Abstract Development time and observed mortality of Dendroctonus frontalis Zirnrn. in relation to changes in host-tree condition were studied in east Texas during the summer of 1977. Four indices of host condition were monitored: bark, phloem, and xylem moisture and...
Abstract Southern pine beetles were collected as they emerged from infested pine bolts and exposed in Petri dishes to α- and β-pinene for 20 hr. Changes in the volatile contents of the beetles' hindguts were detected by gas chromatography, and previously unidentified...
Abstract Bark beetles exposed to vapours of terpene hydrocarbons produce alcohols and ketones, apparently by oxidation at allylic positions. The predictability of such oxidations has now been extended to include non-terpenoid hydrocarbons. Exposure of Dendroctonus...
Abstract Bark beetles exposed to vapours of terpene hydrocarbons produce alcohols and ketones, apparently by oxidation at allylic positions. The predictability of such oxidations has now been extended to include non-terpenoid hydrocarbons. Exposure of Dendroctonus...
Abstract The practice of quantitatively sampling within-tree populations of Dendroctonus frontalis was investigated by comparing the relationships between sampling intensity, informational content of samples, and precision in estimation. Random and stratified random...
Abstract Field tests were conducted in East Texas in 1973-77 to evaluate the influence of 7 behavioral chemicals on the flight and landing behavior of the southern pine beetle, Dendroctonus frontalis Zimmerman. A mixture of frontalin plus host tree volatiles attracted...
Abstract Non-linear and linear models were compared to determine how well they described the within tree distribution of egg gallery constructed by the southern pine beetle attacking short leaf pine. The model which resulted in the best description, i.e., smallest...
Abstract The microflora of healthy larvae and adults of the southern pine beetle, Dendroctonus frontalis, were determined by aseptically excising portions of the fore-, mid-, and hindguts and culturing them on agar. Aerobacter aerogenes, Alcaligenes jaecalis, and...
Abstract Three methods for estimating the field developmental time of the southern pine beetle were compared. The estimates by each of the 3 methods were found to agree at high temperatures. Depending on the season of the year and temperature extremes, Method I (1st...