Environmental Entomology (1986) 15, 1255-1263

J.J. Hadam, M.T. Aliniazee and B.A. Croft (1986)
Phytoseiid mites (Parasitiformes: Phytoseiidae) of major crops in Willamette Valley, Oregon, and pesticide resistance in Typhlodromus pyri Scheuten
Environmental Entomology 15 (6), 1255-1263
Abstract: A survey of 13 Willamette Valley, Oreg., commercial crops including apple, peach, prune-plum, cherry, filbert, grape, strawberry, raspberry, blackberry, corn, mint, and Christmas trees found Typhlodromus pyri Scheuten to be the principal phytoseiid present. Typhlodromus occidentalis Nesbitt, Amblyseius andersoni (Chant), A. aberrans (Oudemans), T. arboreus Chant, and A. fallacis (Garman) also were frequently collected. T. pyri was most prevalent on apple, prune, grape, and blackberry and usually on crops receiving few insecticide treatments. Seasonal differences in abundance were observed on some crops because T. pyri declined during mid- and late season as opposed to early season. T. occidentalis was significantly more abundant on apple and cherry than on other crops, and most prevalent in late season at heavily sprayed sites. A. andersoni was widespread among crops throughout the season but mostly limited to sites receiving few insecticide applications. A. aberrans was most abundant on filbert while A. fallacis was dominant on strawberry. T. arboreus was locally common on apple and prune. A slide-dip technique showed moderate resistance in T. pyri to azinphosmethyl (5- to 7-fold at the LC₅₀) and high resistance to carbaryl (25- to 28-fold) and parathion (ca. 100-fold) at heavily treated field sites.
(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:
surveys/distribution/isolation
resistance to pesticides

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
Neoseiulus fallacis (predator)			U.S.A. (NE)
Galendromus occidentalis (predator)			U.S.A. (NW)
Typhlodromus pyri (predator)			U.S.A. (NW)
Amblyseius andersoni (predator)			U.S.A. (NW)
Kampimodromus aberrans (predator)			U.S.A. (NW)
Metaseiulus arboreus (predator)			U.S.A. (NW)