Journal
PEST MANAGEMENT SCIENCE
Volume 59, Issue 11, Pages 1191-1196Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/ps.753
Keywords
Liposcelis bostiychophila; Psocoptera; phosphine; delayed hatching; eggs; stored products; resistance
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Phosphine-induced delay in development of eggs was investigated as a mechanism of resistance to this fumigant in Liposcelis bostrychophila Badonnel. One-day-old eggs of a susceptible and a strongly resistant strain of L bostrychophila were exposed to a range of phosphine concentrations for 6 days at 30 (+/-1)degreesC and 70 (+/-2)% RH. Delay in mean hatching period occurred in both susceptible and resistant eggs, although it was more pronounced in the latter. A maximum delay of 2.65 days was recorded for eggs of the susceptible strain at 0.01 mg litre(-1) (the highest concentration at which eggs survived) and 13.39 days for the resistant strain at 1 mg litre(-1) (the highest concentration tested). Delay in egg development time was positively correlated with increasing phosphine concentration. Our results reveal that the most successful strategy to control resistant L bostrychophila is to apply relatively low concentrations of phosphine for extended exposure times (eg 0.05 mg litre(-1) for 16 days) that allow all eggs to hatch to the much less tolerant nymph stage. (C) 2003 Society of Chemical Industry.
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