Florida Entomologist (2009) 92, 645-647

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A. O'Reilly and R.G. Van Driesche (2009)
Status of Coccobius nr. fulvus (Hymenoptera: Aphelinidae), a parasitoid of euonymus scale (Hemiptera: Diaspididae), 12-16 years after its release in Massachusetts
Florida Entomologist 92 (4), 645-647
Abstract: Of 3 aphelinids (Coccobius nr. fulvus, Encarsia nr. diaspidicola, and Aphytis sp.) released against euonymus scale (Unaspis euonymi) in Massachusetts in 1991-1994, Coccobius nr fulvus is now established and widespread in urban areas in the Connecticut River Valley. In 2006-2007, it was found at 87% of all sampled sites and average parasitism of adult females was 21%. Encarsia nr diaspidicola, seemingly established in 1991-1994, was not detected in this survey. The formerly dominant E. citrina now parasitizes only 5.6% of scales, down by 58-83% from the 1994 estimates. Estimating the impact of C. nr. fulvus on scale density will require further work.
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Database assignments for author(s): Roy G. Van Driesche

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Unaspis euonymi U.S.A. (NE)
Encarsia citrina (parasitoid) Unaspis euonymi U.S.A. (NE)
Coccobius (genus - parasitoids) Unaspis euonymi U.S.A. (NE)