The sublethal effects of a systemic insecticide on the vine mealybug parasitoids anagyrus sp. near pseudococci (girault) and coccidoxenoides perminutus (timberlake) (hymenoptera : encyrtidae)

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Date
2015-12
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South African Society for Enology and Viticulture
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 F 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.
Description
CITATION: Mgocheki, N. & Addison, P. 2015. The sublethal effects of a systemic insecticide on the vine mealybug parasitoids anagyrus sp. near pseudococci (girault) and coccidoxenoides perminutus (timberlake) (hymenoptera : encyrtidae). South African Journal of Enology & Viticulture, 36(1):175-179, doi:10.21548/36-1-950.
The original publication is available at http://www.journals.ac.za/index.php/sajev
Keywords
Imidacloprid, Planococcus ficus, Vineyards, Integrated pest management, Parasitoids
Citation
Mgocheki, N. & Addison, P. 2015. The sublethal effects of a systemic insecticide on the vine mealybug parasitoids anagyrus sp. near pseudococci (girault) and coccidoxenoides perminutus (timberlake) (hymenoptera : encyrtidae). South African Journal of Enology & Viticulture, 36(1):175-179, doi:10.21548/36-1-950
URI
http://hdl.handle.net/10019.1/99826
Collections
Research Articles (Conservation Ecology and Entomology)