Inhibition of egg development by phosphine in the cosmopolitan pest of stored products Liposcelis bostrychophila (Psocoptera: Liposcelididae)
- 30 July 2003
- journal article
- research article
- Published by Wiley in Pest Management Science
- Vol. 59 (11), 1191-1196
- https://doi.org/10.1002/ps.753
Abstract
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) °C 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. Copyright © 2003 Society of Chemical IndustryKeywords
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