Organochlorines are insecticides with chlorine in the compound. Most are no longer in use, but a few are still around. Organochlorines affect the chlorine channel in nerve cell membranes, causing hyperexcitability and convulsions. Lindane is highly toxic to fish and bees. Dienochlor is highly toxic to fish, but non-toxic to bees.
Carbamates are derivatives of carbamic acid.
Carbamates, like organophoshates, inhibit acetylcholine-sterases enzymes in the nervous system. The result is a buildup of acetylcholine at nerve synapses, producing rapid twitching of voluntary muscles, and then paralysis. Carbaryl is a wide spectrum pesticide, lethal to many nontarget insects, including bees. Moderately toxic to fish and birds. As a class, OP s are the most toxic of all pesticides to vertebrates.