Colour preference and potato cultivar oviposition choice by onion thrips,Thrips tabaci (Thysanoptera: Thripidae) |
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| Institution: | 1. Tasmanian Institute of Agriculture, University of Tasmania, Hobart, Tasmania, Australia;2. Department of Primary Industries, Parks, Water and Environment, Kings Meadows Tasmania, Australia;1. Department of Entomology, National Chung Hsing University, Taichung, Taiwan;2. Department of Applied Biological Science, Faculty of Agriculture, Saga University, Japan;1. Department of Agricultural Biology, National Institute of Agricultural Sciences, Rural Development Administration, Geumpyeong-ri, Iseo-myeon, Wanju-gun, Jeollabuk-do, Iseo-myeon 55365, Republic of Korea;2. TheragenEtex Bio Institute, TheragenEtex, Suwon, Republic of Korea;1. Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, P.O. Box 14115-336, Tehran, Iran;2. Montana State University, Department of Research Centers, Western Triangle Agricultural Research Center, Conrad, MT 59425, USA;1. Department of Agicultural Entomology, All-Russian Research Institute of Plant Protection (VIZR), 3, Podbelsky shosse, Pushkin, St. Petersburg 196608, Russia;2. Department of Microbiological Plant Protection, All-Russian Research Institute of Plant Protection (VIZR), 3, Podbelsky shosse, Pushkin, St. Petersburg, 196608, Russia;3. Department of Biochemistry and Molecular Biology, Federal Research Center the N.I.Vavilov All-Russian Institute of Plant Genetic Resources (VIR), 42-44, B.Morskaya Street, St. Petersburg 190000, Russia;4. Plant Biology and Crop Science Department, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK;1. National Museums of Scotland Collection Centre, 242 West Granton Rd, Edinburgh EH5 1JA., Scotland, UK;2. Bogor Agricultural University, Kampus IPB, Dramaga Bogor, 16680, West Java, Indonesia |
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| Abstract: | Thrips tabaci (Lindeman) is an important polyphagous pest, and vector of Tomato spotted wilt virus responsible for sporadic, but devastating epidemics in potato. T. tabaci shows significant preferential differences between potato cultivars that may be important for field resistance. To investigate the role of visual cues in host choice we tested colour preference using two-choice assays. Thrips tabaci showed a significant preference for mid-green over red, blue, and white coloured cards, a preference for both light-green and mid-green over dark-green, and light-green over yellow, but no preferential difference between mid-green and yellow, and between light-green and mid-green. Analysis of the spectral reflectance of potato cultivars differing in thrips preference, revealed significant differences within the 400–700 nm wavelengths. In most cases cultivars preferred by T. tabaci had lighter green foliage and higher reflectance at 552 nm, and thus colour preference may be important for host selection. Oviposition choice of T. tabaci for potato cultivars was determined from counts of larvae and unhatched eggs from leaf disks under choice and no-choice conditions. In contrast to the colour choice experiments, onion thrips showed oviposition preference for cultivars with darker green foliage and lower reflectance at 552 nm. |
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