Question
I have a mimosa tree in Kansas and it has grown quickly and has bloomed every year.  This year, the leaves are falling off (turning yellow) and not nearly as many flowers.  It has this oozing foamin white stuff that appears in the base connection of the tree and various other areas.  There are new sprouts of leaves/branches.  What do I do about this foamy stuff?  Is there something I can treat it with?

Answer
I am sorry to say this sounds like a disease that is fatal to mimosa. It could be one of thwo things--Slime flux or mimosa wilt. Slime flux or wetwood oozes froth from the trunk and is caused by a bacteria in the wood generating pressure and the foliage looks healthy and green. Mimosa wilt is caused by a fungus  Fusarium oxysporium var. perniciosum. The oozing is on the trunk or the limbs and the foliage is dying due to the root sytem being infected.

Mimosa wilt is the most devastating disease of mimosa. In many areas it has almost eliminated ornamental mimosas. The disease can be found from Maryland to Florida and west to Texas.

Symptoms include chlorotic and wilting foliage. Discoloration of the outer ring of sapwood usually occurs, and trees may die within 6 weeks after becoming infected.

The organism survives in soil and enters through the tree roots. While the specific mode of action of this fungus is not known, the effect is to disrupt the upward movement of nutrients and water.

There is no control for the disease. watering and fertilizer (10-10-10) sometimes helps if caught early enough. To keep the wilt from spreading to other mimosa trees in the area this tree should be removed and destroyed.
Sorry!