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A dieback of pears observed in France and resembling pear decline or moria

, : A dieback of pears observed in France and resembling pear decline or moria. Acta Horticulturae (44): 131-138

A disease characterized by 2 types of decline was observed in the Beurre Hardy budded on seedling pear. A slow decline of about 4/5 of the trees began with an early reddening of the undersides and then the upper sides of the leaves which were often small and deformed. In the following year 16% of the trees thus affected appeared to be cured but the remainder grew poorly and had reduced leaf area with many clustered leaves.

Accession: 000270620

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Related references

Shalla, T.A.; E.A., 1961: The probable coidentity of the moria disease of pear trees in Italy and pear decline in North America. Pear decline is currently the most destructive disease of pear trees in western North America. It is estimated that over 100,000 trees were killed by this disease in California alone during the 1960 growing season. Trees die by a gradual loss of v...

Jarausch, W.; Dosba, F., 1995: First report of pear decline phytoplasmas on Nashi pears (Pyrus pyrifolia) in France. Symptoms of pear decline observed on pears (Pyrus pyrifolia cvs Kosui, Shinseiki and Nijiseiki) in the southwest of France from autumn 1992 were found, by using polymerase chain reaction (PCR) amplification, to be associated with the presence of p...

Lemoine, J., 1975: Pear decline like symptoms observed in France. Acta Horticulturae 44: 31-138

Refatti, E., 1964: La moria del pero in Italia. (Moria disease of pears in Italy. Symptoms and methods of diagnosis are described. Rootstock susceptibility appears to be lower in Pyrus communis than in P. serotina or P. ussuriensis, and symptoms have not so far been observed on trees grafted on quince or P. betulaefolia. It is...

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