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Red Cedar Cercospora Needle Blight
News Release - Horticulture
Linda Dannehl
University of Nebraska-Lincoln Extension
June 22, 2011
Check Cedar Windbreaks for Diseases
“My cedars look like they’re dying - what’s wrong?” seems to be a common question from people who have windbreaks containing rows of eastern redcedar.
Although there are several damaging disease problems on eastern redcedar, and other juniper trees, the one that seems to be most prevalent and the most damaging is Cercospora Needle Blight. Cercospora also appears to be more severe the last few years because of the cool, wet weather conditions which enhances its spread.
Often landowners do not recognize needle blight until the disease is in the severe stage. Control is necessary as severe infections over three or more years may result in mortality.
Cercospora needle blight is readily distinguished from other juniper diseases because the disease infects older foliage first. The foliage turns brown, dies and falls off, typically from the interior of the tree crown, outward and from the lower branches to the higher branches. Severely infected trees may only have a small tuft of green foliage on the branch tips.
Cercospora needle blight can be effectively controlled by spraying trees with a fungicide containing copper, e.g Bordeaux, or containing mancozeb, e.g. Dithane. At least two applications are necessary for best control. The first treatment should be applied during the second or third week in June, and the second treatment about the third week in July. If frequent rains occur in August and September, monthly treatments may be necessary for good control. It will also help to increase air flow around trees by thinning out and removing crowed trees.
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Source: Dennis M. Adams, forester
Water & Environment Programming
We provide research-based programs and educational materials to help you understand the value of Nebraska’s natural resources and the value of good stewardship to ensure sustainability of those resources. More information.
Water & Environment News
Nepal and Tibet: International Trip An Eye-Opening Experience
By Sharon Skipton, UNL Water Quality Educator
My areas of focus at UNL include drinking water systems and wastewater treatment systems. As related to those focus areas, this trip was very educational. The World Health Organization reports that approximately 3 million people die each year from water borne disease. According to the United Nations, 2.5 billion people do not have access to basic sanitation or toilets. The Bill and Melinda Gates Foundation sponsored a competition to discover a new toilet design that could be used in developing nations. When I teach, I often share this information. Now I’ve seen it in person.
Landscape Drought Damage- Repair and Replace
By Sarah Browning, UNL Extension Horticulture Educator
So, what can we do to repair last summer’s damage, and prevent additional problems this summer?
Assessing the Damage
We expect plants that are not well-adapted to Nebraska's dry, windy conditions to develop damage during drought. This includes plants such arborvitae, poorly sited yews, and broadleaf evergreens like holly. Arborvitae can become tolerant to average dry conditions 1) if they are planted in shade, and 2) once they are well established. Yews can tolerate normal dry conditions if they are located in afternoon shade. But last summer's drought was way beyond normal dryness, and many plants that did not receive supplemental irrigation have died.
Upcoming Gardening Webinars
Join us for an exciting Webinar series, Gardening At Lunch, right from your desk at work or home. This series includes eight informative one-hour sessions covering the topics of household insects, weed identification, fall gardening, pruning, tree hazard assessment, early spring vegetable gardening, tree diseases, and outdoor insects.
The cost of the series is $10.00 per program or $60.00 for the entire series, you must pre-register at http://marketplace.unl.edu/extension.
For more information contact Natalia Bjorklund in Dodge County at (402) 727-2775 or email nbjorklund3@unl.edu; or contact Nicole Stoner in Gage County at (402) 223-1384 or email nstoner2@unl.edu.
Now Available
NebGuide G2186
Stormwater Management: Disconnecting Downspouts and Impervious Surfaces
This NebGuide provides an overview of several methods to eliminate direct connections between downspouts and/or impervious surfaces and municipal storm drain systems to reduce the amount of stormwater runoff and pollutants that leave a property
Published by University of Nebraska–Lincoln Extension, Institute of Agriculture and Natural Resources
Check It Out
Harvesting Rain, April 2, 2013
Methods of rain harvesting include using rain barrels, cisterns, rain gardens and bioretention gardens. Kelly Feehan, UNL Extension Educator
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Musk Thistle in Drought, April 5, 2013
A series of studies on musk thistles shows weather can be a significant influence on this noxious weed. Steve Young, UNL Extension Weed Ecologist
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Spring Turf Care, March 14, 2013
Last summer was one of the driest on record and many lawns across Nebraska died during the drought. Zac Reicher, UNL Extension Turf Specialist.
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