"Here, we show that two neonicotinoids (4.5 ppb thiamethoxam and 1.5 ppb
clothianidin) significantly reduce the reproductive capacity of male
honeybees (drones), Apis mellifera"

http://rspb.royalsocietypublishing.org/content/283/1835/20160506
http://tinyurl.com/jj2blml

See figure 3

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