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Effect of Pear Vein Yellows Virus and a Nonviral Factor on the Performance of Pear Trees1


Pear Vein Yellows Virus (PVTV) did not significantly reduce growth, yield, or quality of several pear cultivars grown in a hot and arid region except for the cultivar ‘Anjou’ (Pyrus communis L.). Evidence was obtained for the presence of a heat-sensitive nonviral factor associated with the strain of PVYV from ‘Packham's Triumph’ pear. This combination caused reductions in growth and yield and an accumulation of abnormal amounts of phenolic compounds in the fruit.