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Biomedical subjects

A B HADAWAY

Publications and source records attributed to A B HADAWAY.

At least 19 recordsLinked to original sources
PubMed1963

The toxicity of some organophosphorus compounds to adult Anopheles stephensi.

The authors have evaluated a number of organophosphorus compounds for residual contact toxicity to adult Anopheles stephensi. Fenthion and malathion were the most promising of the compounds, and wettable powder deposits at a dosage of 1 g/m(2) on plywood remained effective for five months. There was, however, a rapid loss of effectiveness on dried mud bricks stored at 25 degrees C and 50%-55% relative humidity.Diazinon and ronnel were less persistent on plywood. Guthion and coumaphos, although highly toxic by topical application, were both ineffective as contact insecticides when applied as solids in suspension. Trithion and methyl trithion were relatively low in toxicity both by topical application and as contact insecticides.

Animals↗
PubMed1963

THE TOXICITY OF CARBAMATES TO ADULT ANOPHELES STEPHENSI.

Experiments to evaluate the residual contact toxicity of five carbamates to adult Anopheles stephensi have shown that four of the compounds (Hercules 7522, UC 10854, Bayer 39007 and RE-5305) were effective as contact insecticides for at least three months when applied as wettable powders on plywood at a dosage of 1 g/m(2). They were rapidly sorbed, however, on dried mud bricks stored at 25 degrees C and 50%-55% relative humidity, and were unstable on fresh limewash. The authors conclude that, although these compounds show promise as residual insecticides, their residual properties may be expected to vary according to the properties of the building materials to which they are applied. A fifth carbamate, Sevin, was much less effective as a contact insecticide.

Animals↗
PubMed1963

THE RESIDUAL ACTION OF TWO ORGANOPHOSPHORUS COMPOUNDS AND A CARBAMATE ON DRIED MUDS.

Laboratory experiments have shown that the sorption of two organophosphorus compounds, malathion and fenthion, and a carbamate, UC 10854, on dried muds is influenced by atmospheric humidity and that the biological activity of a given concentration of sorbed insecticide increases with increasing humidity. The residual action of these insecticides on dried mud bricks stored in the laboratory at 25 degrees C and 80% relative humidity was similar to that obtained in experimental huts at Arusha, Tanganyika.The laboratory bio-assays indicate that both fenthion and UC 10854 can be expected to have several weeks' residual action on dried mud walls provided that the atmospheric humidity is high enough. Malathion was much less effective in the test conditions described in this paper, but field data suggest that it has a long residual action on grass roofs.

Animals↗