Organic control of olive fruit fly in landscapes and small-scale orchards in coastal California
2008
Vossen, P. | Kicenik Devarenne, A.
The olive fruit fly (Bactrocera oleae) (OLF) has recently become the most devastating pest for California's table olive and olive oil industries. Our trials were in Sonoma County, California. Year 1 (2003) focused on the homemade OLIPE trap, comparing attractants (ammonium carbonate and bicarbonate, water, household ammonia, torula yeast, and spiroketal pheromone), and using GF-120 (spinosad bait) as the standard treatment with yellow sticky traps for monitoring. Yeast proved the best bait. Years 2 and 3 compared seven treatments at 28-30 sites with four replications. In 2006 we tested two trap types and two spray treatments at 16 sites with three replications. We tested mass trapping using: an attract and kill device (Magnet OL); McPhail-type traps; OLIPE traps; and yellow sticky traps. We also compared kaolin clay barrier film (Surround) and spinosad bait; and untreated control trees. Yeast was the food bait in all the liquid traps, and ammonium and pheromones on the dry traps. Pheromones with the liquid traps did not help. The McPhail-type traps caught the most flies in all but the year 4. As monitoring devices, none of the traps had catches that correlated well with fruit damage. OLF damage at harvest is shown as an average for (2004/2005/2006): kaolin clay (2.2/2.3/3.1%), spinosad bait (3.9/7.8/11.4%), McPhail (33.5/16.7/3.4%), attract and kill (14.5/41.6%/ na), OLIPE (33.9/30.6/24.6%), yellow sticky traps (30.8/46.0%/na) and untreated control trees (87.6/94.9/35.8%). Sensory evaluation of fly-damaged oils showed that moderate damage can be tolerated as long as the fruit had not rotted.
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