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acariasis acid activity Agriculture american foul brood animals antibiotics apiarian apiary apiculture apiculturists Apilacum Apis mellifera Apis mellifera capensis apitoxin bacteriophag bee colonies bee hive bee-hive Bee-keeping Research Institute beekeeping biological breeding brood chambers Cabeza del Buey carried cent combs Congress Czechoslovakia dance decrease drone effect eggs entrance experiments factors feed fertilization flowers forest foul brood French fruit German glands harvest hive door honey bees honey production honeybee honeycombs honeydew important increase infected influence investigations Juan Manuel kindney larvae laying workers magnesite Malaga mated means measures metabolism method mixture nectar nest normal norms Nosema observed obtained Original text period phytoncidal plants pollination pollination by bees quantity queen substance queen-bee race ROMA FABREGA Royal Jelly samples seeds SEPULVEDA GIL Spain Spanish Cabeza stimulating sugar SUMMARY The author temperature tests tion treatment trees varieties Vyaznikovski weight winter worker bees yield young zone