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<pre>hii

Yellowing of olive leafs occur from the Verticillium fungii,
causing gradual death of the tree in 3-5 years, or water
stress-heat stress, or lack of nitrogen due to competition
avaialability problems or water-logged soil


My advice: dig around or take out a tree with a tractor and
check the soil and root system (take photos and invite other
specialists and friends for their opinions

Ariel
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