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V.A. Bourbos and E.A. Barbopoulou NAGREF, Institute of Olive Tree and Subtropical Plants of Chania, Lab. of Plant Pathology and Ecotoxicology of Plant Protection Products, Agrokipio, 73100 Chania, Crete, Greece
Protein harpin Ea considered today as an effective stimulator of self-defense system as well as of other physiological mechanisms in many plant species. This work studies the effect of harpin Ea in fruit production as well as in the possibility to control Phytophthora infestans, a serious pathogen for open-field and greenhouse tomato cultivation. Harpin Ea was applied at a dose of 50,6 g/hl of the commercial product Messenger®. In order to study the possibility to control tomato late blight with harpin Ea, the fungicide fosetyl-Al was chosen as reference product at a dose of 200 g/hl of the commercial product Aliette 80 WP. Daily growth, number of flowers and fruits per cluster, fruit set percentage and total yield per plant were measured in order to estimate the effect on production. Estimation of the effectiveness to control the pathogen was based on the measurement of leaf spots and stem lesions. In the conditions of the experiment harpin Ea increased fruit set percentage at 6,92-7,73% and yield at 47,83-50,33% as well as it restricted pathogen with an effectiveness that ranged 98,83-100% in respect to the control.