A follow-up (1985, 1990, 1991) study revealed in female workers of hydroponic 
hothouses an increase of the incidence of nervous system diseases depending on 
the length of work (vegeto-vascular dystonia, angiodystonic syndromes, 
vegeto-sensory polyneuropathy). It is suggested that the main cause of nervous 
lesions in these cases was the complex effect of pesticides.