Forgive me for saying so, but it appears the plants are suffering badly from over-watering and a lack of aeration in the soil. It's sad to see a tree in this condition.

Al

Well,i explained over on the C&S forum the behavior of the wet/dry forest plants of Mexico in California. Basically,the cold replaces drought as a trigger to de foliate. Happens every year tapla for both plants like clockwork. When i took this picture we just had 102f degree day!..you water then-lol.