ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Influence of pre-harvest treatments with calcium on grey mould of table grapes in storage.

Ippolito, A.; Lima, G.; Nigro, F.; Elia, G.; Linsalata, V.; Cascarano, N.;

Difesa delle Piante Year: 1995 Vol: 18 Issue: 1 Pages: 48-55 Ref: 27 ref.

1995

บทคัดย่อ

The results are reported of investigations carried out in Apulia, Italy, to evaluate the effects of calcium chloride (0.5, 1 and 2% sprays) on Botrytis cinerea infection of table grapes, cv. Italia, stored in a cold room at 3 plus or minus 1 deg C or left on the vines under plastic covering for 2 months after the harvest season. The effect of the sprays on the incidence of other rots was also assessed. At harvest time, no appreciable differences between treatments were observed due to the very low incidence of bunch rots. On the grapes stored for 10 d at 3 deg followed by 20 d at 20 deg , B. cinerea, sour rot (caused by variety of microorganisms) and total rots decreased as calcium concn increased. On the grapes left on the plants, the incidence of B. cinerea, sour rot and total rots was significantly reduced compared with the control, even at the lowest CaCl2 concn (0.5%). Berries artificially inoculated with B. cinerea showed a significantly lower percentage infection when sprayed with 1 and 2

% CaCl2, while sprays had no influence on the lesion diam. The epiphytic microbial populations of yeast and filamentous fungi on berries were not clearly influenced by calcium treatments. However, 30 and 40 d after treatments, the yeast populations tended to be a little higher on berries treated with 0.5 and 1% CaCl2, than on control berries and on berries treated with 2% salt. Calcium did not penetrate into the berry skin. None of the treatments was toxic to berries.