Dose of DDT for effective control of mosquitoes is -: (A) 1-2 g/m2, (B) 5-6 g/m2, (C) 2-4 g/m2, (D) 2-4 g/m2
Answer is A. DDT: DDT is an indoor residual spray DDT is the insecticide of choice and dosage of 1-2 grams of pure DDT per sq.metre are applied 1-3 times a year to walls and other surfaces where mosquitoes rest. Duration of effectiveness is 6 to 12 months Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 833