1st Place: Optimization of monitoring strategies and biopesticide efficacy for the control of Euproctis chrysorrhoea in Maine

Browntail Moth (BTM), Euproctis chrysorrhoea (Lepidoptera: Erebidae), is a non-native species currently outbreaking in Maine. BTM are polyphagous folivores and feed on a variety of woody plant species, including many economically and ecologically important ornamental and forest trees. Human health is also a concern as BTM larvae produce urticating hairs that can cause severe dermatitis to people. With the current population densities reaching a 100-year high, new monitoring and management programs are urgently needed. This research investigated the optimization of BTM sex pheromone monitoring traps in field trials during the adult flight period in 2021. Results indicate that male moths were more attracted to lures with > 95% purity, and bucket-style traps. 2022 trials will test additional trap styles and color variations to find a highly successful monitoring trap that can be used in a long-term regional monitoring program for BTM. In addition to monitoring, management strategies were considered for the control of BTM. Research looked at the efficacy of different commercially available Bacillus thuringiensis (Bt) products on both pre- and post-diapause larvae. Survival and defoliation rates were determined for the various Bt treatments alone and including the use of spider peptides, which have the potential to increase longevity and compound efficacy of Bt treatments. Preliminary analyses indicate that certain Bt products and combinations with peptides are more effective than others. The results of this research will allow for the adoption of new monitoring approaches and potentially reduce the use of broad-spectrum biopesticides to manage BTM.