In a study of the parasitoid complex of the locust leaf miner Phyllonorycter robiniella (Clemens, 1859), 23 species of its parasitoids were recorded at 18 localities in Serbia. The parasitoid species included 2 species of the family Braconidae, 1 of the family Eupelmidae, and 20 of the family Eulophidae. The recorded species of parasitoids are polyphagous; in addition to Ph. robiniella, they also develop on other species of leaf miners as primary; primary and secondary; or primary, secondary, and tertiary parasitoids. Among the recorded species of parasitoids, the most significant were the species Pholetesor bicolor, Pholetesor nanus, Sympiesis sericeicornis, Sympiesis acalle, Minotetrastichus frontalis, Pediobius saulius, and Baryscapus nigroviolaceus. The parasitoids were found to have a strong effect on the abundance of Ph. robiniella because they reduced more than 50% of its larvae and pupae in the majority of study samples.
The aim of this research was to study the diversity of jumping plant-lice parasitoids and to investigate their potential in biological control applicable to cultivated and ornamental plants. Thirteen species from six genera of encyrtid wasps (Hymenoptera, Chalcidoidea, Encyrtidae) were reared from 24 species of jumping plant-lice (Hemiptera, Psylloidea) in Serbia. A total of 689 encyrtid wasps were collected since 2003 from 51 localities, reared from hosts. The richest genera are Psyllaephagus with four species (P. belanensis (Hoffer), P. fulvipes Erdös, P. procerus Mercet and Psyllaephagus sp.) and Syrphophagus with three species (S. aphidivorus (Mayr), S. taeniatus (Förster) and S. ariantes (Walker)). The most common species, comprising about half of the reared specimens, is Prionomitus mitratus (Dalman). Eight species are new to Serbia: Microterys annulatus (Erdös, 1957), Prionomitus tiliaris (Dalman), Psyllaephagus belanensis, P. fulvipes, P. procerus, Sectiliclava cleone (Walker), Syrphophagus ariantes and Trechnites flavipes (Mercet). Psyllaephagus fulvipes was reared from the nymphs of Craspedolepta conspersa (Löw), the only known host of this species so far. In the present study, 27 new host associations were found.
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