IL Fiorello Olive Oil Co sponsored a growers meeting on Saturday June 28, 2105 we were joined by Marvin Martin, of MarvinMartin Olive Oils and a professional olive grower and master taster from Napa and Tom Turpen, Plant Biologist, from Davis, CA.
The days discussion centered about olive fly in California and in Italy. We reviewed the methods available to growers to use GF 120 or Spinocid. Most of the growers were aware of the application process and the dilution ratio of 1 to 1.5 or 1 to 2. When mixed the Spinocid must be used within 24 according to the Dow Chemical product information. Discussion centered about how problems arise with the olive fly when neighboring growers do not spray their trees. An example is of ornamental trees planted in neighborhoods or city plantings. Suggestions were made to contact neighbors and do cooperative spraying, and to discuss with city officials that city trees need to be fruitless or sprayed to preserve commercial or private crops. There is a spray that can be applied to prevent fruit set. Swan variety of olives is also fruitless.
Discussion also centered on the use of Kaolin clay. One of our growers has been using it on tomatoes with good success. Application is at least 3 times a season to protect the olives. In California, this does not seem to be a problem, but if it rains reapplication is necessary. The manufacturer reports that this product does not have an effect on photosynthesis. No one at the meeting has direct experience with the residual Kaolin wash water risk at the mill. We at IL Fiorello are trying to find more information about how this residual is handled at the olive washing site. Short of washing the olives on site by the grower we are concerned about the residual clay in the water at the mill.
Chef Martin was a guest at Expolivo in Spain and reported to the meeting some of his findings and experiences. Expolivo is the world’s largest olive oil convention. Reports and books from the Expolivo meeting are available for your perusal at IL Fiorello, courtesy of Chef Marvin.
Tom Turpen, from Innovationmatters.com, discussed Xylella infestation in the citrus greening disease and the concern for like diseases in olives. Please refer to the article Olive Quick Decline in Italy Associated with Xylella Fastidiosa, by Elizabeth Fichtner, Dani Lightle, and Rodrigo Krugner, published in California Fresh Fruit, June 2015. OQDS, (olive quick decline syndrome) is destroying trees in Southern Italy. It is of concern here in California and growers should report dieback or scorch on olives to farm advisors or agricultural commissioners. He also discussed the possibility of research to control olive fly propagation. The group consensus was positive to go forward with this discussion and research.
The growers meeting concluded with a tour of IL Fiorello Olive Mill and a discussion of the plan for milling this coming year. Clear communication between growers and millers can make the difference call us with questions.
Marvin Martin marvinmartinoliveoils.com for information and olive grove management
UC Davis IPM Integrated Pest Management
Dr. Frank Zalom Professor of Entomology UC Davis
Dow Chemical: Spinocid information
Novasource: Surround WP Crop Protectant OMRI Organic for the Kaolin Clay