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A DIRECT‐SPRAY TECHNIQUE FOR THE BIOLOGICAL EVALUATION OF PYRETHRUM‐IN‐OIL INSECTICIDES FOR USE AGAINST STORED PRODUCT INSECTS IN WAREHOUSES
Author(s) -
HEWLETT P. S.
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.tb06370.x
Subject(s) - pyrethrum , biology , warehouse , toxicology , product (mathematics) , microbiology and biotechnology , pesticide , agronomy , mathematics , geometry , marketing , business
A direct‐spray technique for the biological assay of pyrethrins in Shell oil P31 is described, together with the experiments leading to its adoption. The technique is such that film effects are reduced to the minimum practicable, but it is otherwise as similar as possible to the film technique described by Parkin & Green (1943). Methods for statistical analysis of the results are discussed. For the biological assay of pyrethrins in Shell oil P31, the direct‐spray method is slightly superior to Parkin & Green's film method, but both techniques should have their uses in general experimental work.