A lot of oak trees in San Marino are under stress from too much watering of the parkway strip. For example, the tree trunks are washed down regularly from sprinklers. The parkway strip is watered regularly at 1480, 1430 and 1310 Lorain Road. There is so much watering at 1430 that there is sign of moss and thinning of the canopy.
Oak trees are falling down. When will the Parks Dept start telling howeowners to stop watering?
Lots of info on over watering of oak trees: http://www.google.com/search?hl=en&q=over+watering+oak+trees&aq=f&oq=
http://www.lacity.org/BOSS/UrbanForestryDivision/index_prunninginfosheet.htm
Oak root fungus: http://groups.ucanr.org/slomg/documents/Pests_&_Diseases3863.htm
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