Avocado Leaf Sunburn?
Today I discovered 2-3% of the avocado tree leaves show signs of being burned. Only the side of the tree that receives the most sun is affected (so far). Most of the tree, including both old and new growth looks perfectly fine.
I normally water the tree once a week with about 250 gallons at a time during these summer months.
This past week I was a few days late. What reminded me was seeing about ten young avocados on the ground. I've been late before and the tree hasn't been so sensitive to water, so I'm skeptical that is the cause.
A month ago I sprayed the entire tree with Bonide All Season Spray (98% Mineral Oil) and it seemed to do a great job with the persea mites. Everything looked healthy afterwards.
The leaf burn has come on suddenly in the past week. We've had no extreme heat during this time (mid-70's to low-80's).
What's going on?