How did you show that the HoneySweet trees are resistant to plum pox?
Trees were tested in a greenhouse for five years. Plant tissue infected with PPV was grafted onto the new trees, but none of the trees developed plum pox disease. Trees were also grown in Spain, Poland and Romania, where PPV is indigenous, and none of the engineered trees have ever been infected by transmission through aphids, which naturally carry the PPV virus from tree to tree.
