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A note on the efficiency of a pyrethrum spray in controlling Ephestia elutella Hb. moths in a granary
Author(s) -
Owen R. W.
Publication year - 1946
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.1744-7348.1946.tb06328.x
Subject(s) - biology , pyrethrum , granary , horticulture , population , toxicology , botany , stowage , agronomy , pesticide , archaeology , demography , structural engineering , sociology , history , engineering
A stowage in a London granary containing 500 tons of Manitoba wheat was sprayed with 0.8 % w/v pyrethrins in Shell oil P31, in an attempt to control an Ephestia elutella infestation. The mean deposit on the surface of the wheat was 1‐5 mg./sq.cm., of which one‐sixth was due to the settling of mist. All the moths in the stowage at the time of spraying, estimated at 68,900, were killed or fatally affected within 24 hr., and those which emerged later, estimated at 7500, were killed by the insecticidal film. The spray was not observed to have any marked effect on the size of the migrating larval population.