ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Prevention of black spot disease in persimmon fruit by gibberellic acid and iprodione treatments.

Perez, A.; Ben-Arie, R.; Dinoor, A.; Genizi, A.; Prusky, D.;

Phytopathology Year: 1995 Vol: 85 Issue: 2 Pages: 221-225 Ref: 11 ref.

1995

บทคัดย่อ

Three treatments with gibberellic acid (GA3, 20 micro g/ml) applied during fruit development at 30, 20 and 10 d before harvest, reduced decay due to black spot disease (BSD) (caused by Alternaria alternata) in persimmon fruit more effectively than the single commercial treatment of GA3 (50 micro g/ml) applied 10 d before harvest. As a result of GA3 treatment, the calyx of the fruit remained erect until harvest. The correlation coeff. between BSD under the calyx and calyx erectness was r=-0.72. Persimmon fruits treated with GA3 in the orchard and stored at 0 deg C for 3 months showed less fruit area becoming covered with black spot during storage compared with untreated fruit. Increasing the number of sprays from 1 to 3 resulted in a decreased infected area. Sprays of GA3 also inhibited fruit softening, with a correlation coeff. of r=-0.63 between decayed area and fruit firmness. GA3 at concn up to 200 micro g/ml had no effect on fungal development in vitro and in vivo on inoculated fruits. GA3 a

pparently affects decay development by enhancing resistance of the fruit. Preharvest treatment with GA3 and iprodione further reduced the percentage of fruits unmarketable due to BSD.