Cherry Bacterial Canker - Should I Remove Destroy?
wolfridgeil
8 years ago
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wisconsitom
8 years agowolfridgeil
8 years agoRelated Discussions
Bacterial canker on potted cherry trees
Comments (2)Thanks for the reply, Fruitnut. I spent the evening reading up on bacterial canker. The reason(s) I consider destroying the trees is because of comments in several documents to not interplant new trees with old trees, specifically to reduce the amount of bacterium the new trees are exposed to; and to remove and destroy branches and trees killed by p.syringae (same reason). Granted, mine haven't died yet and a couple look they've actually beaten the infection. I'd especially hate to toss my 2 Lamberts on Gisela 5 as Lambert is hard to find on dwarfing rootstocks (at least for Californians). Maybe I'll move the infected trees to an isolated corner of the yard. gary...See MoreRootstocks and Bacterial Canker
Comments (1)I had a bad canker on an Apricot tree. A bearing tree that looks nice. The woods next to my property are thick with wild cherry with cankers and black knot. I cut these down and burned them for fire wood. I was determined to treat the Apricot to see how much I could control the canker in case another tree began to get it. I cut away all the infected trunk canker with a knife. I periodically rubbed dry copper, like for dusting vegetables and the canker has not erupted any more. I'm pretty sure the canker is not making inoculum but I would like to see the bark begin to heal over to call a success. The moral of the story is to go out and cut the bark away to cut out the spore producing area and sanitize with copper dust. Or you can let the canker spread under the bark then cut the tree for fire wood....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 Moresick cherry - what should I do ?
Comments (9)All I could think of was to use something anti-fungal, so I sprayed a bit of copper-blue mixed in water. ==>>> may i suggest that you confirm any and all diagnosis.. BEFORE you start spraying things around your garden ... I had sprayed everything around my house a few times with aerated vermicompost , ==>> i dont have time to research this.. but again... more spraying ... and ===>>> P.S. the "whitish" color on the leaves of the sweet/sour cherries is most probably an excessive dose of zeolite in my last foliar spray. you might want to try the FRUIT forum .... those peeps might be able to lead you toward resources for crop control ... also google: IPM.. integrated pest management.. which includes disease ... i would suggest.. that you have used more sprays.. than i have in the last 10 years .... and unless you have a rather large orchard ... i simply dont know why ... it seems you have an inclination to over reacting .. and over spraying .. on extremely young plants ... it is unfortunate that you are in croatia.. in the sense.. as jean notes.. we dont know where to refer you for guidance on a local level ... here in the states.. it would be the Agricultural office ... it became very problematic for me.. when i tried doing this.. wondering if i was shortening my life with all the exposures to sprays.. in the quest to grow some fruit.. to make me healthier ... i gave up over the years... figured that too much spraying wasnt good for ME... good luck ken...See Moreeastmeetwest
8 years agowolfridgeil
8 years agowolfridgeil
8 years agogardengal48 (PNW Z8/9)
8 years agodrew51 SE MI Z5b/6a
8 years agolast modified: 8 years agoeastmeetwest
8 years ago
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drew51 SE MI Z5b/6a