Improvement of biocontrol activity of Pantoea agglomerans CPA-2 to control postharvest diseases in citrus by preharvest applications
N. Teixido, T. P. Cañamás, R. Torres, M . Anguera, J. Usall and I. Viñas.
Journal of Plant Pathology Volume 90 (2, Supplement) August 2008, Book of Abstract, 9th International Congress of Plant Pathology, August 24-29, 2008 Torino,Italy,. 507 pages.
2008
บทคัดย่อ
Improvement of biocontrol activity of Pantoea agglomerans CPA-2 to control postharvest diseases in citrus by preharvest applications
Postharvest pathogens such asPenicillium digitatumoften occurin the field prior to harvest. It would be better to apply biocontrol agents before harvest, to reduce initial infection and then maintain active control of pathogens in storage and/or commercial conditions, but biological control in the field is usually limited by fluctuating environment and by the narrow range of environmental conditions. The main goal of this research was to determine the influence of different formulation strategies on the survival and efficacy ofPantoea agglomeranscells under field conditions, including lyophilised cells, osmotic adaptation ofP. agglomeransby NaCl treatments, and additives. Different additives, such as summer oils, alginate, glycerol and food additives were tested mixed withP. agglomeransin laboratory studies. The additive providing the highest bacterial viability on oranges was the food film Fungicover (FC) at 50 g/l. In general, osmotically adapted and lyophilisedP. agglomeranscells survived better than non-adapted or fresh cells when sprayed in field conditions. However, this superiority was only found when Fungicover was also added to the suspensions. These results show that it is possible to improve environmental stress tolerance and ecological competence ofP. agglomeranscells using certain formulation strategies.