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

摘要

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)deg 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 2.0-7.0mglitre~(-1)doses for 48h(5-80%mortality)and with 1.0-2.0mglitre~(-1)for 120h(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.