Preliminary results of the effect of plastic covers on the incidence and severity of Pseudomonas syringae pv. actinidiae(Psa) in golden kiwifruit

摘要

This research shows the preliminary results of the use of plastic covers technology in golden kiwifruit as an alternative to contain bacterial canker of kiwifruit caused by Pseudomonas syringae pv. actinidiae (Psa). The experiment was carried out in an orchard of Actinidia chinensis 'Jintao', Psa+, located in the municipality of Sagrada Familia, Region of Maule, Chile, during 2015-2016. The plastic covers used corresponded to a low-density polyethylene of retractable structure and fee time of installation was spring 2015. Evaluations of the level of incidence, severity and damage index (DI) were performed; in addition, the level of blossom necrosis was evaluated. The preliminary results of this research suggest that, 2 months after installation, theplastic covers reduced the expression of the disease at the foliar level, resulting in significant differences between treatments with and without covers in terms of severity and blossom necrosis. The plastic covers did not have an effect on the incidence of the disease in the early stages of its installation. Continuation of this research during the following seasons is critical.