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Treating Freeze Damage
Be patient! Wait to determine the extent of damage. Look for graft or bud union. Make sure fruiting wood above the graft is still green and healthy, producing new buds in the spring. If there is little rain, check soil to make sure it is moist. Fertilize lightly.
If the tree experiences leaf drop, watch for appearance of new buds. Prune tree back 25-50%. (Citrus normally stores its winter food in the leaves, so if the tree defoliates it must draw from limited reserves in the roots) If need be, protect stems from sunburn with 50% dilution of white latex paint.
Bordeaux spray (10 parts Copper sulfate, 10 parts zinc sulfate to 100 parts water) is good for winter diseases when there is a lot of rain or high humidity.
In the future, try some of our techniques for minimizing frost damage.
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