Sharon Reeve wrote:I water every ten days or so. I check the soil and if it is moist i do not water. When i do water I water deeply. I have not watered this winter at all. They have also gotten increasingly shaded by some pines nearby. This may have something to do with their ill health.
I had problems with my citrus, and looked on the web, and requested advice and ended up with no satisfaction. The pages I found which described the symptoms were vague, and if I did try what they say, it didn't seem to make a difference. The advice I was given was never "I've had that exact problem, and this is what it solved for me", instead it was "Your problem is this, and this will solve it" and it never did.
It's also conceivable that there is something present (as opposed to absent) in the soil that is harming them. Salt, for instance, is a frequent problem in CA. A soil test might be in order if the trees are large and valuable.
In addition, are you certain the problem is from the soil at all? How long have you owned the property where the trees are, and have they always been in the condition they are now? Perhaps a previous owner let them dry out or otherwise abused them..... Have you checked for insects and diseases.....sublte things like scale can be hard to see and yet cause plenty of damage.....