Where do they diapause? On what hosts and what host-plants? In Brittany we have almost no idea what Aphidius ervi uses as refuges. Same thing in Canada for Aphidius avenaphis and ervi, we know they can overwinter next to the crops and be active in early spring but we have no details. The range of hosts in cultivated plants is well-known but I wonder what hosts they could use in more "natural" environments.
based on some reports from Iran some host have been reported for this parsitoid such as: Sitobion avenae and Diuraphis noxia, as in some ares in Iran wheat are cultivated during winter, in middle parts of Iran, i think its possible to record this parasitoid in such areas, however in other regions it has been mentioned that this wasp overwinter in other marrow leaf weeds(grasses)
Dear Kévin Tougeron
It is also found on Sitobion avenae and Russian Wheat Aphid wheat, barley in Aleppo, and the coastal regeons, also on potato aphids Myzus persicae in Damascus and Damascus countryside's and related weeds, Aphis pomi and alfalfa aphids and several aphids spp. Widely distributed in the regions. It could be found all sessions due to the alternative of aphids on weed hosts
Regards
Prof. Houda Kawas
Hello Dear
Aphidius ervi will consume all types of larger aphids, especially the potato aphid, Macrosiphum euphorbiae, and the glasshouse potato aphid, Aulacorthum solani. It also parasitizes Myzus persicae var. nicotianae, as well as aphids such as Sitobion sp., Schizaphis sp., Rhodobium sp., Acyrthosiphon pisum and others. Use Aphidius ervi especially when aphid infestations are just beginning as control will be easier to achieve early in the aphid population's growth. Best regads
In México A. ervi has been collected on Acyrthosiphon pisum, Diuraphis noxia, Myzus persicae, Sitobion sp. and Metopolophium dirhodum. We do not have records on where do they diapause, some collections has been obtainded from Triticum aestivum as a host plant
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