Influence of phosphine on hatching of Cryptolestes ferrugineus (Coleoptera: Cucujidae), Lasioderma serricorne (Coleoptera: Anobiidae) and Oryzaephilus surinamensis (Coleoptera: Silvanidae)

Abstract

The hatching and mortality response of 0‐ to 48‐h‐old eggs of field strains of the stored‐product insects Cryptolestes ferrugineus (Stephens), Lasioderma serricorne (F) and Oryzaephilus surinamensis (L) following phosphine fumigation for 24, 48 or 120 h at 27 (±2) °C was investigated. Hatching was delayed and reduced in the first few days in a phosphine‐resistant strain of C ferrugineus that was treated with 2.0–7.0 mg litre⁻¹ doses for 48 h (5–80% mortality) and with 1.0–2.0 mg litre⁻¹ for 120 h (44–84% mortality). In both the exposures there were significant increases in hatching on later days when compared with the corresponding controls. Developmental delay was, however, not evident in susceptible strains of C ferrugineus, L serricorne and O surinamensis that were exposed to phosphine for 24 h. Copyright © 2004 Society of Chemical Industry