What causes leaf drop on citrus?

[Dave_E]

Hi All,

My (2) mandarin trees (in pots) have been outside for well over a month now, both seem to be doing well. This morning I walk the garden to find (12) leaves from one tree on the ground, with a stem that is bare except for the little nubs that went to the leaves. Watering is going well, I use the finger AND a gauge, but as with all potted plants, the first 2-3 inches can be dry as a bone and the at the 15” line it can be a mud cake. Any ideas? Night temps are hitting 50-51 F and days are touching 75-80 F.

Dave

[1rainman]

Typically caused by stress. Moving outside might be a big adjustment. Better to ease them out a few hours bring back in then leave them out longer each time until they are permenently outside. They dry out quickly outside in pots too.

[Millet]

Frequently ones finger to test for moisture can cause problems.  The top inch of soil frequently is dry, while the deeper soil still fully wet.  A better method of testing is by lifting the container.

[poncirsguy]

Frequently ones finger to test for moisture can cause problems.  The top inch of soil frequently is dry, while the deeper soil still fully wet.  A better method of testing is by lifting the container.

Right on.  It is the method I use.

[BorisR]

There is a yellow central vein on some of the leaves, and the pot looks large. My guess is that the plant has a root problem due to overwatering.