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27-Dec-2005
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#1 |
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Enthusiast
 
Join Date: Feb-2005
Location: Carlsbad, California..coastal desert
Country: United States
USDA Zone: 11
Posts: 5,433
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Question about copper sprays
With cherry trees (prunus incisa, in this case) you are supposed to hit them with copper dormant sprays. Can anyone give some hints about just how to go about this? What brand(s) do you like? Do you soak the tree, do you avoid getting it on the soil, how much and how often do you spray?
Thank you for any help. Joanie Last edited by Joanie : 27-Dec-2005 at 01:07 PM. |
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Question about copper sprays |
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27-Dec-2005
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#2 |
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bonsaiTALK Master
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No answers, more questions.
To add to the question, more generally, what dormant spray do you use and what species of trees can you use it on? What trees can't you use dormant spray on? My husband sprays his fruit trees twice in the winter. With bonsai is once enough?
Here's to fewer bad bugs in 2006! Carmen |
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27-Dec-2005
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#3 |
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bonsaiTALK Master
 
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Joanie, for what disease do you want to use the dormant copper sprays on the cherry trees ?
Normally, dormant copper sprays are put on the trees in spring just before bud brake to prevent infection from leaf diseases that re-occur every year like scab on apple trees. All you have to do is to spray the fungicide all over the branches with a good sprayer at the recommended dose making sure that the fungicide gets every where on the branches and truncs. Regards. |
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27-Dec-2005
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#4 |
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Enthusiast
Join Date: Feb-2005
Location: Carlsbad, California..coastal desert
Country: United States
USDA Zone: 11
Posts: 5,433
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Brent from Evergreen says:
"Prunus almost universally suffer from winter and spring fungal diseases and should be treated like fruiting trees. A fixed copper dormant spray several times a winter will protect most species." Farmington Gardens says: "Flowering cherries are in the family Rosaceae which is, in general, susceptible to several fungal and bacterial problems if left unchecked and untreated. Two great ways to reduce this are to keep the plant growing healthily, and a dormant spray program. A healthy tree will naturally fight off many potentially harmful problems. And a dormant spray will clean up any overwintering pests and diseases, preventing or greatly reducing the outbreak of any big problems. " Black knot, plum pockets, X disease, peach leaf curl.... all these have been mentioned on the websites dealing with large sized cherries. I don't know what we may get in our area, and my trees were fine this summer (the first year I owned them, though)
Does that help, or do I need to talk to someone in this area about what we may be facing?
Thank you for helping, Aldevaux!
 Joanie
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28-Dec-2005
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#5 |
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bonsaiTALK Master
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Yes, Joanie, it makes sense because cherry trees should be protected because they are very susceptible to bacterial canker and to black knot(a fungal disease) which can both kill the trees if not well controlled. They are common on wild cherries which are generally the sources of infection and I beleive they are also common in California.
Copper sprays applied either at leaf fall in autumn or as a dormant spray in spring have been very effective for controlling bacterial canker (Pseudomonas species) on sweet cherries. But cherries are can also be affected by insect pests and mites. Dormant Oil sprays need also to be applied when trees are dormant from november through march, after all the leaves have fallen. Mix with water as directed and spray to all surfaces of the trunk, branches and twigs. Apply when the temperature is expected to rise during the day. However, temperatures below 35 F can sometimes damage the bark. Dormant oil sprays control aphids, scale, spider mites, and many other insects by desiccating or smothering eggs and larvae. Best regards. |
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28-Dec-2005
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#6 |
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Enthusiast
Join Date: Feb-2005
Location: Carlsbad, California..coastal desert
Country: United States
USDA Zone: 11
Posts: 5,433
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Thank you very much! That helps a lot! So there are two different sprays, for two different problems.
Do we use the same dilution that the instructions give, even though our trees are small and are in pots? Do we protect the soil, or let the drippings run down into the soil? Do we try not to water the trunk and branches the next couple of times, or does it matter? I've never used this sort of chemical before, sorry for the very basic questions! Joanie |
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28-Dec-2005
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#7 |
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bonsaiTALK Master
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Yes, there are two dormant sprays : one for diseases (copper or sulphur)and one for insects and mites (horticultural oils) and they should be used at the recommended dose or dilution even when the trees are small or in pots.They could also be miixed together in the same sprayer.
Copper sulfate (sometimes called "fixed copper") is the best and most widely used dormant spray. As it is a powder that is mixed with water, it tends to settle out of solution, so you need to keep shaking the sprayer often. Lime sulfur is as effective as copper and maybe easier to spray although it smells like rotten eggs, however, it is very irritating to the skin and eyes. As I said, the dormant spray oil can be added to either material in the same spray mix. Since both copper sulfate and lime sulfur can be irritating to the skin and eyes, it is very important to wear gloves, long sleeves, and goggles when you spray them -- especially if it's likely to drift with wind. The dormant oil is very low in toxicity. If it rains on the tree within 24 hours of spraying you should spray again because the spray did not have time to stick well enough. It might be better to protect the tree from rain until the spray is well dried. It does not matter if the spray falls on the soil but wait at least 2 days after application before wetting any part of the tree that was sprayed. |
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