Insect or disease ID on Burning Bushes

Asked April 6, 2020, 11:50 AM EDT

We have a disease or insect forming these webs that are taking over our burning bushes. Before we just apply a generic treatment we would love to know what it is and specific treatments. It is eating its way through our 6 foot high hedges.

Jefferson County Kentucky

4 Responses

Euonymus can be a host for web worms or caterpillars. Have you seen caterpillars this spring? If so eastern tent caterpillars are suspected, but they do not normally feed on euonymus. If no caterpillars are present then the fall web worm or forest tent caterpillar was there last fall and you are seeing the empty nest.

Spraying is only recommended if the caterpillars are there and young, about half an inch. Larger specimens are too big to be controlled with insecticides. There are many labeled insecticides for caterpillar control.

The good news is they rarely cause permanent damage. the foliage grows back quickly in most cases. Of course stressed or otherwise unhealthy plants may not recover quickly.

-CaroL

Carol Wilder

Horticulture Technician

Carol.wilder@uky.edu

Jefferson County Cooperative Extension Service

4200 Gardiner View Ave. Suite 101.

Louisville, Ky 40213

502-569-2344

Fax 502-569-1680




Euonymus can be a host for web worms or caterpillars. Have you seen caterpillars this spring? If so eastern tent caterpillars are suspected, but they do not normally feed on euonymus. If no caterpillars are present then the fall web worm or forest tent caterpillar was there last fall and you are seeing the empty nest.

Spraying is only recommended if the caterpillars are there and young, about half an inch. Larger specimens are too big to affect with insecticides. There are many labeled insecticides for caterpillars.

The good news is they rarely cause permanent damage. the foliage grows back quickly in most cases. Of course stressed or otherwise unhealthy plants may not recover quickly.

-CaroL

Carol Wilder

Horticulture Technician

Carol.wilder@uky.edu

Jefferson County Cooperative Extension Service

4200 Gardiner View Ave. Suite 101.

Louisville, Ky 40213

502-569-2344

Fax 502-569-1680




Thanks Carol. I have not seen any caterpillars. Having our lawn care people reviewing it as well and they have not seen any caterpillars. The webs were not present in the winter but are visible now again (over last month) . Does that suggest they are back forming new webs? Should we remove all of the evidence carefully and treat for caterpillars?

Few other insects make this type of web. So, if there is no damage to new foliage, just rake out the webbing and let it be. If damage is present then spray for the caterpillars as they may be very small.

Landscapers should be familiar with eastern tent caterpillars so if your service says there is no insect then I wouldn't spray.

-Carol