ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effect of inoculum concentration and salt solutions on biological control of postharvest diseases of apple with Candida sp.

McLaughlin, R. J.; Wisniewski, M. E.; Wilson, C. L.; Chalutz, E.;

Phytopathology Year: 1990 Vol: 80 Issue: 5 Pages: 456-461 Ref: 37 ref.

1990

บทคัดย่อ

Two osmotolerant strs (87 and 101) of C. sp. were tested for ability to reduce lesion development in Golden Delicious apple after challenge with 105 or 104 conidia/ml of the postharvest pathogens Botrytis cinerea and Penicillium expansum. Lesion size and frequency of B. rot were less in fruit pretreated with aqueous suspensions of strs 87 and 101 (107 and 108 c.f.u./ml) compared with controls pretreated with water. Significant, but marginal reduction of P. rot was observed in treatments with these yeasts at 108 c.f.u./ml. Biological control of B. rot was enhanced when wounds were treated with str. 87 at 107 c.f.u./ml in 2% (w/v) aqueous solutions of CaCl2, KCl and CaCO3 compared with aqueous suspensions of the str. alone. Salt solutions applied to wounds without cells did not reduce rot. The ability of the salt solutions to enhance control with yeasts was not related to the osmotic potential of the solutions. CaCl2 was the most effective salt. Yeast strs differed slightly in their response to CaCl2; a 1% concn enhanced biocontrol with str. 87, whereas a 2% concn was necessary to enhance control with str. 101. CaCl2 facilitated control of B. cinerea with yeast populations as low as 106 c.f.u./ml. Decay due to P. expansum was also reduced when fruit were treated with strs 87 and 101 in the presence of CaCl2.