>We have mites that peak up in the spring if the colonies were not
> treated in the fall.

Since the mite population will continue to increase through the
broodrearing period, it would surprise me that it would *peak* in
spring.  I would expect the peak to occur in September.

> By the way, I have seen Chalkbrood killed colonies in Alberta. I have
> never seen this in my life, but it happened.

Were they Aussie bees?  It appears that some Aussie strains suffer
when exposed to North American strains of chalkbrood.

Randy Oliver

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