title: Field trial of the effectiveness of indoor-spraying with pirimiphos-methyl emulsion for malaria control in a tribal area of Phulbani district, Orissa State, India.
abstract: A field trial of malaria vector control was conducted in Phulbani district, Orissa, during 1984 and 1985. Indoor-spraying of pirimiphos-methyl emulsion formulation was undertaken at an application rate of 2 g/m2 in two sections (population 14,692) of Nuagaon Primary Health Centre. Houses in two adjacent sections (population 21,450) were sprayed with DDT a water dispersible powder (wdp) formulation at 1 g/m2 for comparison purposes. Operational problems in this area come from the tendency of tribal people to re-plaster over wdp applications. Pre-spray malariological indices in the trial area were 38% slide positivity rate, 37% slide falciparum rate and 12.1% annual parasite incidence. Densities of Anopheles annularis Van der Wulp, An. culicifacies Giles, An. fluviatilis Theobald and other potential malaria vectors were reduced in the pirimiphos-methyl trial area 2-35-fold more than in the area sprayed with DDT. Malariological indices were reduced by 65-68% in the pirimiphos-methyl sprayed area compared with only 26-35% reduction in the DDT sprayed area. Spraymen and villagers experienced no adverse side-effects from residual house-spraying with pirimiphos-methyl emulsion and it is concluded that this organophosphate product has advantages for malaria vector control, especially in operationally difficult situations.
authors.affiliation: National Malaria Eradication Programme, Delhi, India.
authors.forename: M
authors.initials: M
authors.lastname: Das
authors.forename: B N
authors.initials: BN
authors.lastname: Srivastava
authors.forename: C K
authors.initials: CK
authors.lastname: Rao
authors.forename: B R
authors.initials: BR
authors.lastname: Thapar
authors.forename: G K
authors.initials: GK
authors.lastname: Sharma
mesh_terms: D000336:Aerosols; D000818:Animals; D000852:Anopheles; D006798:Housing; D007194:India; D007306:Insecticides; D008288:Malaria / Q000517:prevention & control*; D009032:Mosquito Control / Q000379:methods*; D009946:Organothiophosphorus Compounds
chemical_list: D000336:Aerosols; D007306:Insecticides; D009946:Organothiophosphorus Compounds; C014153:pirimiphos methyl