Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9474850 | Journal of Stored Products Research | 2005 | 13 Pages |
Abstract
Mixed-age cultures, containing all life stages, of a highly resistant strain (Strong-R) of lesser grain borer, Rhyzopertha dominica (F.), were exposed to a series of fixed concentrations of phosphine at a range of exposure periods at 25 °C. A susceptible strain and a less-resistant strain (Weak-R) were also tested. The aim was to characterise the resistant strain and determine if it could be controlled with phosphine. Times to population extinction (TPE) were recorded and lethal time (LT99.9) values calculated. The relationship between exposure period t and phosphine concentration C for the resistant strains were: for Strong-R LT99.9C0.5457t=3.852 and TPE C0.6105t=4.0404 and for Weak-R LT99.9C0.3553t=3.6521 and TPE C0.4507t=3.4833. The results were used to define a range of minimum exposure period Ãconcentration protocols for control of the Strong-R populations. For example, at 1.0, 0.3, and 0.2 mg lâ1 complete control can be expected in 5, 10 and 14 days, respectively. This information will be used to recommend phosphine rates for field trial and eventual registration.
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Authors
Patrick J. Collins, Gregory J. Daglish, Hervoika Pavic, Rosemary A. Kopittke,