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Publication Date

Spring 2014

Degree Type

Thesis - Campus Access Only

Degree Name

Master of Science (MS)


Biological Sciences


Jeff Honda


bait traps, degree-days, developmental thresholds, light brown apple moth, pest forcasting, pheromone traps

Subject Areas

Entomology; Conservation biology


The light brown apple moth (LBAM), Epiphyas postvittana (Walker) is a highly polyphagous (> 500 host plant species), invasive moth native to south-eastern Australia and was first detected in California in 2006. LBAM is regulated by the USDA and CDFA under a Federal Domestic Quarantine Order. Trap data were collected over two years in Santa Cruz and Monterey Counties to identify a biofix event. Developmental thresholds for LBAM were validated by a constant temperature (20°C) rearing trial which produce a mean of 696.8 degree-days for complete development, similar to values reported in other studies. Degree-day information was fit to graphs of trap data to test the accuracy of the degree-day model as a viable forecasting tool. The goal of this research was to determine the forecasting ability of a degree-day model for LBAM using trap data. The trap data reliably identified a common biofix event for all trap regions. When the degree-day model was tested, 35.7% of theoretical peaks aligned with actual peaks in trap data.