Plant viruses are incurable; often, the best strategy is to remove the afflicted plant. On the other hand, viruses rarely kill woody plants, being content with merely distorting the foliage. Viruses can lay dormant for decades, waiting for the right plant to show up. Genetic susceptibility is the critical element; even ideal growing conditions won't prevent an infestation.
You can work around viruses by keeping plants vigorous so they're better able to resist the effects of an infestation. Sanitation can also help. Remove infected plants from the property immediately (don't compost them).
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