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Freeze opens door to damage from olive knot

Issue Date: September 10, 2014
By Kathy Coatney

The freeze in 2013 damaged table and oil olive trees. The cold snap caused splits in the bark and defoliation of the leaves that left openings for the bacterial pathogen, pseudomonas savastanoi, to infect the trees during spring rains. The resulting olive knot has been seen in orchards across the north state and, surprisingly, in the Central Valley, where they generally don't see olive knot.

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