fungus or scale or Pyracantha

Asked October 19, 2019, 7:42 AM EDT

Hi, Some kind of scale or fungus is coating the branches and leaves of a pyracantha. It is planted in a small protected garden. Grows on west facing wall. I trimmed back some of the growth before recent rain and it looks better, but much of scale remains. Should I spray this with some kind of garden chemical? Please advise. Plant has been in the ground about 10 years.

Howard County Maryland shrubs pest insects and mites

1 Response

Hi - In your first photo, it looks like there is an infestation of woolly apple aphids. These are fairly common on Pyracantha shrubs. Natural enemies like parasitic wasps can help to keep populations down. Large infestations can be reduced by spraying with horticultural oil or insecticidal soap. https://extension.umd.edu/hgic/topics/woolly-aphids-trees

The second photo is blurry and we cannot see enough detail to determine what is there. Please send a clearer photo if there is another issue besides the aphids.

This article has more information about woolly apple aphids on Pyracantha.
https://ecoipm.org/2015/05/29/woolly-apple-aphids-on-pyracantha/

Christa