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THE FORMATION OF INSECTICIDAL FILMS ON BUILDING MATERIALS: II. TESTS OF THE EFFICIENCY OF VARIOUS TYPES OF PRETREATMENT
Author(s) -
HEWLETT P. S.,
PARKIN E. A.
Publication year - 1947
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1947.tb06357.x
Subject(s) - pyrethrum , cement , brick , biology , pulp and paper industry , toxicology , materials science , gelatin , pesticide , composite material , agronomy , biochemistry , engineering
Thirty different pretreatments have been tested, in addition to those mentioned in a previous contribution, for their efficiency in prolonging the effective toxic life of a film of pyrethrins in Shell Oil P 31 deposited on brick. Reasons for the success or failure of the various types of pretreatment are considered. Seven substances selected for further trial were tested on four more building materials—limewashed brick, wood, cement, and cement‐sand mixture. The five pretreatments which gave good results on all or most of these substrates were then tested to determine how long they would continue to support a toxic film on cement. Solutions of size and gelatin caused the greatest persistence of toxicity of the pyrethrum films. The flour beetle, Tribolium castaneum Herbst, was used throughout as the test insect.