Mitochondrial 16s rDNAwas sequenced fromninedifferentpopulationsofAphelinidae and 10 of aphidiinae. Sequence divergences between populations within a species are low, ranging from 0 to 0.38%. Divergences among species within the same genus range from 0 to 8.71%. Aphelinus asychisWalker has a sequence divergence from the otherAphelinus spp. of 8.71%,which is evenhigher than the divergences among...

Woolly apple aphid, Eriosoma lanigerum (Hausmann), has become a pest of increasing importance in Washington apple orchards in the past decade. The increase in aphid outbreaks appears to be associated with changes in pesticide programs and disruption of biological control. We sampled woolly apple aphid colonies in central Washington apple orchards for natural enemies of this pest from 2006 to 2...

Soybean aphid is an economic pest of soybean in North America. Currently, management of soybean aphid is achieved through the use of foliar- and seed-applied insecticides. However, natural enemies play an important role in regulating soybean aphid populations, and may be adversely affected by insecticides. The effects of imidacloprid and thiamethoxam seed treatments on the soybean aphid parasit...

The tea aphid ( Toxoptera aurantii Boyer de Fonscolombe) is an important plant pest insect worldwide. parasitoid wasp, Aphelinus sp., one of the most natural enemies in China. Unfortunately, sp. alone cannot effectively control outbreaks under conditions. In this study, 27 volatile compounds from aphid-injured shoots, flowers, sex pheromones, or body rinses were selected and tested Y-tube olfac...

Diversifying agroecosystems through habitat management inside or outside production fields can provide alternative hosts and/or prey for natural enemies. In semi-natural habitats, parasitoids may find host-plant complexes (HPC) that could allow their development when pest are scarce in the field. However, morphological and physiological differences between targeted HPCs affect preference fitnes...