The influence of turfgrass genotype (bermudagrass, Cynodon dactylon (L.), centipedegrass Eremochloa ophiuroides Munro Hack, St. Augustinegrass Stenotaphrum secundatum [Walt.] Kuntze, zoysiagrass, Zoysia spp., and tall fescue, Festuca arundinacea Schreb) on occurrence of hymenopteran parasitoids was evaluated in residential turf during May, June and July in 2005. Most wasps belonged to Chalcidoidea (55%) and Platygastroidea (29%). Adult wasps representing Mymaridae, Platygastridae, Scelionidae and Braconidae were captured in all turfgrasses. Among all wasps, 26.5% were mymarids and included Gonatocerus sp. and Mymar sp. Eulophidae, Aprostocetus and Pnigalio sp. were less abundant in centipedegrass compared with other turfgrasses. Trichogrammatids (18.2% of total wasps) were more abundant in St. Augustinegrass or tall fescue than in zoysiagrass. Platygastrid wasps, Allotropa and Fidiobia sp., were most often collected from zoysiagrass and St. Augustinegrass. Scelionids represented 23% of the total parasitoids collected. Baeus sp., a scelionid, was found in all turf types except in tall fescue, whereas another scelionid, Trimorus sp., was found among all turfgrass taxa. Figitids were most common in St. Augustinegrass, whereas a greater number of dryinid wasps were found in tall fescue than in all other turfgrasses. Vacuum sampling proved to be a better collecting technique than sweep netting for minute wasps. Chalcidoidea, particularly mymarids, eulophids and trichogrammatids, were abundant in July. Most aphelinid wasps were captured in June with none collected in July. Ichneumonids and braconids were more common in June than in July. Knowledge of species occurrence, abundance and distribution is important for conservation as well as pest management efforts. Our results demonstrate an abundant and diverse community of parasitic wasps in residential turfgrasses in central Georgia that could be a focus of conservation efforts.
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Vol. 46 • No. 2