it is difficult to genus of any micoorganism with out looking at it's
morphological stucture or more specific details. Fungi and moulds spread by
spores and or hypae (long braching struture of multinucleiated cells. As the
mature specimen is of only 1-2mm a rough guess would be spores as mode of
dispersal. I should imaging there are numerous fungle speciens that can
adhear to smooth surfaces like u have described.
sorry im not much help.
p.s. Do u know anything about microbial degradation of pestercides??