Book chapters by Lena Ansebo
Andréasson, Anna; Jakobsson, Anna; Gräslund Berg, Elisabeth; Heimdahl, Jens; Larsson, Inger; Persson, Erik (eds.): Sources to the history of gardening, 2014
Papers by Lena Ansebo
Journal of Agricultural and Food Chemistry, 2001
Volatile compounds were collected from apple branches (Malus domestica) at different developmenta... more Volatile compounds were collected from apple branches (Malus domestica) at different developmental stages, and the antennal response of codling moth females (Cydia pomonella) to these compounds was recorded by electroantennography coupled to gas chromatography. Presence of a range of terpenoid compounds, many of which had antennal activity, was characteristic for volatile collections from branches with leaves, and from small green apples. Nine compounds from branches with leaves and green fruit consistently elicited an antennal response: methyl salicylate, (E)--farnesene, -caryophyllene, 4,8-dimethyl-1,3(E),7-nonatriene, (Z)3-hexenol, (Z,E)-R-farnesene, linalool, germacrene D, and (E,E)-R-farnesene. The bouquet emitted from flowering branches contained in addition several benzenoid compounds which were not found after bloom. Small green apples, which are the main target of codling moth oviposition during the first seasonal flight period, released very few esters. In comparison, fully grown apples released a large number of esters, but fewer terpenoids. The study of apple volatiles eliciting an antennal response, together with a survey of the seasonal change in the release of these compounds, is the first step toward the identification of volatiles mediating host-finding and oviposition in codling moth females.
Chemoecology, 2005
Oviposition in wild codling moth females, collected as overwintering larvae from apple, pear and ... more Oviposition in wild codling moth females, collected as overwintering larvae from apple, pear and walnut, was stimulated by volatiles from fruit-bearing green branches of these respective hostplants. Analysis of headspace collections showed that eight compounds present in apple, pear and walnut elicited a reliable antennal response in codling moth females: (E)-β-ocimene, 4,8-dimethyl-1,(E)3,7nonatriene, (Z)3-hexenyl acetate, nonanal, β-caryophyllene, germacrene D, (E,E)-α-farnesene, and methyl salicylate. Any one of these compounds is found in many other nonhost plants, and host recognition in codling moth is thus likely encoded by a blend of volatiles. A large variation in the blend proportion of these compounds released from apple, pear and walnut suggests a considerable plasticity in the female response to host plant odours. Wild females, collected as overwintering larvae in the field, laid significantly fewer eggs in the absence of host plant volatiles. The offspring of these females, however, reared on a semi-artificial diet in the laboratory, laid as many eggs with or without plant volatile stimulus. Tests with individual females showed that this rapid change in oviposition behaviour may be explained by selection for females which oviposit in the absence of odour stimuli, rather than by preimaginal conditioning of insects when rearing them on semi-artificial diet. Oviposition bioassays using laboratory-reared females are therefore not suitable to identify the volatile compounds which stimulate egglaying in wild females.
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Book chapters by Lena Ansebo
Papers by Lena Ansebo