Effect of verbena as a trap crop on incidence of Tomato spotted wilt virus in chrysanthemums
Matsuura S1, Hoshino S1, Koga H2
1Hiroshima Prefectural Agriculture Research Center, Higashi-hiroshima, Hiroshima 739-0151, Japan.
2Taiyo Corporation Co. Ltd, Higashi-yodogawa, Osaka 533-0023, Japan
Correspondence: s-matsuura81314@pref.hiroshima.jp
The effect was investigated of verbena as a trap crop on the occurrence of western flower thrips, Frankliniella occidentalis, and the incidence of TSWV in chrysanthemums. Verbena cvs Pink Parfait and/or Fancy Parfait were cultivated alongside chrysanthemum cv. Jimba in a greenhouse at the proportion of 17¨C25% of chrysanthemum plants. Verbena cultivation suppressed the occurrence of western flower thrips on chrysanthemum until flower bud initiation by attracting vector thrips, and reduced TSWV incidence in the chrysanthemums up to flowering to 13¨C18% of untreated controls. We found that linalool oxide (pyran), an attractive volatile for vector thrips (Hooper et al. 1999: Pestic Sci 55:660¨C662), was mainly produced by the flower of verbena cv. Fancy Parfait and the ratio of cis and trans-type was 1 : 5. Our results suggest that cultivation of verbena as a trap crop suppresses TSWV incidence in the chrysanthemums up to the flowering stage and has the potential to be utilized as a control measure in IPM programs.
