The effect of some epple viruses on the susceptibility of two clonal rootstocks to collar Rot caused by Phytophthora cactorum

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Abstract
The incidence of collar rot caused by Phytophthora cactorum was increased in a stoolbed of MM. 104 apple rootstocks when they were infected by some apple viruses. Greater numbers and weights of rootstocks were harvested from the healthy MM. 104 stools and fewer died, than in the virus-infected treatments. A combination of rubbery wood virus, stem pitting virus, epinasty and decline virus, chlorotic leaf spot virus and platycarpa scaly bark virus caused the greatest reduction in growth and were associated with the most severe collar rot infection. The same viruses without rubbery wood reduced productivity less severely and fewer stools died. The growth of MM. 106 was only slightly checked by the same virus treatments, and the stools were not affected by collar rot. Apart from the check to growth no virus-like symptoms were seen on either rootstock.

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