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Evaluation of Sampling Methodology for Determining the Population Dynamics of Onion Thrips (Thysanoptera: Thripidae) in Ontario Onion Fields

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Title: Evaluation of Sampling Methodology for Determining the Population Dynamics of Onion Thrips (Thysanoptera: Thripidae) in Ontario Onion Fields
Author: Macintyre-Allen, J.K.; Scott-Dupree, C.D.; Tolman, J.H.; Harris, C.R.
Abstract: Onion thrips, Thrips tabaci Lindeman, are an economic pest of alliums worldwide. In Ontario onion-growing regions, seasonal abundance and population trends of onion thrips are not well known. The objectives of this research were to investigate onion thrips population dynamics by using both white sticky traps and plant counts, to gain insight into ßight height, and to determine the genus and sex of thrips fauna present in monitored Þelds. Adult thrips were captured on white sticky traps placed in two commercial onion Þelds in the Thedford-Grand Bend Marsh region as early as mid-May in 2001, 2002, and 2003. Thrips were not recorded on onion plants in these Þelds until late June and early July. A comparison of sticky trap captures to plant counts revealed a strong, positive correlation, indicating that sticky traps, which consistently detected thrips earlier than plant counts, could be used instead of plant counts early in the season to monitor onion thrips populations. Pole traps placed in onion and an adjacent soybean, Glycine max (L.) Merr., Þeld revealed that regardless of crop type, most thrips were captured 0.7Ð0.95 m above the soil surface. During this study, 70% of 137,000 thrips captured on sticky traps and 89% of 1,482 thrips captured in pan traps were female onion thrips. No male onion thrips were identiÞed in this study; most of the remaining thrips were Frankliniella spp.
URI: http://hdl.handle.net/10214/2616
Date: 2005
Citation: Macintyre-Allen, J.K., Scott-Dupree, C.D., Tolman, J.H., and Harris, C.R. "Evaluation of Sampling Methodology for Determining the Population Dynamics of Onion Thrips (Thysanoptera: Thripidae) in Ontario Onion Fields." Journal of Economic Entomology 98.6 (2005): 2272-2281


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