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Prevent Problems with Leyland Cypress
Cankers are infected wounds on limbs and branches that may ooze infectious sap.
Bot canker kills individual branches in the tree. The foliage may turn grey-green before it dies. The dead branch will have darker bark and will have a sunken canker where the dead part of the branch begins.
Limbs infected with Seiridium canker turn yellowish and then brown to grey when they die. Limbs often die back from the tips. The cankers on the main stem are sunken, reddish and ooze sap profusely. There can be many cankers on a limb.
There is no spray to control these diseases. These diseases enter wounds and are worse during stressful conditions. The main control is to keep the plant in good health so it can resist these diseases.
Dry weather and improper watering can be big factors in the spread of these diseases. Plants with roots that get too wet or too dry are more likely to get these canker diseases.
Prevent disease problems with proper site selection and care
Water plants deeply once every 7 – 14 days during drought. Wet soils to a depth of twelve to eighteen inches when watering. This will probably require one inch of water if you use sprinklers. Put a pie pan or tuna can under the sprinkler and turn it on. Time the sprinkler to see how long it takes to apply one inch of water. Water this long each time. Soils must dry out between watering or roots may die. Avoid wetting the leaves and limbs when you water.
Soaker hoses are better because they keep the foliage dry, which may reduce disease problems. Run soaker hoses once every 7 - 14 days in dry weather. Turn them on just long enough to wet the soil twelve to eighteen inches deep.
Plant
Do not plant
Do not plant
If your Leyland
First cut out the dead limbs. Be very careful to cut way back into good live tissue. Cutting diseased limbs and then good limbs may spread the disease. While pruning you can periodically clean your shears with a towel dipped into rubbing alcohol. We generally do not cut the main stem on a
Finally, use the information mentioned earlier to find out what needs to change about the way we are growing the plant. The main problem is often improper watering. Solving tree problems often comes down to watering and root care since there is generally little else we can do for trees.
Other issues with
All
Consider these issues when you plant
Avoid plants like
Possible alternatives to
See this publication for details on size, growth rate, site preferences, etc. of some of these -
http://pubs.caes.uga.edu/caespubs/pubcd/B625/B625.htm
‘Green Giant’ Thuja ‘Foster’s’ holly
‘Little Gem’ magnolia ‘Bracken’s Brown Beauty’ magnolia
Lusterleaf holly ‘Nellie R. Stevens’ holly
Osmanthus (tea olive) Eastern red cedar (good option but growth rate can be slow)

Kevin Ong, Texas AgriLife Extension Service, Bugwood.org
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Educational Services for the Turf & Landscape Industry
UGA Extension ‘extends’ the university’s educational resources to offer lifelong learning to the people of Georgia through unbiased, research-based education in agriculture, the environment, communities, youth and families. These resources are available to the landscape, turf & nursery industry in many ways.
Contact your Local Extension Office!
Locate your local UGA Extension Office – http://www.caes.uga.edu/extension/statewide.cfm
Call your local UGA Extension Office – (800) ASK-UGA1 from any non-mobile phone.
Online Landscape Information
Find more than 250 factsheets at http://www.gaurbanag.org/
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Search UGA Extension publications at www.caes.uga.edu/publications/
The Landscape Alert educates the
Online safety videos (www.ugaurbanag.com) and other videos (http://tinyurl.com/7nnqqv) make a great 'rainy day' or 'any day' training.
Super Crew Video Series
The SuperCrew video series brings professional training to your location at your convenience. It was developed in cooperation with industry leaders and endorsed by professional organizations. Each DVD training is narrated in both English and Spanish and includes discussion questions and multiple-choice exams in each language. To order or for more information - http://www.supercrew.caes.uga.edu/
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Topics include:
Being Safe with Grounds Equipment Installation and Establishment of Turfgrasses
Annual Bed Preparation and Installation Planting Procedures for Woody Ornamentals
Employee's Role in Landscape Problem Solving Introduction to Pesticide Safety
Quality Landscape Management: The Employee's Role
Job Safety for the Professional Landscape Employee
Making Every Drop Count: The Employee's Role in Water Conservation
Hispanic Training
OSHA "Safety Makes Sense" Online Video Series, presented by the
Purchase bilingual Super Crew videos - http://www.supercrew.caes.uga.edu/
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For information on in-person/on- site training, contact Karen Atkins – atkinsk@uga.edu, (478) 987-2028.
There are approximately 8,000 horticultural related businesses in
UGA
UGA Extension produces an annual Pest Management Handbook. The handbook has many uses for pesticide applicators. It includes:
- Pesticide recommendations for most major pests and crops. This can include pesticide rates, recommendations on application, post harvest or re-entry interval and other information.
- Pesticide handling and safety information.
The
The 2009 Turfgrass Pest Control Recommendations for Professionals will soon be returning from the printers. The Georgia Turfgrass Association (GTA) has footed the bill for publishing these recommendations. I hope agents will have these free guides to Turf pesticides within the month. The publication is available online now at www.GeorgiaTurf.com.
Soil Testing
Standard soil samples will tell you how to lime and fertilize plants for best growth. Cost ranges from $6.00 to about $10.00. Bring samples to your local Extension Office. For more information see this website http://pubs.caes.uga.edu/caespubs/pubcd/C896/C896.htm
You can also order soil testing kits that allow you to submit samples through the mail. The $15 kit includes sampling instructions, a soil sample bag and pre-paid mailer. Visit www.soiltest123.com
Specialized analyses are available for greenhouse or nursery media and other soils. Cost for these special samples varies with the sample.
Nematode assays identify the presence, numbers and type of nematodes in the soil around the roots of the plant. Assays are free if we are troubleshooting or $25 for routine samples.
Pesticide and Chemical analyses cost more ($50-$100 or more) and are available but are usually not necessary to diagnose most problems. Consider other factors first.
Water & Media Sampling
Water samples are very useful for greenhouse & nursery operators since many fertilizers are applied via irrigation. Water quality can greatly affect the nutrition and health of greenhouse and some nursery crops. Water sampling is one of the first steps to a good fertility program in greenhouse crops. For more information go to – http://pubs.caes.uga.edu/caespubs/pubs/PDF/B1256.pdf. Water and media sampling can help supply proper information for making the best decisions in producing plants and preventing and solving problems.
Plant, Insect and Disease Samples
Many problems can be diagnosed over the phone, by email or by bringing a sample to the Extension office. There may be a charge for some samples.
Online Weather Data
Weather stations across
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