The mutagenic effect of pesticides on Escherichia coli WP2 try.

Thirty pesticides commercially available in Hungary and three well-known chemical mutagens were applied to agar plate cultures of her+ and her- derivatives of Escherichia coli WP2 try- strain. After incubation, the plates were examined for a relative increase in reverse mutation number. N-Trichloro methylthio-1,2,3,6-tetrahydrophthalimide, dimethyl-3,2-dichlorovinyl-phosphate and N-trichloro methylthiophyhalamide proved to have definite mutagenic activity.