Problems Soon Begin Showing Up on Leyland Cypress

— Written By Bill Hanlin and last updated by JoAnne Gryder

bagwormonarborvitaeFor the last couple of years, we have been getting numerous calls from people with problems on their Leyland cypress trees. The trees were initially planted because they had few insect and disease problems, and they grew fast. Now we are starting to see problems starting to show up on these trees.

Bagworms are a common problem on leylands, and, if left untreated, they will defoliate and kill the tree. These insects can be easily controlled either by removing them by hand or applying an insecticide. Insecticides should be applied in the summer, when the bagworms are active.

Numerous diseases have begun to show up on local trees. Seridium canker, Botryosphaeria canker and Cercospora needle blight are all diseases that will kill limbs and twigs on leylands. Trees with Seridium canker and Botryosphaeria canker will have leaves that will turn a reddish-brown.

Currently, no fungicides are available for Seridium and Botryosphaeria canker control. You can reduce disease problems by maintaining healthy trees. Mulching will help the trees from being stressed and reduce their susceptibility to diseases. Pruning out infected twigs and branches will also reduce the spread of diseases.

Leyland cypress trees can also suffer cold damage during the winter. The problem with cold damage is that it will not show up until spring and may be confused with disease symptoms. Avoid fertilizing leylands in the fall of the year so that their foliage hardens off before cold temperatures arrive.

Wilkes County Farmers Market. The Wilkes County Farmers Market, located at 812 CBD Loop in North Wilkesboro, will be opening this Saturday at 7:30 am. This is the earliest the market has opened in recent years. Anyone interested is selling at the market should contact Crystal Keener with the town of North Wilkesboro

Written By

Photo of Dr. Bill HanlinDr. Bill HanlinRetired County Extension Director (336) 651-7333 william_hanlin@ncsu.eduWilkes County, North Carolina
Posted on Apr 13, 2016
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