That's a good question. I think the answer to your question comes from understanding the successional patterns that are associated with different levels of outbreak and the relation of species to site characteristics.
Within our project, there has been quite a bit of interest in looking at beneficial effects that have been observed with having mixed species, as in hardwoods mixed in with balsam fir. We've seen it over and over again, when we have a Ph.D. student determining the mechanism of it, but it seems to be associated with parasitoids and a richer parasitoid diversity in these mixed species. Some of them require other hardwood alternate hosts in that, so there is definitely a benefit of that.
We've found that it occurs not only within stands, but it also occurs across landscapes. If you have a plantation that's next to a mixed wood stand, there may be a benefit, within a certain range of that.
Planning the forest landscape also gets into products and what you're trying to grow and what you're going to use them for, so that partly has to be considered, as well as planning for diversity across it and trying to cultivate that. One of the things that you would try to do is alter the age-class distribution, as well as the species composition, on a landscape basis.
There have been lots of theories about that for decades, but as I indicated on my last recommendation, it's very difficult to do on a meaningful scale because it really requires a large landscape. I think that is where one of your recommendations could be to try to facilitate that through partnerships in different regions across Canada with different forest pests.