Question
Hi,

I have several Yucca inside that have always done very well.  Now I notice the new growth at the top of each plant is starting to die.  Looks like a thick layer of dust forming on the leaves.  The rest of the plant looks fine.  I am seeing this on 3 plants.  Perhaps a fungus or a disease?

Answer
Gareth,

I have not had or heard of a yucca with a fungal or bacterial problem. Their problems are usually from too much water and not enough sun. I reccommend that you increase the sun if at all possible, decrease the amount of water that you are giving it and just to be sure there is not a fungal or bacterial problem you could spray it daily with Lysol spray for 2 to 3 weeks.  Be sure to spray all possible areas that you feel could have a problem. I have solve both fungal and bacterial problems using a generic version of Lysol spray over a 3 week period. Good luck.

Darlene