ISHS Acta Horticulturae 193: XIII International Symposium on Fruit Tree Virus Diseases
A MYCOPLASMA-LIKE ORGANISM ASSOCIATED WITH A DECLINE-LIKE DISEASE IN ENGLISH PEARS |
| Authors: | D.L. Davies, M.F. Clark, A.N. Adams |
| Abstract:
A widespread disease in English pears, commonly known as Parry's disease, mainly affects trees of the cultivar Conference from two to eight years old growing on quince rootstocks. Symptoms are frequently transient in nature and resemble mild forms of pear decline. The precise aetiology of the disease is unclear, but examination of bark samples by DAPI staining and u.v. light microscopy indicate that infection with mycoplasma-like organisms (MLO) is widespread in English pears. Furthermore, there appears to be a correlation between MLO infection and occurrence of the disease. MLO infection was detected in one- and two-year-old pear seedlings grown in the field at East Malling, and these gave symptoms diagnostic for pear decline when grafted with scions of the indicator cv. Precocious. | |
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