Archives of Virology (2015) 160, 2407-2413

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Steven M. Valles and Sanford D. Porter (2015)
Dose response of red imported fire ant colonies to Solenopsis invicta virus 3
Archives of Virology 160 (10), 2407-2413
Abstract: Baiting tests were conducted to evaluate the effect of increasing Solenopsis invicta virus 3 (SINV-3) dose on fire ant colonies. Actively growing early-stage fire ant (Solenopsis invicta Buren) laboratory colonies were pulse-exposed for 24 hours to six concentrations of SINV-3 (101, 103, 105, 107, 109 genome equivalents/μl) in 1 ml of a 10 % sucrose bait and monitored regularly for two months. SINV-3 concentration had a significant effect on colony health. Brood rating (proportion of brood to worker ants) began to depart from the control group at 19 days for the 109 concentration and 26 days for the 107 concentration.At 60 days, brood rating was significantly lower among colonies treated with 109, 107, and 105 SINV-3 concentrations. The intermediate concentration, 105, appeared to cause a chronic, low-level infection with one colony (n = 9)supporting virus replication. Newly synthesized virus was not detected in any fire ant colonies treated at the 101 concentration, indicating that active infections failed to be established at this level of exposure. The highest bait concentration chosen, 109, appeared most effective from a control aspect; mean colony brood rating at this concentration (1.1 ± 0.9 at the 60 day time point) indicated poor colony health with minimal brood production. No clear relationship was observed between the quantity of plus genome strand detected and brood rating. Conversely, there was a strong relationship between the presence of the replicative genome strand and declining brood rating, which may serve as a predictor of disease severity. Recommendations for field treatment levels to control fire ants with SINV-3 are discussed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Steven M. Valles, Sanford D. Porter

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

Pest and/or beneficial records:

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

Solenopsis invicta U.S.A. (SE)
Solenopsis invicta virus 3 (entomopathogen) Solenopsis invicta U.S.A. (SE)