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Removal of sooty blotch and flyspeck from apple fruit with a chlorine dip.

Hendrix, F. F., Jr.

Plant Disease Year: 1991 Vol: 75 Issue: 7 Pages: 742-743 Ref: 5 ref.

1991

บทคัดย่อ

Removal of sooty blotch and flyspeck from apple fruit with a chlorine dip.

Sooty blotch, caused by Gloeodes pomigena, and flyspeck, caused by Zygophiala jamaicensis [Schizothyrium pomi] were removed from apple fruit with a postharvest chlorine dip. A 5- to 7-min dip in 500 p.p.m. of chlorine in the dump tank of a commercial packing line, followed by brushing and a fresh water rinse, reduced the incidence of sooty blotch from 100 to 0% and flyspeck from 100 to 27%. Apples stored for 3 months after removal of sooty blotch and flyspeck lost only 3.6-4.7% weight. Neither chlorine treatment nor waxing or brushing affected weight loss. Pesticide residues were reduced by the treatment. No phytotoxicity was observed on Red Delicious apple fruit exposed to 4100 p.p.m. of chlorine for 15 min, a level and treatment period far in excess of that required for effectively reducing disease incidence.