Environmental Entomology (1981) 10, 62-64

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B.V. Ouayogode and D.W. Davis (1981)
Feeding by selected predators on alfalfa weevil larvae
Environmental Entomology 10 (1), 62-64
Abstract: Twelve species of field-collected arthropod predators suspected of feeding on alfalfa weevil Hypera postica (Gyllenhal) (Coleoptera: Curculionidae) larvae were studied in the laboratory. Most experiments used weevil instars III and IV. In one type of test, weevil larvae were the only prey; the other type permitted a choice of weevil larvae, Lygus spp. nymphs and pea aphid adults Acyrthosiphon pisum (Harris). Hippodamia convergens (Guérin) (larvae and adults), Coccinella transversoguttata (Faldermann) (adults), Nabis spp. (adults), and Chrysopa oculata (Say) (larvae) preferred aphids. In the absence of aphids, the coccinellids were active weevil predators. The spiders Tibellus oblongus (Walckenaer) and Xysticus sp.; Collops vittatus (Say), Collops bipunctatus (Say) and Forficula auricularia Linn. (all adults), appeared to be opportunistic feeders. The latter ranked among the more effective weevil predators. Agulla sp. (adults) ate very few weevil larvae. Instar IV prey were too large for some smaller predators.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Hypera postica Alfalfa/lucerne (Medicago sativa) U.S.A. (SW)
Coccinella transversoguttata (predator) U.S.A. (SW)
Chrysopa oculata (predator) U.S.A. (SW)
Hippodamia convergens (predator) U.S.A. (SW)
Forficula auricularia (predator) U.S.A. (SW)
Philonthus cognatus (predator) U.S.A. (SW)
Nabis alternatus (predator) U.S.A. (SW)
Collops vittatus (predator) U.S.A. (SW)
Nabis ferus (predator) U.S.A. (SW)
Tibellus oblongus (predator) U.S.A. (SW)