Diamonback moth, Plutella xylostella (L.) feeding and oviposition preferences on glossy and waxy Brassica rapa (L.) lines
2002
Ulmer, B. | Gillott, C. | Woods, D. | Erlandson, M.
Host plant resistance research to date indicates that Brassica plants expressing the glossy leaf wax characteristic show some resistance to diamondback moth, Plutella zylostella (L.). In the present study oviposition and first-instar feeding preferences were examined on G̀lossy' and Ẁaxy' near isogenic lines of Brassica rapa (L.). Feeding preference, growth and survival of later instar diamondback moth larvae also were examined. Although females did not discriminate between Ẁaxy' and G̀lossy' plants for oviposition, there was a strong preference among first-instar larvae for Ẁaxy' plants in the choice experiment. There were no significant differences in larval survival or fourth-instar feeding preference on any of the lines tested. The present experiment indicates that B. rapa expressing the glossy leaf wax characteristic shows some resistance to diamondback moth, similar to that observed previously with glossy B. oleracea. The resistance appears to have a behavioural basis and is expressed against early instar larvae.
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