Abstract
Six rates of a neem seed extract ranging from 0.1–2.6 mg azadirachtin/g wollen cloth were tested against late instar larvae of the Australian carpet beetle Anthrenocerus australis Hope, the webbing clothes moth Tineola bisselliella Hummel, the case-bearing clothes moth Tinea dubiella Stainton and the brown house moth Hofmannophila pseudospretella Stainton. Feeding damage decreased with increasing rates for all species. A significant rate response was found for T. bisselliella and T. dubiella larval survival after 2 weeks, but there was no effect on A. australis and H. pseudopretella, apart from a rate response in larval moulting in the latter. When the bioassay was repeated using the first instar H. pseudospretella, survival increased with increasing rates of azadirachtin.
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