I lost a hen today, and admittedly I haven't been spending much time with my flock lately because it's just been so bitterly cold. We posted her tonight because I couldn't figure out what got her, and it was very clear within minutes that she had a bad red mite infestation. We wormed about the 1st of October with Valbazen. Can we go ahead and Ivomec them (in addition to sevin dust) this soon after Valbazen? Most importantly, any suggestions for treating the coop with temps that aren't getting above 10*F (if we're lucky) for the daily high? This is our first opportunity to deal with this lovely issue, but I understand the best course of treatment for the coop is to fog with Permetherin. Does fogging work in these temps? Mostly we're seeing subzero temps, so this is going to be even worse (on us) than it might otherwise be.