Graduate Thesis Or Dissertation

Regional population dynamics of Argyrotaenia citrana in Northwest caneberry : phenology, overwintering survivorship, and movement as measured by pheromone traps and larval sampling

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  • Developmental requirements were determined for both larva and pupa as 503 and 176 degree-days (dd) above a lower threshold of 5°C. Adult emergence occurred from 300 to 700 dd accumulated from January 1st. Cumulative male emergence preceded female's by 50 - 80 dd. A PETE phenology model modified to include a temperature-dependent female activity function to regulate oviposition significantly improved prediction of egg hatch. Two pheromone trap catch peaks occurred in fields with overwintering populations. The first coincided with peak male emergence; as female emergence peaked, pheromone trap catches declined. The second peak occurred after 750 dd and varied in size with the first peak. The influence of female moth/pheromone trap competition on temporal patterns of trap catch was studied in a semi-enclosed courtyard. Three distinct periods of pheromone trap catch interpretation each bounded by a specific ratio of active males-to-calling females were seen. Two trap catch peaks typically occurred. Field sampling of overwintering populations, laboratory temperature bioassays, and controlled field experiments demonstrated that age-specific differences in cold hardiness exist among larval stages and correlation of historical winter temperatures with pheromone trap catch suggests winter severity is a major factor influencing the timing of spring emergence. A large grid of pheromone traps combined with larval sampling were used to assess regional overwintering survivorship and seasonal movement patterns. Populations overwintered primarily in marionberry fields within compact masses of dead leaves tied with canes on wire trellises. Capture of males was affected by temperature, wind direction, mating status of the population, and vegetational structure surrounding each trap. Summer larval samples indicate females dispersed into caneberry sites adjacent to marionberry fields.
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