Olive (Olea europaea L.) is one of the most important crops in the Mediterranean countries. Olive leaves, available throughout the year, are one of the byproducts of olive farming; they accumulate during the pruning of the olive trees and can be found in large amounts in olive oil industries after being separated from fruits before processing (about 10% of the weight of olives). Several reports have shown that olive leaves have antioxidant activity and anti-fungal properties, So, can be used dry leaves powder as protectants against phytopathogenic.