Journal of Asia-Pacific Entomology

Korean Society of Applied Entomology (한국응용곤충학회)
권호 표지

Economic Thresholds of Western Flower Thrips (Thysanoptera: Thripidae) for Unripe Red Pepper in Greenhouse

  • Park, Hong-Hyun (Applied Entomology Division, National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Lee, Joon-Ho (Entomology Program, Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University) ;
  • Uhm, Ki-Baik (Applied Entomology Division, National Institute of Agricultural Science and Technology, Rural Development Administration)
  • Published : 2007.03.31
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Abstract

This study was conducted to develop economic thresholds of western flower thrips (Frankliniella occidentalis Pergande) for unripe red pepper in greenhouses. To investigate the relationship between the density of thrips and resulting damages, experimental plots with five treatments (0, 4, 16, 48, 96 adults per plot) as initial release densities were established at the National Institute of Agricultural Science and Technology, Suwon, Korea, in 2004. Western flower thrips density was monitored using flower samplings and yellow sticky trap $(8{\times}13\;cm)$ counts. Western flower thrips density was directly related to increased numbers of damaged fruits and reduced fruit yield. The number of marketable fruits produced decreased as the thrips densities increased. The major damage to pepper fruits caused by thrips was cosmetic scars that resulted from immature feeding. When flower samples or yellow trap caches were used to determine the density of thrips, which were collected on a previous sampling date, thrips densities were determined to be related to the percentage of fruits that were damaged, and a significant relationship was found for the flower samples $(y=0.3219x\;+\;1.0792,\;r^2=0.8640$ and for trap catches $(y=11.9209\;log(x)-2.158,\;r^2=0.8306)$. The economically-tolerable ratio of damaged fruits based on control cost and market values under current greenhouse cultivation was estimated as 3.4 to 8.0%. Economic thresholds of western flower thrips ranged from 0.7 to 2.1 adults or nymphs per flower, and 2.3 to 5.7 adults per four-day sticky card count.

Keywords

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