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Amaranthus hypochondriacus is a C 4 pseudocereal crop capable of producing reasonable grain yields in adverse environmental conditions that limit cereal performance. It accumulates trypsin inhibitors and α-amylase inhibitors in seeds and leaves that are considered to act as insect feeding...
Ovipositing female Nantucket pine tip moth, Rhyacionia frustrana , prefer loblolly pine, Pinus taeda L., to slash pine, Pinus elliottii Engelm. except during the first spring following planting of seedlings. Host discrimination by R. frustrana increases as seedlings develop, suggesting that...
Laboratory and field studies were conducted on the oviposition behavior of the pathogen-vectoring mosquito, Culex quinquefasciatus , in response to the oviposition pheromone 6-acetoxy-5-hexadecanolide, produced from a renewable plant resource, Kochia scoparia (Chenopodiaceae) (plant-derived...
Insect OS-D-like proteins, also known as chemosensory (CSP) or sensory appendage proteins (SAP), are broadly expressed in various insect tissues, where they are thought to bind short to medium chain length fatty acids and their derivatives. Although their specific function remains uncertain,...
Three humic substances—humic acid, fulvic acid, and humin—were isolated from soils located in the northern and southern forests of the Yuanyang Lake Nature Preserve in northern Taiwan's Ilan County. Aqueous extracts of fresh wet soil and of three humic substances, at concentrations of 0.125,...
Gallic acid and hydroquinone have been identified as the major allelochemicals of the known allelopathic plant Polygonella myriophylla . Both of these compounds occur in the foliage as glycosides. Quercetin and rhamnetin were identified as the major flavonoid constituents, but in much lower...
Many species of tenebrionid beetles produce and secrete benzoquinones from specialized prothoracic and postabdominal glands. Tribolium confusum produces two compounds methyl-1,4-benzoquinone (MBQ) and ethyl-1,4-benzoquinone (EBQ). These compounds are hypothesized to function as external defense...
The potential for pheromone-based mating disruption of the olive pyralid moth (OPM), Euzophera pinguis , in olive groves was investigated during the second flight period in small-plot trials in 2002. The female of this species emits a blend of (9 Z ,12 E )-tetradecadien-1-ol and (9 Z ,12 E...
We report the chemical composition of the floral rewards and the fragrance of 10 Maxillariinae (Orchidaceae) species. The species that offer rewards (labellar secretions) are usually scentless, the rewards being collected by bees. Chemical analyses revealed that the major chemical class of...
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