Research Blog

Looking for updates and to follow the progress of the research? Lead researcher Dr. Rob Johns (Natural Resources Canada) and his team will provide project status updates on testing, results, analysis and updates on spruce budworm populations throughout the course of the project. 

Spruce Budworm has arrived - March 7, 2015

Spruce budworm has arrived in New Brunswick. In recent years the New Brunswick Department of Natural Resources in coordination with several local forestry groups (University of New Brunswick; Government of New Brunswick; Natural Resources Canada; Twin Rivers; Fornebu Lumber; J.D. Irving, Limited; AV Group; Acadian Timber; Forest Protection Limited) has intensified regional surveys for budworm, using a combination of both pheromone traps (to monitor adults) and branch sampling to determine densities of hibernating larvae (aka “L2 larvae”). Sampling for hibernating larvae involves snipping three branch tips (about 75 cm) in a plot (Picture 1) and then ‘washing’ these branches back in...

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Monitoring Spruce Budworm - July 18, 2014

Spruce budworm has more or less completed its feeding for this year in Atlantic Canada and has shifted into the adult moth stage to mate and lay eggs for the next generation. Migration of adult moths during this stage is often prolific and considerable research has been dedicated to understanding how these migratory events influence outbreaks. However, less is known of the migratory activity of spruce budworm as populations rise. In particular, it remains uncertain what conditions prompt moths to migrate away from (or to) a particular area, the importance of male vs. female migration, or how much these migratory...

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Budworm predators - June 16-25, 2014

Predators and parasitoids (a.k.a., natural enemies) are thought to be the primary agents keeping spruce budworm populations low during the years between outbreaks. These agents are also thought to be primarily responsible for driving populations back to low density at the end of an outbreak. Considerable work in the past 50 years has been dedicated to understanding the relationship between these natural enemies and the spruce budworm; however, our understanding of these interactions remains poor for rising spruce budworm populations. A key part of our research project is to determine whether insecticide treatments are able to suppress low density spruce budworm...

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Overmature trees more susceptible to insects and disease - June 3-5, 2014

As trees become old or ‘overmature’, many become more susceptible to insects and diseases. One of the major hypotheses generated during the early work of spruce budworm during the 1950’s was that outbreaks rose as trees matured and became a better food source for feeding spruce budworm larvae (aka the ‘Silvicultural’ hypothesis). Such increases in tree nutritional quality were speculated to allow populations to rise more quickly, thereby outstripping the ability of predators to exert control. The characteristic 35 year cycles of spruce budworm outbreak were thought to reflect the approximate 30-35 years required for maturation in balsam fir and spruce. Whether...

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Budworm studies start in Northern NB - May 26, 2014

April and May of 2014 have been busy months as we prepare for the upcoming spruce budworm studies in northern New Brunswick, about 60 km north of Edmundston (aka Hornes Gultch). This is the first region in New Brunswick where provincial surveys have detected more than a few overwintering spruce budworm larvae. The apparent rise of spruce budworm in this region is perhaps an indication of where the New Brunswick outbreaks might begin. Although it was clear that spruce budworm had risen somewhat in the area, we were still uncertain how large and widespread the population was. To carry out some...

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First Introductory Post

Spruce budworm is once again on the rise in eastern Canada. Spruce and fir forests in Quebec have already been subjected to nearly 3.2 million hectares of moderate to severe defoliation by spruce budworm as of 2006. So far, densities remain low in the province of New Brunswick; however, a small outbreak has developed only 50 km or so north of the New Brunswick border and is expected to continue spreading. With spruce budworm rising, the million-dollar questions are: How can we best manage spruce budworm outbreaks? What are the best strategies and tactics to control spruce budworm that minimize potential environmental impact? Our...

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