All are true regarding DDT, EXCEPT:
DDT (Dichloro diphenyl trichloroethane)
♦It was first synthesized in by a German chemist, Ziedler.
♦Its insecticidal action was described by Paul Muller.
♦It is primarily a contact poison.
♦It acts on nervous system of insects.
♦It takes several hours to kill the insect.
♦The residual action of DDT may last as long as 18 months.
♦It has no repellent action on insects.
♦As a residual spray, DDT is applied at a dosage of 100–200 mg/ sq. foot area.
♦The formulation of choice is a 5 % suspension, 5–10 % strength for the control of lice, fleas, ticks, and bugs.
It acts as neurotoxin
It is primarily a contact poison
It does not cause immediate death, but it takes several hours to kill
It has repellent action on insects