ISHS Acta Horticulturae 232: International Workshop on Apple Culture in the Tropics and Subtropics
GENETIC RESISTANCE TO BITTER ROT INCITED BY GLOMERELLA CINGULATA (STONEMAN.) SPAULDING & VON SCHRENK IN APPLE (MALUS DOMESTICA (BORKH.)) |
| Authors: | A.P. Camilo, R.C. Lamb, H.S. Aldwinckle |
| Abstract:
Apple bitter rot may be a serious disease whenever high temperature (24–28°C) and high humidity (above 80% R.H.) occur simultaneously. The development of resistant apple cultivars is a possible means of control of this disease. Studies were carried out to identify sources of resistance in apple to Glomerella cingulata. It was found that fruit may start to get infected, generally, in early August in the Northern hemisphere. The stage of fruit development did not seem to exert a strong influence on fruit susceptibility, unless fruits were overripe. Although no immunity was detected, a high level of resistance was found in the following crab apple: M. zumi var. calocarpa, M. prunifolia var. xanthocarpa NA 3604, M. x sieboldii 301, M. purpurea 'Lemoine', M. x sieboldii AA 852, M. nieuwlandiana, NY-78231–3, and NY-78231–6. Red Rome, NY-53710–95 and NY-55 were examples of large-fruited clones with a high level of resistance to Glomerella cingulata. When fruit have passed the climacteric stage, even the most resistant clones may become susceptible, probably due to physiological changes in the fruit. However, as apples are generally harvested before they reach the climacteric stage, that partial or total loss of resistance may not be very important. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
