In this study we document associational susceptibility among hosts of the fall cankerworm (Alsophila pometaria).
The first goal of this paper is to document an example of associational susceptibility using the hosts of a common forest pest, the fall cankerworm (Alsophila pometaria).
Observationally, we evaluated host preference by estimating fall cankerworm egg densities on box elder and cottonwood.
These observational data suggest that the distribution of cankerworms is contingent on the distribution of box elder, and that cottonwoods growing with box elder are more susceptible to fall cankerworm than cottonwoods located in the open.
For example, Roland and Embree (1995) recorded the similar pattern of outbreaks of winter moth, Bruce's spanworm, and fall cankerworm in Nova Scotia Canada, and Klimetzek (1990) described a spatial synchronization of outbreaks of four pine-feeding insects in Germany.