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Insecticidal activity of fresh and dry pyrethrum flowers
Author(s) -
Godin P. J.,
Inglis Helene S.,
Stevenson J. H.
Publication year - 1965
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740160403
Subject(s) - pyrethrum , acetone , chemistry , silica gel , gas chromatography , botany , chromatography , horticulture , food science , biology , pesticide , agronomy , organic chemistry
Acetone extracts of fresh pyrethrum flowers and of flowers dried at a low temperature over silica gel were compared by gas‐liquid chromatography and by biological assay. Results showed that there was no effect of drying on the amounts of the known insecticidal constituents and that activity was not diminished. Tests on extracts of pyrethrum flowers dried at various temperatures showed no significant change in composition or activity when flowers were dried at temperatures below 80°, but at 120° there was a significant loss.