Explore Plants
Ask Mr. Smarty Plants
Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.
Need help with plant identification, visit the plant identification page.
rate this answer
Thursday - April 01, 2010
From: Hillsboro, OR
Region: Northwest
Topic: Diseases and Disorders, Trees
Title: Why are my lemon Cyprees trees turning Black?
Answered by: Jimmy Mills
QUESTION:
I have 3 lemon Cypress plants - all are about 6 feet tall. One of them has started turning black on one side - like it's been burnt. The inside of the plant is also turning black. I assume something is eating it from the inside out. What can I do to stop it?ANSWER:
Lemon Cypress is a cultivar called Goldcrest or Golden Crest of Cupressus macrocarpa (Monterey cypress). This link from Floridata provides general information about the plant.
The TopiaryShop recommends checking your plants for aphids. They secrete a substance called honeydew which can give the plant a black sooty appearance from sooty mold growing on the honeydew.
It is difficult for us to diagnose plant diseases from a distance, so I'm going to suggest that you contact the folks at the Washington County Office of the Oregon State University Extension Service for some help closer to home.
More Trees Questions
Is oak leucanium an invasive species in Texas from Laredo TX
April 02, 2013 - Is Parthenolecanium quercifex considered an invasive species in Texas? Does this insect attach itself to redbuds? I spotted and removed from my small 5ft Texas Redbud last year. It seems that it has ...
view the full question and answer
What plants grow well in Athens, TX?
January 18, 2011 - Athens, Texas, we have very sandy soil mixed with clay, what plants grow well here?
view the full question and answer
Trees and shrubs turning brown in Dripping Springs TX
October 31, 2011 - Due to the extended drought - a number of trees and shrubs in our Dripping Springs area property have turned brown. Specifically: Live Oak; Agarita; Ash Juniper; Cedar Elm. Is this a dormant stag...
view the full question and answer
Possible disease on Eastern Redbud
October 06, 2007 - Our Eastern Redbud appears to be suffering from our recent drought. The leaves are turning brown in July/August on a few branches. A few black spots appear on the leaves before they turn brown. Ot...
view the full question and answer
Yellowing leaves on weeping willow
August 03, 2008 - We have a 4 year old Weeping Willow, 12+/- ft. tall and this week the leaves are starting to become yellow.
This willow is full and robust in appearance, best it's ever looked.
We have 2 other Wee...
view the full question and answer
 |
Support the Wildflower Center by Donating Online or Becoming a Member today. Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends. |
