McNeill et al 2014_NZPP_ pesticide toxicity.pdf (401.78 kB)

Toxicity of selected agrichemicals to clover root weevil and its parasitoid Microctonus aethiopoides

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journal contribution
posted on 2023-05-03, 12:09 authored by Mark McNeillMark McNeill, Tina Eden, Vanessa Cave
White clover (Trifolium repens) crops are attacked by various insect pests including Sitona obsoletus (=S. lepidus) (CRW). Laboratory experiments were conducted to measure the toxicity of eight agrichemicals used against white clover insect pests or for weed control on CRW (parasitised and non-parasitised) and adults of its parasitoid Microctonus aethiopoides. Laboratory experiments evaluated insect toxicity through direct contact with the agrichemical spray or via exposure to residues on clover foliage. At field rates, pymetrozine had the lowest impact on CRW biocontrol but had poor activity against non-parasitized CRW. Taufluvalinate provided 60% control of CRW, while having reduced impact on M. aethiopoides adults (0-60% mortality), and was considered the best option in the field over the summer period. Lambda-cyhalothrin and diazinon were the most detrimental to CRW and its biocontrol agent when applied directly and through exposure to residues. Diquat and an adjuvant caused some mortality to CRW and parasitoid. Field studies are needed to corroborate these results.


Rights statement

© 2014 New Zealand Plant Protection Society (Inc.)


  • English

Does this contain Māori information or data?

  • No


New Zealand Plant Protection Society (Inc)

Journal title

New Zealand Plant Protection


McNeill, M.R., Eden, T.M., & Cave, V.M. (2014). Toxicity of selected agrichemicals to clover root weevil. New Zealand Plant Protection, 67, 256-266