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Sublethal plant defences, resulting in impaired growth of insect herbivores, may increase the impact of natural enemies upon those herbivores. This study examined whether such effects could be reproduced by chemically altering host growth rates. Fresh residues of piperonyl butoxide (a compound which slows growth in nymphs of the whitefly, Bemisia tabaci (Gennadius)) showed relatively little toxicity...
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