Control of blue mould and bitter rot of apples, and brown rot of peaches by Citrus aurantium extract-based product BIOLASTING®

M. Almazán, J.M. Lara, C. Fernández
Reduction of postharvest fruit losses is a major agricultural goal affected by withdrawal of effective chemical products due to environmental or health concerns. Novel clean solutions are necessary. Activity of BIOLASTING®, a new cold pressed citrus extract-based formulation, was tested in vitro and in vivo against Colletotrichum gloeosporioides (bitter rot of apples), Penicillium expansum (blue mould of apples) and Monilinia laxa (brown rot of peaches). BIOLASTING® in vitro reduced the colony diameter of the three pathogens, but reduced spore production only of C. gloeosporioides and M. laxa. In controlled laboratory tests, LSQUOGolden DeliciousRSQUO apples were wound-inoculated with a spore suspension of P. expansum or C. gloeosporioides, while LSQUOAmarillo TardíoRSQUO peaches were inoculated with spore solution of M. laxa. Two hours after inoculation with the corresponding pathogen, fruit were treated by immersion in the product solution for 2 min. Lesions diameter was measured at 26, 28 or 31 days after application according to the pathogen. In the C. gloeosporioides tests, quality parameters also were assessed (firmness, soluble solid content and titratable acidity). BIOLASTING® was also tested at semi-commercial conditions against M. laxa on peaches. The product was applied by drench or spray at two doses (1 and 1.5%). In the apples tests, BIOLASTING® applied at 1% reduced by 78% the area infected by C. gloeosporioides and improved all the assessed quality parameters, but was unable to control P. expansum at any doses. In peach laboratory tests, BIOLASTING® at 2 and 3% reduced M. laxa severity by 52 and 71%, respectively. Under semi-commercial conditions, BIOLASTING® exhibited more than 90% reduction of rot surface without significant differences between doses or type of application. The incidence was also reduced with better results (93%) at the 1.5% dose applied as drench. Based on these results, it can be concluded that postharvest applications of BIOLASTING® might significantly reduce bitter rot on apples and brown rot on peaches.
Almazán, M., Lara, J.M. and Fernández, C. (2016). Control of blue mould and bitter rot of apples, and brown rot of peaches by Citrus aurantium extract-based product BIOLASTING®. Acta Hortic. 1144, 409-416
DOI: 10.17660/ActaHortic.2016.1144.61
Colletotrichum gloeosporioides, Penicillium expansum, Monilinia laxa, cold pressed citrus extract, postharvest diseases

Acta Horticulturae