Abstract
NeonatePlutella xylostella moved more rapidly, spent more time walking, and engaged in searching behaviors more often on leaves of NY 8329, a resistant cabbage with glossy leaves, than on Round-Up, a susceptible variety with normal wax bloom. The neonates also spent significantly more time palpating and more time biting and spinning silk on the susceptible cabbage (although the latter two differences were not significant). Very similar differences in neonate behavior occurred on leaf surface wax extracts (hexane and dichloromethane) of the two cabbage genotypes. Leaf surface waxes are thus strongly implicated in eliciting reduced acceptance of the glossy cabbage by neonateP. xylostella. The chemical compositions of the leaf wax extracts were markedly different. Several compounds, including the triterpenolsα- andβ-amyrin, were found only in the glossy waxes. The percentages of some major wax constituents differed between wax extracts of the two cabbage types. These differences in wax composition may condition the plant resistance in glossy types.
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Eigenbrode, S.D., Espelie, K.E. & Shelton, A.M. Behavior of neonate diamondback moth larvae [Plutella xylostella (L.)] on leaves and on extracted leaf waxes of resistant and susceptible cabbages. J Chem Ecol 17, 1691–1704 (1991). https://doi.org/10.1007/BF00984697
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DOI: https://doi.org/10.1007/BF00984697