Dutch researchers have detected a cocktail of 14 different pesticides (fungicides, herbicides, insecticides) in bats. In dead individuals and manure classical insecticides such as DDT and permethrin were found, but the animals were also exposed to the neonicotinoids imidacloprid and thiamethoxam, the herbicides mecoprop and nicosulfuron, and the fungicides iprodione and propiconazole. Pesticides such as imidacloprid, propoxur, thiamethoxam, nicosulfuron and iprodione had not previously been reported to be present in bats. Permethrin - a wood preservative - was found in relatively high concentrations. The observed concentrations may not be acutely lethal to bats, but chronic effects including immune suppression, which would explain the endemic white nose syndrome that killed millions of bats in North America, can not be ruled out.
Wood beams used in hibernation are a likely source of exposure. The wooden beams of three places of bat residence contained 19 different pesticides, nine of which were found in dead bats and bat droppings. The wood is preserved with these pesticides. It is likely that insecticides originated from contaminated insect food.
Source: Blik op nieuws, 15-12-2016