Identification of antagonists for biological control of the post-harvest pathogens Pezicula malicorticis and Nectria galligena on apples.
1992
Schiewe A. | Mendden K.
More than 700 isolates of microorganisms occurring naturally on apple trees and fruits during the growing season and on stored fruits were collected. The isolates were screened in vitro and in vivo for antagonistic activity against the post-harvest pathogens Pezicula malicortis (Jacks.) Nannf. and Nectria galligena Bres. In agar cultures, 50 of these microorganisms were found to be antagonistic against one or both of the pathogens. On apple fruits, inoculated with the pathogens, four bacterial and three fungal isolates were able to reduce lesion development at 20 degrees C. At 4 degrees C, however, these isolates had little effects on lesion growth. Only culture filtrates from fungal isolate 725 reduced lesion growth of both pathogens at 20 degrees C and of Pezicula malicortis at 4 degrees C.
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