Acarologia (1999) 40, 191-197

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P.D. Pratt and B.A. Croft (1999)
Expanded distribution of the bamboo spider mite, Schizotetranychus longus (Acari: Tetranychidae), and predation by Neoseiulus fallacis (Acari: Phytoseiidae)
Acarologia 40 (2), 191-197
Abstract: Schizotetranychus longus Saito is a common pest of bamboo in Japan. We report its new occurrence in the Willamette Valley, Oregon, on bamboo. We assessed the ability of adult females of Neoseiulus fallacis (Garman), a native predaceous mite, to invade S. longus nests after construction times of 5 or 10 days. Frequency of predators in nests decreased, from 5 to 10 days, although the predator laid most of its eggs in nests irrespective of construction time. In choice tests, spider mite webbing was more attractive to N. fallacis than eggs, but similar to feces. Predators searched more in proximity to feces than eggs, but resting sites were equally common near both. Survival, activity and reproduction of N. fallacis when given excess of mixed life stages of S. longus, Tetranychus urticae Koch, pollen of Tulipa gesneriana L. or Pseudotsuga menzesii (Mirbel), or no food were measured by holding single adult female N. fallacis for 7 days. Survival, activity, oviposition and immature production of predators were alike for both spider mites, but lower (or higher activity) with pollens or when starved. To see if N. fallacis would, suppress S. longus under normal growing conditions, predators were added to infested Sasaella hidaensis (Makino and Uchida) var. 'Murai' plants, and mites were monitored thereafter for 5 weeks. N. fallacis significantly reduced levels of S. longus and the rates that it infested bamboo leaves; it nearly eliminated S. longus from plants at the end of the test.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Paul D. Pratt

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.

Stigmaeopsis longus Bamboo Japan
Stigmaeopsis longus Bamboo U.S.A. (NW)
Neoseiulus fallacis (predator) Stigmaeopsis longus Bamboo U.S.A. (NW)