NZPPS   ·  Journal home   ·   Past issues  ·  This volume   ·   Previous abstract   ·   Next abstract

New Zealand Plant Protection 66 (2013): 138-147

Laboratory bioassays of new synthetic and microbial insecticides to control Eucalyptus tortoise beetle Paropsis charybdis

T.M. Withers, M.C. Watson, M.S. Watt, T.L. Nelson, L.A. Harper and M.R.H. Hurst


Paropsis charybdis, or eucalyptus tortoise beetle, is (one of) the most significant pests of eucalypts in New Zealand. It severely defoliates Eucalyptus nitens and Eucalyptus globulus plantations, leaving heavily-damaged trees with reduced growth and poor form. Laboratory bioassays of new synthetic and microbial insecticides were undertaken to identify management options compatible with biological control. The current insecticide used for operational control, alpha-cypermethrin, was a positive control. Of the products tested, spinetoram (Sparta) gave the most promising results (100% mortality after 14 days) for control of adult P. charybdis. Spinetoram and spinosad (Success Naturalyte), the microbial control agents Beauveria bassiana (F305 ex Botanigard) and Bacillus thuringiensis var tenebrionis, and the enterobacterium Yersinia entomophaga, all resulted in high mortality of larval P. charybdis after 4 days. Targeting larvae alone may not be economically viable, leaving spinetoram as the only possible additional insecticide for managing P. charybdis. Potential barriers of cost, application and non-target impacts are yet to be addressed.

Keywords: alpha-cypermethrin, Bacillus thuringiensis, Beauveria bassiana, spinetoram, spinosad, Yersinia entomophaga.

Related articles
pdfSelecting potential non-target species for host range testing of Eadya paropsidis
T.M. Withers, G.R. Allen and C.A.M. Reid (2015)
New Zealand Plant Protection 68: 179-186
pdfA new pest management research facility: Scion's large-scale precision track sprayer
S.F. Gous, T.M. Withers and A.J. Hewitt (2014)
New Zealand Plant Protection 67: 267-273
pdfHybridisation between populations of Enoggera nassaui in New Zealand
T.M. Withers, L.D. Phillips, T.E.M. Bates and R.J. Ganley (2011)
New Zealand Plant Protection 64: 44-48
pdfThe seasonal abundance of the newly established parasitoid complex of the Eucalyptus tortoise beetle (Paropsis charybdis)
D.C. Jones and T.M. Withers (2003)
New Zealand Plant Protection 56: 51-55
pdfParopsis charybdis defoliation of Eucalyptus stands in New Zealand's central North Island
B.D. Murphy and M.K. Kay (2000)
New Zealand Plant Protection 53: 334-338
pdfSusceptibility of life stages of Paropsis charybdis to Beauveria bassiana
B.S. Hastuti, T.R. Glare and R.B. Chapman (1999)
Proceedings of the NZ Plant Protection Conference 52: 98-102
pdfSusceptibility of eucalyptus tortoise beetle (Paropsis charybdis) to Bacillus thuringiensis var. San Diego
T.A. Jackson and G.A. Poinar (1989)
Proceedings of the NZ Weed and Pest Control Conference 42: 140-142

Copyright © 2013 New Zealand Plant Protection Society (Inc.).

Please refer to the terms of use.