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Effects of Mowing or Spraying Carduus thoermeri on Rhinocyllus conicus

  • Philip W. Tipping (a1)


In 1988, mowing C. thoermeri once at the bud stage, twice at the bud stage, or once at early bloom of the primary inflorescences, eliminated emergence of Rhinocyllus conicus, a weevil introduced as a biological control agent. Mowing at full bloom reduced weevil survival by 78.8%, whereas mowing at senescence had no effect. In 1989, mowing at full bloom or senescence did not affect weevil survival. Dicamba applied at the full bloom or senescence stage did not affect R. conicus survival, whereas hexazinone reduced R. conicus survival when applied at all growth stages.



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1. Harris, P. 1984. Carduus nutans L., nodding thistle and C. acanthoides L., plumeless thistle (Compositae). p. 115126 in Kelleher, J. S. and Hulme, M. A., eds. Biological Control Programmes Against Insects and Weeds in Canada 1969–1980. Commonwealth Agricultural Bureaux, London.
2. Hodgson, J. M., and Rees, N. E. 1976. Dispersal of Rhinocyllus conicus for biocontrol of musk thistle. Weed Sci. 24:5962.
3. Julien, M. H. 1987. Biological Control of Weeds: A World Catalogue of Agents and Their Target Weeds, 2nd ed. CAB International, Wallingford, UK.
4. McCarty, M. K. 1982. Musk thistle (Carduus thoermeri) seed production. Weed Sci. 30:441445.
5. McCarty, M. K., and Hatting, J. L. 1975. Effects of herbicides or mowing on musk thistle seed production. Weed Res. 15:363367.
6. Rees, N. E. 1977. Impact of Rhinocyllus conicus on thistles in Southwestern Montana. Environ. Entomol. 6:839842.
7. Surles, W. W., Kok, L. T., and Pienkowski, R. L. 1974. Rhinocyllus conicus establishment for biocontrol of thistles in Virginia. Weed Sci. 22:13.
8. Tipping, P. W., and Hight, S. D. 1989. Status of Rhinocyllus conicus (Coleoptera: Curculionidae) in Maryland. Md. Entomol. 3:123128.
9. Trumble, J. T., and Kok, L. T. 1979. Compatibility of Rhinocyllus conicus Froelich and 2,4-D (LVA) for musk thistle control. Environ. Entomol. 8:421422.


Effects of Mowing or Spraying Carduus thoermeri on Rhinocyllus conicus

  • Philip W. Tipping (a1)


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