บทคัดย่องานวิจัย

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Enhanced resistance to side rot in pears treated with calcium chloride during the growing season.

Sugar, D.; Powers, K. A.; Hilton, R. J.;

Plant Disease Year: 1991 Vol: 75 Issue: 2 Pages: 212-214 Ref: 19 ref.

1991

บทคัดย่อ

Enhanced resistance to side rot in pears treated with calcium chloride during the growing season.

Incidence and severity of side rot in Bosc pears were reduced in fruit from trees treated with CaCl2 sprays during the growing season. Trees were treated every 2 weeks beginning in early Jul. for a total of 3 applications of CaCl2 at 0, 1.2, 3.6 or 6.0 g/litre of calcium. Mature fruit were wound-inoculated postharvest with spore suspensions of Phialophora malorum at 0, 10, 102, 103 or 105 spores/ml. Lesion diameter was measured after 3 months of storage at 0 deg C. A significant interaction between rate of CaCl2 and spore concn was observed. At 6.0 g/litre of calcium, the mean area of decay was reduced at spore concn >102/ml. At 3.6 g/litre of calcium, lesion area reduction was significant at 102 and 105 spores/ml. At 1.2 g/litre of calcium, lesion area reduction was significant only at 102 spores/ml. CaCl2 treatment reduced incidence of side rot in naturally infected fruit in 3 yr of trial. CaCl2 did not reduce incidence of decay of pear by Penicillium expansum. Calcium concn in mature fruit pels was related to level of CaCl2 treatment.