*Article* **Testing the Single and Combined Effect of Kaolin and Spinosad against** *Bactrocera oleae* **and Its Natural Antagonist Insects in an Organic Olive Grove**

**Veronica Vizzarri, Luca Lombardo \*, Carmine Novellis, Pierluigi Rizzo, Massimiliano Pellegrino, Giuseppe Cruceli, Gianluca Godino, Francesco Zaffina and Annamaria Ienco**

> CREA Research Centre for Olive, Citrus and Tree Fruit, 87036 Rende, Italy **\*** Correspondence: luca.lombardo@crea.gov.it

**Abstract:** The presence and infestation level of *Bactrocera oleae* was monitored in an organic olive orchard divided into differently treated parcels with kaolin (K), spinosad (S) and with kaolin and spinosad (K + S) in alternate rows. The treatments did not seem to affect olive fruit fly population dynamics, while statistically significant protective effects were recorded against total and harmful infestation, but not against the active one. Eventually, neither kaolin nor spinosad were shown to have a particular detrimental effect against naturally occurring *B. oleae* parasitoids.

**Keywords:** *Bactrocera oleae*; spinosad; kaolin; organic oliviculture
