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Quote:

Originally Posted by soltan

The concern I have is that I thought it was generaly accepted that any water fit for human consumption could do no harm to trees?
I would hate to have to cart water or something other than the housewater supply for the amount of trees I have.

I will try to find the salt content of our house water,What is acceptable?.
I have fertilised very little this year.
I will give all my trees a big drenching to remove any salt buildup. This may help as I tend to drench the soil but I generally don't water for any longer. ie no flushing.

jbhayman I am glad to hear it seems all are happy to call this leaf burn and not a disease.
As I stated I have trident seedlings in the ground some I hardly ever water and they get plenty of sun and have no leaf burn. I feel some how to blame for my potted ones troubles. I hate leaf burn

Water with a high salinity can cause tip burn and leaf scorch in plants but will not be harmfull for humans consumption because the concentration for us is usually not high enough .
By the way, leaf burn is definitely a well known plant disease. It is not a parasitic disease but what we call a non-parasitic or physiological or abiotic disease.
Since you did not fertilise your trees very much, your problem could be an insufficient amount of feeder roots in your pots (as in the case of pot-bound roots) where water is not absorbed fast enough to supply the leaf tissues when they transpire too much in hot weather conditions.
If it is your water that has too much salt, here are some links that will give you a good explaination of salinity and the way you can measure it :
http://www.waterwatch.org.au/public...electrical.html
http://www.nutri-tech.com.au/produc...ivity-meter.htm
http://www.nutri-tech.com.au/produc...ivity-meter.htm
http://crops.confex.com/crops/wc200...gram/P14169.HTM
Good luck.