From late summer last year, most of my fruit trees got some sort of diseases that caused the leaves to fall and not grow any fruit. See attached pictures. It seems to affect sweet and sour cherries, chokecherry, plums and avocado tree. My apple tree stayed unaffected. The spring is here and I started to see the same symptom again. I am really concerned about the trees. Can anyone help identify the diseases and possible treatment? thanks in advance.
The gardener could have spred lawn fertilizer on the tree soil. But that's very small amount and shoudn't have caused seriouse issue like this. Over watering... possiblly... but it can't last more than a year?
I am no expert but I suspect it's a bacterial disease. Does not look like over watering. possible cause Pseudomonas syringae
Your image looks exactly the issue I am having. What kind of treatment should I perform? Can you recommend a product that is commonly available? Much appreciated.
Try adding plenty of dolomite to increase the PH, plenty of sulphate of Potash to get rid of those burnt leaf tips and strengthen the trees, and a lot of compost along with a good dose of fish oil fertilizer(Organic).
I can't imagine needing to increase the pH anywhere around Southern California where the soils are alkaline to begin with. Compost and fish emulsion sounds good though. Hey my post count is unstuck!
Desert soils typically don't lack much of anything but possibly nitrates. A soil test might be a good idea if you have other ailing plants. An agricultural extension agent is more likely to nail down the problems than folks half an continent (or world) away. http://cesandiego.ucdavis.edu/Agriculture,_Horticulture_and_Landscape/
