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H12-P CONTROL OF THE VINE MEALYBUG, PLANOCOCCUS FIC

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					H12-P
CONTROL OF THE VINE MEALYBUG, PLANOCOCCUS FICUS, ON GRAPE IN THE COACHELLA
VALLEY USING PARASITOIDS AND ANT CONTROL

*Kris Tollerup, John Klotz, and Daniel Gonzalez
Department of Entomology, University of California, Riverside, CA 92521

Field releases of the parasitoid, Anagyrus pseudococci (Girault), in conjunction with control the field ant,
Formica perpilosa (Wheeler) significantly reduced the total number of vine mealybugs infesting
grapevines. Experiments were conducted on three vineyards (two Superior Seedless Grape vineyards
and a Thompson Seedless Grape vineyard) during the 2000 - 2001 and 2001 - 2002 growing seasons.
Each ranch had a single experimental block divided into five plots of ca. 0.63 ha each. All plots except
the control plots were treated with Lorsban (chlorpyrifos) to control F. perpilosa and two field-rate
applications of Admire (imidacloprid). Lorsban applications were restricted to a 0.5 m wide strip of soil
directly beneath the grapevines in order to avoid the vine trunk and concentrate the insecticide at the
base of the vines where F. perpilosa nests. Parasitoids were released at 15,000 per week beginning
either 12 weeks prior to harvest (high release rate), for 9 weeks beginning in March to mid May (medium
release rate), or for four weeks beginning in late April (low release rate). Chlorpyrifos provided control of
F. perpilosa for between 3 & 4 weeks. Populations of F. perpilosa rebounded at a critical period just prior
to harvest; additional applications of Lorsban could not be applied due to a 76-day pre-harvest interval.
This trial also focused on developing ant low-toxic baits to replace chlorpyrifos. Bait preference trials
were conducted and indicate that anchovy bait with the active ingredient imidacloprid is highly preferred
by F. perpilosa.

				
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