Testing canker in scions

The source of the inoculum is of importance to keep trees free of cancer.

Inoculum from fruit parcels leads to a reasonable degree of failure (the worst parties can have up to 10% failures) while inoculum from seed gardens is of good quality. There has been developed a rapid detection method to determine cancer in plant material, but such a method does not exist for inoculum.

The goal of this project is to provide a detection test for cancer in scions / graftwood to estimate the degree of contamination of a party.

It seems possible with the developed test to show cancer in asymptomatic scions. As there were found many false positives in one variety, possibly because traces on the outside of the scions gave a positive signal, the test is not yet fit for practice.