Cherry bacterial canker fatal?
lifespeed
13 years ago
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fruitnut Z7 4500ft SW TX
13 years agolifespeed
13 years agoRelated Discussions
Cherries and bacterial canker...let a sucker grow?
Comments (1)A 30 year old cherry is still likely to have been grafted. So the sprout is unlikely to produce good fruit. I'd get rid of it and plant more if your new trees aren't enough....See Morebacterial canker?
Comments (5)No cuts? Perhaps not recently, but there is at least one. The center picture shows where a growth tip was headed back and the two nearest buds below took over and grow slightly off angle from the main branch. Textbook. This point is also where canker suspicion was noted. That cut would be a year old, or possibly two. It also is a narrow crotch angle where the two new leaders are growing inwards and smashing what was left of the original branch and at the same time forming a bark inclusion. This could cause bleeding. The lower right photo, by all appearances, is a wound where a small branch was cut off. I can see the branch's round collar left behind. I can also see the remainder of the branch itself within the collar. If this is not a branch cut, is is certainly a physical wound of some sort that would likely release sap. The upper right picture is less clear, but still looks a leaf cluster has been scraped off likely by accident. Its placement relative to the other leaf clusters is consistent. Again, I'd bet some sort of physical damage was done at this spot. All three cases appear to be physical intrusion into the tree's inner tissues. Sap running from those spots would be expected. If I'm right, that would be considered good news for your tree for it would not be showing indiscriminate, unexpected sap sites....See MoreBacterial canker on peach trees
Comments (8)Dennis, The bigger problem in cooler climates for peaches is perennial canker. Perennial canker (aka Valsa canker, Cytospora canker, Leucostoma canker) is caused by a fungus. It is certainly much more serious in my locale. The problem w/ perennial canker is that, well, it's perennial. Black perennial cankers want to just keep growing/expanding year after year. I believe it's worse in cooler climates because trees are damaged more by winter kill and southwest injury, as well as the fact the fungus grows at cool temps when the trees are inactive and have no defenses. As Drew alluded, bacterial peach canker is more rare in the north. It can cause complete collapse of the tree. My understanding is that sweet cherries are more susc. to bacterial canker than peaches. I've heard of whole orchards of sweet cherries collapsing and dying from bacterial canker. As Ramble mentions, I've always heard copper will help against bacterial canker, but the link below from U.C. Davis says that bactericides have no reliable effect on bacterial canker. Bactericides are effective against bacterial spot. Because of that, I wonder if people have reasoned bactericides must also be effective against bacterial canker, although that may not be the case. There are a few sources which indicate copper may help against bacterial canker, but I'm inclined to think it probably doesn't help. From what I can tell, bacterial canker has a modus operandi on stone fruits somewhat like fireblight on pome fruits. Both are caused by bacteria. Both can become systemic. Both can cause sudden collapse of the trees. Both can cause cankers, but the cankers don't expand appreciatively year after year. Copper is effective against fireblight, but that's only because it prevents the innoculum from entering the flowers. Once fireblight enters the wood tissue, bactericides like copper have no effect. The bacterium is more or less insulated from the bactericide. It appears the same thing happens w/ bacterial canker in peach/cherry, except that the bacterium mostly enters the tree through pruning, some other damage to the bark, or leaf scars, vs through blooms. Because of that, there would seem to be less justification in applying a bactericide for control of the disease. Once the disease is systemic, the pathogen would again be insulated from the bactericide, as w/ the case in fireblight. Anyway, that's my understanding of the topic. Copper is also a fungicide, and so may have some effect against perennial (fungal) cankers, although perennial cankers don't become systemic, like bacterial canker. Perennial cankers just keep growing until they girdle the affected limb and kill it. Here is a link that might be useful: Bacterial Canker on Peach...See MoreIs this bacterial canker?
Comments (1)To me it looks like an injury. It could lead to an entre to disease. I have this on young trees usually caused by animals, so far the trees have always been able to survive with a scarred trunk for several years. Al...See Moresautesmom Sacramento
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