids flying back to apricot trees. Therefore, we also aim to determine the time when the aphids return to the apricot tree. Sample of apricot branches will be detected weekly until egg clusters appear. In addition, photos of the various stages (aphid on summer host, winged animals, males, nymphs, fondatrigenie) will be taken.