Environmental Entomology (1992) 21, 771-779

Kenneth F. Raffa, David J. Hall, William Kearby and Steven Katovich (1992)
Seasonal life history of introduced basswood thrips (Thysanoptera: Thripidae) in Wisconsin, with observations on associated thrips species
Environmental Entomology 21 (4), 771-779
Abstract: Thrips calcaratus Uzel is an introduced pest of basswood trees in North America. Its basic biology and life history are unknown because it is not injurious in its native European range. In the present study, the general life history of T. calcaratus in Wisconsin was determined using emergence trapping, foliar sampling, and soil extraction. This species is univoltine; overwintered adults emerge from the soil in early spring, feed on buds as they open, and oviposit into the major veins on the undersides of leaves. The larvae feed on leaves, descend to the soil, and pupate. Degree-day models were computed for the free-living stages of T. calcaratus and its host plant phenology. There is close synchrony between T. calcaratus emergence and basswood bud swelling and opening. Populations of three thrips associates - the pear thrips, Taeniothrips inconsequens (Uzel); the native basswood thrips, Neohydatothrips tiliae (Hood); and the predacious black hunter thrips, Leptothrips mali (Fitch)-were also monitored. The pear thrips is an introduced polyphagous pest that has caused severe damage to eastern maples and western fruit orchards but has not been heretofore reported in midwestern states.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Kenneth F. Raffa

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
population dynamics/ epidemiology
Research topic(s) for beneficials or antagonists:
population dynamics/epizootiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Taeniothrips inconsequens		U.S.A. (mid N)
	Thrips calcaratus	Lime tree/linden (Tilia)	U.S.A. (mid N)
	Neohydatothrips tiliae	Lime tree/linden (Tilia)	U.S.A. (mid N)
Leptothrips mali (predator)			U.S.A. (mid N)