ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Control of green mold of lemons with Pseudomonas species.

Smilanick, J. L.; Denis-Arrue, R.;

Plant Disease Year: 1992 Vol: 76 Issue: 5 Pages: 481-485 Ref: 47 ref.

1992

บทคัดย่อ

Applications of P. cepacia reduced postharvest green mould (Penicillium digitatum) by >80% in lemon fruit compared with controls. The bacterium grew rapidly in wounds and caused no visible injury to the fruit. Decay was controlled if P. cepacia was applied within 12 h after pathogen inoculation. The fungicides imazalil and thiabendazole were better eradicants; they were effective when applied up to 24 h after inoculation. Other pseudomonads were not as effective as P. cepacia. Inhibition of fungal growth in vitro by P. cepacia is reportedly caused by the antibiotic pyrrolnitrin. Spores of P. digitatum did not germinate in potato-dextrose broth amended with 0.1 micro g/ml pyrrolnitrin. However, decay caused by pyrrolnitrin-tolerant mutants of P. digitatum, which germinate in pyrrolnitrin at 60 micro g/ml, was controlled by P. cepacia. Washed, viable cells of P. cepacia and P. corrugata reduced decay whereas cell-free culture fluids did not. P. fluorescens did not inhibit P. digitatum growth in vitro yet it reduced decay by c. 70%. It is concluded that antibiotics may not comprise the entire mode of action of pseudomonads on citrus.