Central Florida Landscapes ENEWS

April 2017

In This Issue...
Landscape U - Diagnosing Problems - Specialist & Industry Updates
Crape Myrtles Resistant to Powdery Mildew
Question of the Month - Yellowing Palm
Book Review: Ornamental Palm Horticulture
Upcoming Events...
... Diagnosing Problems - Specialist & Industry Updates

April 21, 2017
8:00 am-12:00 pm
CEUs Available!
Get the dirt on DIAGNOSING PROBLEMS with Specialist & Industry Updates  in this last class of our Landscape U series. CEUs Available!
To register, click here!
8:00 - 8:30 am - Registration
8:30 am - 9:20 am - Top Ten Ways to Improve Weed Control in Lawns and Ornamentals
9:20 am - 10:10 am - Using the UF/IFAS Extension Soil Testing Lab
10:10 am - 10:25 am - Break
10:25 am - 11:15 am - Update on Insect Management in Turf and Ornamentals
11:15 am - 12:05 PM - Diagnosing Nematode Problems

3 Commercial L&O, Ltd. L&O, Ltd. Commercial Landscape Maintenance, O&T, Private Ag, Right of Way

3 Certified Horticulture Professional

3.25 Certified Arborist, BCMA - Practice, Municipal Specialist, TW Climber Specialist
Crape Myrtles Resistant to Powdery Mildew

A key pest of crape myrtles that can be seen this time of year is powdery mildew. Powdery mildew (Erysiphe lagerstroemiae) is a fungus. This fungus grows on the surface of leaves, shoots, buds and flowers. Powdery mildew grows best on young, actively growing plant tissues. It may cover new growth entirely and cause severe damage. Older leaves are less likely to be affected but can become infected under conducive conditions for the disease. This disease has a powder-like appearance on the infected surface. Infected shoots may dry up and shrivel. Severely affected buds will abort and drop off. Badly infected leaves may grow abnormally (curl and twist). Severe infection may also cause premature defoliation. Warm days and cool nights (60° - 80°F) reportedly favor development and spread of powdery mildew.

The best management method is prevention. Plant crape myrtles in full sun, and use good cultural practices, such as avoiding excess fertilization. One way to avoid powdery mildew is to plant one of the cultivars bred and selected for resistance to powdery mildew.
The following cultivars are showing excellent or good resistance to powdery mildew:  Semi-dwarf (15 feet) - Acoma (white), Caddo (pink), Hope (blush-white), Pecos (pink) and Tonto (red).  Intermediate (up to 20 feet) - Apalachee (orange), Centennial Spirit (dark red), Christiana (deep red), Comanche (coral pink), Hopi (pink), Lipan (red-lavender), Near East (pink), Osage (pink), Osage Blush (pink), Sioux (pink) and Yuma (lavender).  Full tree (over 20 feet) - Basham's Party Pink (lavender pink), Biloxi (pink), Choctaw (pink), Fantasy (white), Kiowa (white), Miami (pink), Muskogee (lavender pink), Natchez (white), Townhouse (white), Tuscarora (coral pink), Tuskegee (pink), Twilight (dark purple) and Wichita (lavender).

More info here.
Question of the Month - Yellowing Palm
Q: Are you aware of any cases of Lethal Yellowing on robellini palms in Central Florida?
A: From Dr. Tim Broschat, Palm Specialist, UF/IFAS Extension
This is a chronic case of Fe deficiency.  It is possible that the yellow palm was planted a bit deeper than the other two in the clump.
Iron deficiency appears as interveinal or uniform chlorosis of the newest leaves. Older leaves remain green. In palms suffering from chronic Fe deficiency, the entire canopy may be chlorotic. In severely Fe-deficient palms, new leaflets may have necrotic tips, growth will be stunted and the meristem may eventually die.
Iron deficiency is usually not caused by a lack of Fe in the soil but rather by poor soil aeration or by planting palms too deeply. Both factors reduce root respiration and therefore active uptake of Fe. Root injury from root rot diseases will similarly be expressed above ground as Fe deficiency.
Iron deficiency is best prevented by planting palms no deeper than they were originally growing and by planting in a well-drained soil or site. Although treatment with Fe fertilizers can help Fe deficient palms recover, long-term recovery usually requires correction of the cultural  problem that caused it in the first place.
You can view the full publication on iron deficiency here  
Book Review: Ornamental Palm Horticulture
The second edition of Ornamental Palm Horticulture by Timothy K. Broschat, Alan W. Meerow and Monica L. Elliott is now in print from the University Press of Florida. With a wealth of colorful photos, this updated edition of the essential reference for growing palms contains new information on seed germination, fertilization, pests and diseases. Nowhere else has such comprehensive information on palm horticulture been brought together in one book. Cost is $39.95.
Click here to order.
Upcoming Events 
2017 Central Florida Pesticide Training & Testing Schedule -   Click here
First Thursday of every month at 8:30am - Commercial Pesticide Applicator License Testing at the UF/IFAS Extension Orange County. 8:30am-12:30pm. Pre-registration required. Must bring a valid picture ID and voucher. 
Obtain a voucher and register at: http://pesticideexam.ifas.ufl.edu
April 11 - Landscape U - Diagnosing Problems  at the UF/IFAS Extension Orange County, Orlando. 8:00am-12:00pm. CEUs Available!
Registration:  Click here

May 11 - Review & Exams Limited Certification Pesticide Applicator Licenses at the UF/IFAS Extension Osceola County, Kissimmee. 8:00am-3:00pm. CEUs Available!
Registration: Click here
Exam Application/Voucher Number:   Click here

May 18 - Review & Exams Aquatic/Right of Way/Natural Areas Pesticide Applicator Licenses at the UF/IFAS Extension Lake County, Tavares. 8:00am-4:00pm.
Registration: Click here
Exam Application/Voucher Number:  Click here

May 24 - Evidence-Based  Zoysiagrass Management Workshop at the UF/IFAS Extension Orange County, Orlando. 9:00am-4:00pm. CEUs Available!
Registration: Click here

June 1 - CEU Day & Worker Protection Standard/Train the Trainer at the UF/IFAS Extension Lake County, Tavares. 8:00am-4:00pm. CEUs Available!
Registration: Click here

June 15 - Green Industries Best Management Practices (GI-BMP)   at the UF/IFAS Extension Orange County, Orlando. 7:45am-4:00pm. CEUs Available!
Registration:  Click here

UF/IFAS Extension Orange County Classes & Events


Do you want to find out what other kinds of classes the UF/IFAS Extension Orange County has to offer? Click the logo below to see class schedules and up-to-date information on horticulture, agriculture, family & consumer sciences and 4-H.  Visit us to find Solutions for Your Life!


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  Until Next Time,
Celeste 2012 
Celeste White
Commercial Landscape Management
UF/IFAS  Extension  Orange County 
6021 S. Conway Rd
Orlando, FL 32812
Phn: 407-254-9210
Fax: 407-850-5125
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