บทคัดย่องานวิจัย

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Control of blue mold of apples by preharvest application of Candida sake grown in media with different water activity.

Teixido, N.; Vinas, I.; Usall, J.; Magan, N.;

Phytopathology Year: 1998 Vol: 88 Issue: 9 Pages: 960-964 Ref: 47 ref.

1998

บทคัดย่อ

Control of blue mold of apples by preharvest application of Candida sake grown in media with different water activity.

Unmodified cells and low water activity (aw)-tolerant cells of C. sake CPA-1 applied before harvest were evaluated for the ability to control blue mold of apples (cv. Golden Delicious) caused by Penicillium expansum under commercial storage conditions. The population dynamics of CPA-1 on apples were studied an orchard in Aitona, Spain and during storage following application of 3x106 colony forming units (CFU)/ml 2 d prior to harvest. In the field, the population size of the unmodified treatment remained relatively unchanged, while the population size of the low-aw-modified CPA-1 cells increased. During cold storage, the populations in both treatments increased from 103 to 105 CFU/g of apple after 30 d and then declined to about 2.5x104 CFU/g of apple. In laboratory studies, the low-aw-tolerant cells provided significantly better disease control as compared with the unmodified cells and reduced the number of infected wounds and lesion size by 75 and 90%, respectively. After 4 months in cold stor

age, both unmodified and low-aw-tolerant cells of C. sake were equally effective against P. expansum on apple (>50% reduction in size of infected wounds).