The action of phosphine against the eggs of phosphine-resistant and -susceptible strains of Rhyzopertha dominica F

Rajendran, S. and Kirti, R. Nayak and Anjum, S. S. (2001) The action of phosphine against the eggs of phosphine-resistant and -susceptible strains of Rhyzopertha dominica F. Pest Management Science, 57. pp. 422-426.

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Abstract

The effect of phosphine at exposure periods of 24, 48 and 120 h on hatching and mortality of 0- to 1-day-old eggs of susceptible (TN6) and resistant (FC10) strains of Rhyzopertha dominica of field origin was investigated. The fumigant affected hatching in both the strains. In a 48-h exposure at 27 (± 2) °C, the LD99 doses for the eggs of TN6 and FC10 were 0.56 and 3.25 mg litre-1, respectively. Significant reduction in hatching was observed in treated batches with progressive increase of phosphine dose in the first 2-3 days. On subsequent days the numbers hatching were often similar to those in controls, and sometimes exceeded control hatch, especially following a 5-day exposure. A critical change in the order of susceptibility of egg and adult stages of the two strains was noticed. In 48-h exposures, eggs of the susceptible strain were more tolerant than their adults, whilst the reverse was true in the resistant strain.

Item Type:	Article
Uncontrolled Keywords:	phosphine Rhyzopertha dominica egg hatch mortality
Subjects:	600 Technology > 03 Agriculture > 05 Insect/Pest Control
Divisions:	Food Protectants and Infestation Control
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	24 Sep 2007 09:17
Last Modified:	16 May 2012 09:22
URI:	http://ir.cftri.res.in/id/eprint/1415

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