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The epicuticular composition of different body parts of the Cabbage White, Pieris rapae L., was investigated using GC and GC/MS. The major group of components, hydrocarbons, occurs in two distinct classes, which show different distributions on the cuticle of the insects. Unbranched shorter chain...
Cuticular hydrocarbons were extracted from workers of 63 different nests of five species of Tetramorium ants (Hymenoptera: Formicidae) from Austria, Hungary, and Spain. The GC-MS data were classified (data mining) by self-organizing maps (SOM). SOM neurons derived from primary neuron separation...
A previous study showed that Sitka black-tailed deer ( Odocoileus hemionus sitkensis ) consumption was negatively correlated with monoterpene content in western redcedar ( Thuja plicata ). To test whether these monoterpenes were deterrent to Sitka black-tailed deer, we performed feeding choice...
Fungal infection of Chinese cabbage leaves by Alternaria brassicae has earlier been shown to have detrimental effects on larval development of the chrysomelid beetle Phaedon cochleariae . Furthermore, adults of this leaf beetle avoid fungus-infected Chinese cabbage leaves for oviposition and...
The sex pheromone of the American population of Lyonetia prunifoliella (Lepidoptera: Lyonetiidae) was reported to be composed of three components, 10,14-dimethyloctadec-1-ene (10me14me-1-ene-18Hy), 5,9-dimethyloctadecane (5me9me-18Hy), and 5,9-dimethylheptadecane (5me9me-17Hy). Studies with a...
The brown tree snake ( Boiga irregularis ) is an exotic pest species on Pacific islands, most notably on Guam where it has caused considerable ecological and economic damage. On Guam, the snake commonly associates with people and can be found near or in human habitations. Bites are common,...
Dufour's gland is the origin of the trail pheromone of Gnamptogenys striatula . Chemical analysis of the glandular extracts revealed a series of new natural products, especially esters of (2 E )-3,4,7-trimethyl-2,6-octadien-1-ol (4-methylgeraniol), and (2 E )-3,4,7-trimethyl-2,6-nonadien-1-ol (a...
Iridoid glycosides are a group of terpenoid secondary plant compounds known to deter generalist insect herbivores. In ribwort plantain ( Plantago lanceolata ), the iridoid glycosides aucubin and catalpol can be induced following damage by insect herbivores. In this study, we investigated whether...
Bruchins are 3-hydroxypropanoate esters of long-chain α,ω-diols from pea weevils and cowpea weevils that have been shown to initiate callus formation on pea pods at extremely low application rates. Synthetic analogs have been prepared and examined to evaluate structural requirements for...
We studied the interaction between plants (horsenettle; Solanum carolinense ) and herbivorous insects (flea beetles; Epitrix spp., and tobacco hornworm; Manduca sexta ) by focusing on three questions: (1) Does variation in nitrogen availability affect leaf chemistry as predicted by the...
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