Which group of pesticides is the most persistent and least specific (broadest spectrum) ?

I think the appropriate answer for the above question is the Organochlorine insecticides which is a chemical pesticide. Their mode of action varies but mostly affects the nervous system, they are highly persistent, their sensitivity to insects is least specific (broad spectrum). Their long environmental persistence, results in fish, bird, and terrestrial animal death. The chemical groups of pesticides include the organophosphates and carbamates, organnochlorine, botanicals, synthetic pyrethroids, insect growth regulators and the microbials.