The Sublethal Effects of a Systemic Insecticide on the Vine Mealybug Parasitoids Anagyrus sp. near pseudococci (Girault) and Coccidoxenoides perminutus (Timberlake) (Hymenoptera: Encyrtidae)

  • N. Mgocheki Department of Conservation Ecology and Entomology, Faculty of AgriSciences, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa. Crop Science Department, Faculty of Agriculture and Environmental Sciences, Bindura University of Science Education, P/Bag 1020, Bindura, Zimbabwe. E-mail address: nmogocheki@yahoo.com.
  • P. Addison Department of Conservation Ecology and Entomology, Faculty of AgriSciences, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
DOI: https://doi.org/10.21548/36-1-950

Abstract

Imidacloprid is a systemic insecticide used for the control of the vine mealybug Planococcus ficus.
However, biological control of P. ficus is the primary alternate management method recommended for the
integrated control of this pest. We therefore aimed to establish the detrimental effects on the development
of Anagyrus. sp. near pseudococci and Coccidoxenoides perminutus feeding on imidacloprid-contaminated
vine mealybugs as indicated by the subsequent emergence and survival of the F1 generation. The results
imply that A. sp. near pseudococci and C. perminutus were equally susceptible to imidacloprid, based on
probit analysis. However, survival was significantly different between the control and insecticide treatment
for C. perminutus (χ2 = 23.80; d.f. = 3; p < 0.001), but not for A. sp. near pseudococci (χ2 = 5.07; d.f. = 3; p
= 0.17). As this study was laboratory based, the effect of imidacloprid on populations of parasitoids in the
field should be assessed further. Treatment recommendations to minimise the impact on parasitoids are
discussed briefly.

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Published
2016-09-12
Issue
Vol. 36 No. 1 (2015)
Section
Articles

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