14+ Black Spots On Yucca Leaves. Cause coniothyrium bartholomaei, a fungus, has been found on yucca in oregon. Yucca plants grow outdoors in hot arid climates.
It is a seed borne bacterium. Some simple advice on yucca care yucca are pretty hardy plants, and so long as you exercise some common sense and are aware of the basics you should the less light they get, the more they stretch towards the light source. Department of agriculture it's natural for some yucca leaves to yellow, but severe yellowing may indicate a problem.
Cladosporium herbarum (formerly mycosphaerella tassiana) has been reported from washington, and phaeosphaeriopsis obtusispora (formerly.
Learn how to look after them with this informative yucca care guide. The outer margins of the black circles are ragged or feathery and they are usually surrounded by a ring of yellow. It should be full of new growth by now as leatherback pointed, but it is not. Let's dive in in the causes.