Efficacy of thermal fog application of deltacide, a synergized mixture of pyrethroids, against Aedes aegypti, the vector of dengue


T. R. Mani (corresponding author), N. Arunachalam, R. Rajendran and A. P. Dash, Centre for Research in Medical Entomology (Indian Council of Medical Research), 4. Sarojini Street, Chinna Chokkikulam, Madurai – 625 002, Tamil Nadu, India. Tel.: +91 452 2531430; Fax: +91 452 2530660; E-mail: crmeicmr@icmr.org.in
K. Satyanarayana, Community Medicine Research, Department of Community Medicine, Dr. Pinnamaneni Siddhartha Institute of Medical Sciences and Research Foundation, Chinaoutpalli, Gannavaram Mandalam, Krishna District, Andhra Pradesh, India.


We evaluated the efficacy of indoor and peridomestic thermal fog applications of deltacide, a synergized mixture of pyrethroids (S-bioallethrin 0.7% w/v, deltamethrin 0.5% w/v and piperonyl butoxide 8.9% w/v) against adult populations of Aedes aegypti in Chennai, Tamil Nadu, India. We bioassayed adult caged mosquitoes, counted indoor resting and human landing adult mosquitoes and assessed the percentage of potential breeding sites with Aedes larvae. The bioassay mortalities indicated that the knockdown and killing effect was greater when fogging was applied inside houses rather than around them. Peridomestic thermal fogging reduced the resting and biting populations by 76% and 40%, respectively for the 3 days after treatment, whereas indoor fogging suppressed adult populations for 5 days.