Abstract
Tomato spotted wilt virus (TSWV) causes sporadic but serious disease in Australian potato crops. TSWV is naturally spread to potato by thrips of which Thrips tabaci is the most important. Prior studies indicated possible non-preference of potato cultivars to T. tabaci. Select potato cultivars were assessed for non-preference to T. tabaci in paired and group choice trials. Cultivars ‘Bismark’, ‘Tasman’ and ‘King Edward’ were less preferred than ‘Atlantic’, ‘Russet Burbank’ and ‘Shepody’. Green leaf volatiles were sampled using solid-phase microextraction from the headspace of potato cultivars of two ages that differed in T. tabaci preference. Analysis of headspace volatile data using Receiver Operating Characteristic curves identified individual volatiles associated with T. tabaci preference and non-preference, young and old plants and individual cultivars. These data could be used to inform breeding programs for selection of T. tabaci resistance to assist with TSWV management, and biological testing of novel thrips management compounds.
Highlights
Virus diseases pose significant threats to productivity of most crop plants [1]
Tomato spotted wilt virus (TSWV) is naturally spread by certain thrips species and in Australia the most important for transmission of TSWV in potato is onion thrips (Thrips tabaci Lindeman) [5]
Disease-free plants of eight potato cultivars; ‘Atlantic’, ‘Bismark’, ‘Desiree’, ‘King Edward’, ‘Russet Burbank’, ‘Shepody’, ‘Spunta’ and ‘Tasman’, were grown from mini-tubers produced from axenic tissue-cultures in a in a high health insect-proofed glasshouse (16–22 ̊C) in plastic pots (20 cm in diameter, 20 cm in height, 4.7 L capacity) filled with potting mix containing sand, peat, and composted pine bark (10:10:80; pH 6.0) premixed with Osmocote 16–3.5–10 NPK resin-coated fertilizer
Summary
Virus diseases pose significant threats to productivity of most crop plants [1]. Potato (Solanum tuberosum L.), the world’s third largest staple food crop after wheat and rice, suffers from several virus diseases, exacerbated by vegetative propagation which can efficiently transfer virus infections between generations [2]. Infections with Tomato spotted wilt virus (TSWV) are generally rare [3], in Australia, major epidemics can occur which may lead to complete crop loss [4,5,6]. TSWV is naturally spread by certain thrips species and in Australia the most important for transmission of TSWV in potato is onion thrips (Thrips tabaci Lindeman) [5]. Prior observations comparing potato cultivars for resistance to TSWV revealed that in field exposure trials, cv.
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