Biological control of postharvest diseases of apple and pear under semi-commercial and commercial conditions using three saprophytic yeasts
1997
Chand-Goyal, T. | Spotts, R.A.
The yeasts Cryptococcus laurentii (strain HRA5), Cryptococcus infirmominiatus (strain YY6), and Rhodotorula glutinis (strain HRB6) were tested as biocontrol agents of postharvest diseases of apple and pear in semi-commercial and commercial trials. The yeasts effectively controlled decay when applied in a drench or line spray. The yeasts were not adversely affected when treated fruits were stored in a controlled atmosphere consisting of 1% oxygen and 99% nitrogen. In a commercial trial, the most effective treatments for control of blue mold of pear were a combination of C. laurentii and C. infirmominiatus (91% control) and the commercially recommended high rate (528 micrograms/ml) of thiabendazole (88% control). In the commercial apple trial, the most effective treatments for blue mold were C. infirmominiatus combined with 264 micrograms/ml thiabendazole (91% control), C. infirmominiatus combined with C. laurentii (84% control), and thiabendazole alone at 528 micrograms/ml (79% control). The combination of C. laurentii with 264 micrograms/ml of thiabendazole was significantly more effective for control of blue mold on pear than thiabendazole at 528 micrograms/ml whenever any thiabendazole-resistant spores were present in the inoculum.
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