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Two parasitoid wasps, Torymus artemisiae Mayr and Torymoides violaceus (Nikol’skaya), were reared on Artemisia herba-alba (Asteraceae) galles, in central Iran. Torymus artemisiae and T. violaceus were developed from the gall midges: Rhopalomyia navasi Tavares and R. hispanica Tavares, respectively. The occurrence of these two parasitic wasps in Iran, and their associations with R. navasi and R. hispanica, are new. Data on the wasps’ biological associations and geographical distribution are provided. The parasitoid compositions of the genus Rhopalomyia (Diptera: Cecidomyiidae) were also discussed.
During 2004-2005 the analytical studies were conducted on the species composition of galls occurring on the leaves of Fagus sylvatica L. in three localities: the Wolski Forest - near an urban agglomeration of Kraków, the Ojców National Park and the Andrychów Forest District (the Katowice Forest Region). A total of 21,333 galls, including 10,590 in 2004, were found. The galls represented 5 maker - species including 2 subspecies: Aceria nervisequa faginea (Nalepa), A. nervisequa nervisequa (Canestrini), A. stenaspis plicans (Nalepa), A. stenaspis stenaspis (Nalepa), Contarinia fagi Rübsaamen, Hartigiola annulipes (Hartig) and Mikiola fagi (Hartig). The species composition of galls was similar in all three localities. Aceria nervisequa faginea was the most abundant species. The index of occurrence frequency and the Agrell's index of species co-occurrence have been calculated.
During 2008-2009 the analytical studies were conducted on the species composition of galls occurring on the leaves of Fraxinus excelsior L. in localities: the Ojców National Park and the Przedborski Protected Landscape. A total of 3788 galls, including 1897 in 2008, were found. The galls represented 5 maker-species: Phyllocoptes epiphyllus (Nal.) (Acarina, Eriophyidae), Psyllopsis fraxini L., Prociphilus fraxini (Fabr.) (Homoptera, Psyllidae), Dasineura fraxinea (Kief.) and Dasineura fraxini (Bremi) (Diptera, Cecidomyiidae). The species composition of galls was similar in two localities. Psyllopsis fraxini was the most abundant species. The index of occurrence frequency and the Agrell's index of species co-occurrence have been calculated. It was shown that the strongest bond existed between Dasineura fraxinea and Psyllopsis fraxini in both localities.
In 1993–1997 the occurrence of cabbage aphid (Brevicoryne brassicae L.) and predators from Cecidomyiidae, Coccinellidae and Chrysopidae was observed on the nine different late cabbage vegetables; Savoy cabbage cv. ‘Vertus’, white cabbage cv. ‘Amager’, red cabbage cv. ‘Langendijker’, brussel sprouts cv. ‘Maczuga’, cauliflower cv. ‘Pionier’, blue kohlrabi cv. ‘Masłowa’, white kohlrabi cv. ‘Delikates’, kale cv. ‘Zielony Kędzierzawy’ and broccoli cv. ‘Piast’. Among the examined predators only the cecidomyiid – Aphidoletes aphidimyza Rond. (Cecidomyiidae) played an important role in reducing the number of cabbage aphids. The cruciferous species had no impact on the density of A. aphidimyza population, and females laying eggs. The size of aphid colonies on cabbage leaves played the most important role.
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