Quote: I have 2 olive trees, and I get mor then 200 kg every other year, ( olives have two year cycel of production) but the problem here that we have the olive fly, that devastate the yeald, and I dont want to use pesticide, so I have problem.... Mabe I will make olive oil next year, will see!
Benny, we have the olive fly here in California too. It's recommended that you pick up all old olive fruits from the ground, as that is where the flies lay their eggs. Tricky part is, all your neighbors with olive trees have to do the same. Some info here includes safe treatment for certified organic growers - http://www.ipm.ucdavis.edu/PMG/r583301311.html
This is from the UCDavis site:
Cultural Control
Sanitation is important in reducing overall fly densities. Remove old fruit remaining on trees following harvest and destroy all fruit that are on the ground by either burying at least 4 inches deep or taking to the landfill. Extremely high fly populations can occur in fruited varieties of landscape trees and in unmaintained ornamental situations. These can be a significant source for invasion of commercial groves. Prevent fruiting on landscape trees in spring by using a chemical such as naphthaleneacetic acid (NAA; Olive Stop) or destroy fruit on the ground in fall to reduce this invasion pathway. An areawide approach is needed to reduce olive fly densities where commercial plantings are near ornamental or unmaintained trees.
Olive fruit fly adults feed on honeydew. Reducing black scale populations may reduce a food source needed during high summer temperatures.
Organically Acceptable Methods
Cultural controls, the use of GF-120 Naturalyte Fruit Fly Bait (spinosad), sprays of kaolin clay, and mass trapping are acceptable for use in an organically certified crop.
) What kind of chip you used? Hickory? Cherry?
and images!!!! 
