บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Pilot testing of Pichia guilliermondii: a biocontrol agent of postharvest diseases of citrus fruit.

Droby, S.; Hofstein, R.; Wilson, C. L.; Wisniewski, M.; Fridlender, B.; Cohen, L.; Weiss, B.; Daus, A.; Timar, D.; Chalutz, E.;

Biological Control Year: 1993 Vol: 3 Issue: 1 Pages: 47-52 Ref: 17 ref.

1993

บทคัดย่อ

Pilot testing of Pichia guilliermondii: a biocontrol agent of postharvest diseases of citrus fruit.

The efficacy of the yeast P. guilliermondii (US-7) in controlling postharvest decay (caused by Penicillium digitatum, Penicillium italicum and other fungi) of citrus fruit was evaluated in small-scale and pilot tests in commercial packinghouses. In scale-up fermentation on cheap industrial waste materials, P. guilliermondii grew efficiently and maintained its antagonistic activity, as tested in an in vitro assay against spore germination of P. digitatum. In small-scale experiments with injured and non-injured fruits dipped in the yeast cell suspension, the development of decay in several citrus cultivars was effectively inhibited. The yeast was compatible with a mixture of commonly used waxes containing a low concn of a chemical fungicide. In packinghouse tests, combining the yeast with 200 p.p.m. thiabendazole resulted in a reduction in the incidence of decay to a level equal to that of the commercial treatment of 2000 p.p.m. thiabendazole. The efficacy of US-7 could also be maintained under packinghouse conditions at a cell concn of the yeast antagonist as low as 107 cells/ml. No significant difference in the efficacy of P. guilliermondii was found in either the drench or the spray application systems tested in citrus packing-houses.