Science > Insect-Host Relationships

Insect-Host Relationships

Study Leader: David Roden
droden@NRCan.gc.ca

Study Description:

Predominant research activity for this study falls within the Enhanced Timber Production and Protection Network; however, there are aspects of studies and responsibilities that may fall within Forest Ecosystem Processes, Biodiversity, Forest Health, and Research Support. At the present time, the study is:

1. Identifying the effect of burlap-style banding material on the selection of resting locations by larval gypsy moth, the effect band material may have on insect behavior and the potential of using this knowledge, in combination with preferred and non-preferred host phytochemicals and larval compounds, for improving control methodologies and larval sampling.
2. Identifying and characterizing the pheromone thought to be associated with the spatial displacement of larval gypsy moth.
3. Evaluating the potential of introducing a foreign carabid predator into gypsy moth infested oak stands with the objective of importing and releasing the predator and, eventually, characterizing its pheromone.
4. Determining the Asian Long-horned Beetle (ALB) supercooling point, and
5. Developing a DNA marker for the ALB.

This year, under item 1, providing there is an adequately field population of gypsy moth to work with, we will retest an attractive phytochemical identified through NBF. Lab bioassays by D. Coma under item 2 have identified larval extracts from the methyl chloride fraction as attractive. Bioassays will continue throughout the year and will examine the different components of the fraction. Work with C. sycophanta (item 3 above) is presently on hold as we try to assess the potential of future studies. The CFIA decision to deny release of this predator was unsuspected given that 3 of the 4 reviewing scientist supported release of this predator. It may be possible to design experiments that will address their concerns or submitted an appeal. ALB supercooling point measurements (item 4) delayed because of problems with the equipment have been resolved and will be initiated this spring. As part of this study, internal and external over-wintering maple temperatures will be collected next winter to compliment supercooling measurements if equipment is available. Development of DNA markers (item 5)for the ALB are complete however, we are investigating the possibility of funds to develop a kit for these markers that could be marketed commercially. Collaborative ALB and PSB studies with the U.S. North Central Experimental Forest Station and Michigan State University will continue.