Bacterial canker of cherry trees is a killer. When young sweet cherry trees die, the cause is more likely to be bacterial canker of cherry than any other disease in wet, cool areas like the Pacific Northwest. If you want more information about the latest methods of treating bacterial canker, read on.
Bacterial Canker of Cherry
What causes bacterial canker on cherry trees? Bacterial canker is a disease caused by the bacterium Pseudomonas syringae pv. syringae. If you see dark, sunken cankers on young fruit trees, your orchard may be infected. These are the first sign of bacterial canker on cherry trees. A careful inspection of the canker will help identify the disease. The inner tissue of the canker is orange. Brown streaks push up and down the branch into healthy tissue. Bud infections are also common, resulting in dead cherry blossom buds. The infected trees ooze gummy fluid, leaves droop, and entire limbs may be girdled by the cankers. Trees may die when the temperature rises. Infection with bacterial canker usually occurs on cherry trees younger than eight years old. The bacteria often enters via heading cuts, but can also take advantage of frost damaged tissue and insect injuries.
Treating Bacterial Canker on Cherry
Complete bacterial canker control remains a hope for the future. As of now, the best a gardener can do is manage bacterial canker on cherry. No product exists for treating bacterial canker or eliminating it. A good place to start managing the disease is selecting bacteria resistant cultivars. Some of the best resistant cultivars include Ranier, Regina, and Sandra Rose. Picking disease resistant rootstocks, like Colt, is another step in bacterial canker control. You are better off using an integrated approach to manage bacterial canker of cherry. The most important step is to prevent injuries that could allow bacteria to enter the tree trunk and branches. This includes both natural and manmade injuries. Here are a couple ways to prevent injuries:
- Paint tree trunks white to reduce winter injury.
- Only prune your sweet cherry trees in dry weather, like in summer, rather than during rainy spring or fall seasons. If that won’t work for you, prune in cool, dry periods in mid-winter. Heading cuts and leaf scars are particularly susceptible to infection.
It’s important in bacterial canker control to select a well-draining site for your cherry orchard. Plant cherry trees in well-drained soil and be sure to water and fertilize them appropriately. Stressed trees are more likely to infect than healthy ones. However, keep irrigation water off the tree’s canopy at least for the first year after transplanting.
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Teo Spengler has been gardening for 30 years. She is a docent at the San Francisco Botanical Garden. Her passion is trees, 250 of which she has planted on her land in France.
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