Efficacy of Surface Dust Treatments of Pirimiphos-Methyl and Etrimfos when Applied to Commercially Stored Wheat and Barley

✍ Scribed by Collins, Deborah A.; Binns, Terence J.

• Book ID: 102646670
• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 686 KB
• Volume: 47
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(199605)47:1<61::aid-ps393>3.0.co;2-m

✦ Synopsis

Commercially stored wheat and barley were surface treated with dust formulations of pirimiphos-methyl and etrimfos at the manufacturer's recommended application rate. Samples were taken at four-weekly intervals for 32 and 16 weeks for wheat and barley respectively. Pesticide efficacy was determined using insect bioassays and chemical analysis of residues. There was no evidence to suggest a decline in residue levels of either pesticide over the experimental period. However, considerable variation was observed in the residue levels recorded at different sample points and also between residue levels recorded for the same point over the trial period. Control of susceptible strains of Tribolium castaneum (Herbst), Oryzaephilus surinamensis (L.) and Sitophilus granarius (L.) was achieved where recovered pesticide residues remained above 1 mg kg-' pirimiphos-methyl and 1-6 rng kg-' etrimfos.