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The proportion of monoterpenes and enantiomeric ratios of chiral monoterpenes were determined in two susceptible and two resistant varieties of Scotch pine, Pinus sylvestris , by capillary GC analysis of headspace volatiles emitted by 9-year-old trees. Half the trees sampled in each variety had...
The impact of current-year foliage from the middle or lower crown section of balsam fir trees on larval growth, development, nitrogen, and food utilization was studied with laboratory rearing experiments, gravimetric analyses, and foliage chemical analyses. Pupal dry weight, pupal nitrogen...
The unusual venom of Apis cerana contains large oily droplets within an otherwise aqueous secretion. Chemical analysis (GC-MS) revealed that the venom oil consists of ( Z )-11-eicosen-1-ol (81.2%), other linear alcohols (7.7%), and linear hydrocarbons (11.1%). The eicosenol is present in...
Lanierone strongly synergized the attraction of male and female Ips pini (Say) to ipsdienol in New York and Wisconsin. Synergy was only weakly significant in Montana and British Columbia and not significant in California. Catches of I. pini in ipsdienol-baited traps were increased 0% ( i.e.,...
We studied the response of a predatory thrips, Scolothrips takahashii , towards herbivore-induced plant volatiles emitted by Lima bean plants infested by two-spotted spider mites Tetranychus urticae (green form). Tests were conducted with a Y-tube olfactometer in the laboratory and with traps...
Regurgitates of the grasshopper Schistocerca americana were deterrent to Crematogaster ants. Regurgitates obtained from insects fed upon wheat seedlings were more strongly deterrent than those obtained from insects fed on romaine lettuce leaves. After extraction of the regurgitates with ethyl...
Phytotoxic properties of vulpia ( V. myuros ) residue extracts on wheat ( Triticum aestivum L. cv. Vulcan) were examined in the laboratory. Vulpia residues contained water-soluble materials that were toxic to germination and to coleoptile and root growth of wheat. There were strong correlations...
The defensive secretion of Sipyloidea sipylus was analyzed using a GC-MS technique. Five chemicals were identified (diethyl ether, acetic acid, benzaldehyde, limonene, and benzothiazole) and mixed in about the same ratio as detected in the secretion to determine the potential effectiveness of...
To identify sex pheromone components in Drosophila ananassae , the cuticular hydrocarbons were analyzed and bioassayed. After silicic acid and two silver nitrate–silicic acid chromatographic steps, active fractions containing ( Z , Z )-5,25- and ( Z , Z )-4,26-hentriacontadiene as the most...
Adult Sehirus cinctus cinctus emit a volatile secretion from their metathoracic scent glands when tactually stimulated. We identified the volatile components by gas chromatography, high-performance liquid chromatography, and mass spectrometry. The secretion of both sexes contained (1 R...
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