Xtremehorticulture

Cause of Leaf Drop in Chitalpa

Q. Is it common for the Chitalpa tree to partially
defoliate in the summer? What would be the optimum amount of water for 15-foot
Chitalpa tree growing in Kingman, Arizona?
Not the readers chitalpa but s picture I had.
A. Chitalpa, like some African sumac, is notorious for
leaf drop in the middle of summer. According to several authorities from New Mexico and Arizona this is common with this tree.

Bacterial Disease

            According
to the plant pathologist from New Mexico State University, this tree has a
bacterial issue that causes some of its water tubes to get plugged. This causes
the leaves on the tree to get scorched like it’s not getting enough water and
in severe leaf scorching, the leaves drop.
            It’s
similar, if not the same, disease we see on grapes called Pierce’s Disease. You
can try giving it more water all under its canopy and see if that helps. If
it’s a lack of water because it’s not getting any you will see the tree
improve. Anyway, apply enough water to wet the soil under the canopy a depth of
2 feet.

Spread to Grapes

            From
what I understand there is no cure for this disease and  ach plant has it because of how it’s
propagated. Some scientists think this disease may be transmitted by a small
insect similar to a leafhopper. So, get rid of any weeds growing nearby to the
tree. It is possible this disease could be spread from your Chitalpa to nearby
grapes. The symptoms are similar; leaf scorch and leaf drop but in grapes its
eventual plant death.

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