Not pesticides. Pyrethroid insecticides. (E.g. mentioned fipronil) But only when they're used at a wrong time. Glyphosate and neonicotinoids are very likely not

Not pesticides. Pyrethroid insecticides. (E.g. mentioned fipronil) But only when they're used at a wrong time. Glyphosate and neonicotinoids are very likely not responsible at all. There are a few common diseases that are wiping whole colonies as you said. Lack of flowering grasses as they were replaced with fields does not help. No food means dead bees.