Influence of temperature on spring flight initiation for southwestern ponderosa pine bark beetles (Coleoptera: Curculionidae, Scolytinae).

Determination of temperature requirements for many economically important insects is a cornerstone of pest management. For bark beetles (Coleoptera: Curculionidae, Scolytinae), this information can facilitate timing of management strategies. Our goals were to determine temperature predictors for flight initiation of three species of Ips bark beetles, five species of Dendroctonus bark beetles, and two genera of bark beetle predators, Enoclerus spp. (Coleoptera: Cleridae) and Temnochila chlorodia (Mannerheim) (Coleoptera: Ostomidae), in ponderosa pine forests of northcentral Arizona. We quantified beetle flight activity using data loggers and pheromone-baited funnel traps at 18 sites over 4 yr. Ambient air temperature was monitored using temperature data loggers located in close proximity to funnel traps. We analyzed degree-day accumulation and differences between minimum, average, and maximum ambient temperature for the week before and week of first beetle capture to calculate flight temperature thresholds. Degree-day accumulation was not a good predictor for initiation of beetle flight. For all species analyzed other than D. adjunctus Blandford, beetles were captured in traps only when springtime temperatures exceeded 15.0 degrees C. D. adjunctus was collected when maximum temperatures reached only 14.5 degrees C. Once initial flights had begun, beetles were often captured when maximum ambient air temperatures were below initial threshold temperatures. Maximum and average air temperatures were a better predictor for beetle flight initiation than minimum temperature. We establish a temperature range for effective monitoring of bark beetles and their predators, and we discuss the implications of our results under climate change scenarios.

Laboratory and field evaluations of two Bacillus thuringiensis formulations, Novodor and Raven, for control of cottonwood leaf beetle (Coleoptera: Chrysomelidae).

Laboratory and field experiments were conducted to determine the efficacy of two Bacillus thuringiensis Berliner formulations, Novodor and Raven, for controlling cottonwood leaf beetle, Chrysomela scripta F. (Coleoptera: Chrysomelidae). In laboratory bioassays, larvae or adults were added to petri dishes containing Populus x euramericana Guinier 'Eugenei' foliage that had been treated with distilled water (control) or one of the commercial Bt formulations at either high or low label rates. Survival was recorded on a 24-h basis, and leaf area consumed was measured at the conclusion of all trials. Significant differences from the control in mortality and leaf area consumption resulted in the Novodor and Raven treatments for all life stages tested; however, adults were better able to withstand the effects of B. thuringiensis toxins than were the immatures. Early- and late instar C. scripta populations were monitored in the field (1998 and 1999) after treatment with either water or various concentrations of one of the commercial Bt formulations. Significant mortality resulted with all concentrations and for all life stages tested compared with the control (tap water). The commercial formulations also were tested under plantation conditions as part of a long-term defoliation study. Both Novodor and Raven reduced cottonwood leaf beetle defoliation damage after a single application, giving high efficacy for control of cottonwood leaf beetle under the conditions and concentrations evaluated.

Modeling life satisfaction among the aged: a comparison of Chinese and Americans.

This paper reports on a survey conducted among elderly Chinese in Taiwan and Americans in eastern Oregon. The focus is on health status and selected social network characteristics (such as range, density, and percentage of relatives) as they relate to life satisfaction. In addition to examining differences among these and other variables in the two national samples, two hypotheses are tested using hierarchical regression analysis. The first hypothesis relates higher values of range and density to greater life satisfaction. The second is a test of the stress-buffering hypothesis. We then examine the data controlling for gender and conclude with a discussion and interpretation of both the national and gender differences yielded by this analysis.

Gender differences regarding peer influence and attitude toward substance abuse.

Gender role socialization differentially influences attitudes toward substance abuse for boys and girls. Students (n = 968, 456 = males, M age = 16.20, SD = 1.20) were administered a questionnaire to assess their perceptions of attitudes toward substance abuse. Boys' approval was significantly different than the level of approval estimated for girls on teenagers drinking beer or wine coolers chi 2 (4,n = 931) = 418.58, p < .00001, drinking hard liquor chi 2 (4,n = 921) = 432.49, p < .00001, driving after drinking chi 2 (4,n = 924) = 492.32, p < .00001, smoking marijuana chi 2 (4,n = 921) = 609.62, p < .00001, smoking cigarettes chi 2 (4,n = 927) = 480.35, p < .00001, taking diet pills to lose weight chi 2 (4,n = 914) = 185.05, p < .00001, and taking diet pills to get high chi 2 (4,n = 921) = 428.43, p < .00001. Teens viewed getting drunk at a party as more acceptable than driving after drinking 2 (4,n = 921) = 264.10, p < .00001, but gave boys more approval than girls for driving after drinking. Possible implications of these findings are discussed.