ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Control of storage rots on various pear cultivars with a saprophytic strain of Pseudomonas syringae.

Janisiewicz, W. J.; Marchi, A.;

Plant Disease Year: 1992 Vol: 76 Issue: 6 Pages: 555-560 Ref: 26 ref.

1992

บทคัดย่อ

Dip treatment of wounded pear fruits (cultivars Anjou [Beurre d'Anjou], Bosc, Bartlett [Williams' Bon Chretien] and Red Bartlett) with a saprophytic strain of P. syringae (L-59-66) provided complete or partial control of grey mould (Botrytis cinerea) and blue mould (Penicillium expansum) during storage at 18 deg C for 5 d or 1 deg for 30 d. Cultivar, wound type and storage temp. significantly affected the efficacy of the treatment. Control of both diseases as high as 100% was achieved in many tests with the addition of L-59-66 to a final concn of 5.4 x 108 c.f.u./ml in the inocula (104 conidia/ml) of the pathogens. Disease control was best on Anjou, where frequently no rot developed, and worst on Bosc, where occasionally >90% of wounds developed disease. Nail wounds, which contained macerated tissue, were more difficult to protect than were clean cuts. Antagonist population in wound sites increased from 6.86 to 9.51 log c.f.u./ml per site during storage of fruit at 1 deg for 30 d. Disease symptoms were not observed at any wound site inoculated with antagonist alone. Larger populations of antagonist were recovered from nail wounds than from cut wounds and from Bosc than from the other cultivars but the antagonist treatment was least effective with Bosc. A higher concn of the antagonist must be used to achieve satisfactory control under these circumstances.