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The species complex and infestations of aphids on plum ( Prunus persica ) and cherry plum ( Prunus cerasifera ) in Bulgaria were investigated during the period 2013–2018. Nine species from the family  Aphididae  were found:  Brachycaudus helichrysi  Kaltenbach (leaf-curling plum aphid),  Hyalopterus pruni  Geoffroy (mealy plum aphid),  Phorodon humuli  Schrank (hop aphid),  Brachycaudus prunicola  Kaltenbach (brown plum aphid),  Brachycaudus cardui  Linnaeus (thistle aphid),  Brachycaudus persicae  Passerini (black peach aphid),  Rhopalosiphum nymphaeae  Linnaeus (waterlily aphid),  Aphis spiraecola  Patch (spiraea aphid) and  Pterochloroides persicae  Cholodkovsky (peach trunk aphid). The dominant species on plum are  Hyalopterus pruni  and  Brachycaudus helichrysi . The first species is more widespread and of significantly higher density. The dominant species on cherry plum are  Phorodon humuli  and  B. helichrysi . The species  Brachycaudus prunicola  is widespread both on plum and cherry plum in Bulgaria. It was found only on twigs, and therefore cannot be considered as a dangerous pest on fruit-bearing plum trees. The other species, some of them described as dangerous pests on plum, are today fairly rare and occur in low density, thus posing no danger to orchards.

Aphids (Hemiptera: Aphididae) on Plum and Cherry Plum in Bulgaria