Beginning in September the bees will begin raising their "winter bees", which have special traits to withstand the long winter. You want your winter bee larvae to have a minimum exposure to varroa transmitted viruses. The following week is about the last week to treat for varroa so that the exposure to viruses is minimized. Failure to treat will almost condemn your hive to death by viruses in January or February if not before. If your hive succumbs in September, October or early November many of your infected bees will flee to neighboring hives (both your's and your neighbor's hives) with their load of varroa and viruses. Do the right thing and treat your hives now!!!
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