ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Postharvest control of blue mold and gray mold of apples and pears by dip treatment with pyrrolnitrin, a metabolite of Pseudomonas cepacia.

Janisiewicz, W.; Yourman, L.; Roitman, J.; Mahoney, N.;

Plant Disease Year: 1991 Vol: 75 Issue: 5 Pages: 490-494 Ref: 27 ref.

1991

บทคัดย่อ

The antifungal compound pyrrolnitrin, isolated from P. cepacia, an antagonist known to control grey mould (incited by Botrytis cinerea) and blue mould (incited by Penicillium expansum) of apples and pears, was assayed for its efficacy in controlling these diseases on wounded fruit at 2 temp. (2 and 24 deg C). The compound was applied to wounded fruit after harvest at concn ranging from 6 to 200 micro g/ml in dip solutions containing conidia of P. expansum or B. cinerea (1 x 104 conidia/ml). Pyrrolnitrin provided effective control of both diseases on apples and pears. The type of wound had a profound effect on control; infections at cut wounds were the easiest and those at bruise wounds were the most difficult to control. Higher concn of pyrrolnitrin were required for control at 24 deg than at 2 deg . Pyrrolnitrin at 200 micro g/ml, when applied up to 34 h after inoculation, eradicated infections by both pathogens on Golden Delicious apples with cut wounds. The pH of the pyrrolnitrin solution, throughout a range corresponding to the pH of the fruit juice, did not change its fungicidal activity in in vitro tests.