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advisable Alsike American foulbrood apiary avoid bee veil Beekeeping in Ohio beginner in beekeeping black bees breeding queen brood-nest brood-rearing Bulletin clean hive cluster colony of bees comb honey Department of Agriculture desirable drawn comb early spring embedder empty hive entrance European foulbrood experienced beekeepers extracting super Farmers feeding full sheets hive body hive containing honey plants honey production inches increase infected Italian bees Italian queens larvae main honey-flow manipulations method modern hive necessary nectar normal colonies number of colonies old box hive old comb old hive open the hive Oregon Agricultural College pollen possible pounds prefer prevent propolis queen cells queen excluder queenless colonies requeen robbing satisfactory screen season shake the bees shaking treatment sheets of foundation side smoke strong colonies sugar sirup surplus swarm control tartaric acid temperature thru thruout top bars transferring weak colonies white clover wire worker bees worker comb young queen