Environmental Entomology (1995) 24, 233-238

David A.J. Teulon and E. Alan Cameron (1995)
Within-tree distribution of pear thrips (Thysanoptera: Thripidae) in sugar maple
Environmental Entomology 24 (2), 233-238
Abstract: Within-tree distribution of pear thrips, Taeniothrips inconsequens (Uzel), in sugar maple, Acer saccharum Marsh., was determined in six nonflowering trees in 1990 and six flowering trees in 1992. During budburst, vegetative (1990) and flower (1992) buds were sampled from four cardinal quadrants, two canopy positions (inside and outside), and three crown levels (upper, middle, and lower) of sugar, maples in a plantation in central Pennsylvania and examined for thrips eggs and adults. Almost all thrips adults were identified as T. inconsequens (94.9% in 1990 and 97.0% in 1992) and all eggs were likely to be from T. inconsequens because of their position in bud tissues and their morphology. Few larvae were present. Thrips eggs and adults were found in vegetative and flower buds throughout all levels, positions and quadrants. There were few significant differences in relation to any part of the tree in either year. In 1990 significantly more eggs (but not adults) were found in the middle level, compared with the lower and the upper levels. There was a significant interaction between height and quadrant for eggs (but not adults) in 1992. Within-tree distribution of pear thrips is likely to be affected by the synchrony between thrips emergence from overwintering sites and the timing of budburst in a particular position within the tree, and the distribution and density of flowers.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): David A.J. Teulon

Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Taeniothrips inconsequens	Maple (Acer)	U.S.A. (NE)