- Keep spraying GF-120, or some product with the active ingredient spinosad. If you are not spraying, keep your traps up and refreshed weekly with water and torula yeast.
- Spray every 7-14 days in the interior of the canopy, in the morning, with a 4:1 water to product ratio. Spray up until harvest – there is no pre-harvest interval with GF-120. Reapply more frequently if it rains.
- Unless you have just a few trees, do not bother harvesting already-infected fruit. It will be expensive and time-consuming with very minimal potential results.
- Sort your fruit carefully when harvesting before you arrive at your mill this year. It is difficult to mill extra virgin oil with fruit that has greater than 10% damage. At our discretion, McEvoy Ranch may ask its customers with significant fruit fly damage (>10%) to sign a waiver to this effect this year.
- As much as is reasonable, clean up your orchard post-harvest so as not to leave too much overwintering fruit for the flies.
- In the spring, set your traps out as early as April. At McEvoy Ranch, we made five springtime GF-120 applications in April and May of this year to reduce the population before they could start breeding at pit-hardening.
- Remind your neighbors with olive trees that any untreated trees host the fly and compound the problem for California’s olive producers.