T UNIVERSITY of
Volume 14, Number 4
New Greenhouse Agent
Production Times is brought to
Juanita Popenoe, Ph.D.
Lelan Parker, M.S.
This material is provided as one of the many
services relating to the educational programs
offered to you by this agency. Our statewide
network of specialists is prepared to provide
current information on agriculture, marketing,
family and consumer sciences, 4-H, marine
science, and related fields. We will be happy to
help you with additional information upon
Use of trade names in this newsletter does not
reflect endorsement of the product by the
University of Florida, Institute of Food and
Agricultural Sciences, or the Florida Coopera-
tive Extension Service.
Lelan Parker is the new Com-
mercial Horticulture Agent for
Nursery and Greenhouse Pro-
duction for Orange, Lake and
Seminole Counties. She is a na-
tive of Baton Rouge, Louisiana,
receiving her B. S. degree at
Southern University Agricultural
& Mechanical College in Agri-
culture with a concentration in
Plant Sciences. She attended
Florida Agricultural and Me-
chanical University for graduate
school and obtained a M. S. de-
gree in Agricultural Sciences
with a concentration in Plant Sci-
in April of this year. Her thesis
was entitled: "Pedigree Analysis
of 'Cynthiana' and 'Norton'
Grape by DNA Microsatellite
Some of her highest achieve-
ments include maintaining
Dean's List status for both uni-
versities attended, 2002-2003
Collegiate All American Scholar,
and 2006 Florida A&M Univer-
sity, College of Engineering Sci-
ences, Technology, and Agricul-
ture Most Outstanding Graduate
Student Leadership Award just
to name a few. She has authored
and co-authored publications in
the Florida State Horticultural
Society Proceedings and Journal
International des Sciences de la
(Continued on page 4)
Whitefly Alert-if you find whiteflies on a shipment, pay attention to the whitefly control program at
http://mrec.ifas.ufl.edu/LSO/bemisia/bemisia.htm and let extension know where they are coming from. Re-
sistant whiteflies have recently been found on hibiscus and poinsettia coming from some major propaga-
tors. They are not so much of a problem up north where they can be killed off in the winter, but down south
here, all year long is great.
The Institute of Food and Agricultural Science (IFAS) is an Equal Employment Opportunity Institution authorized to provide research, educational information and other services only to individuals and
institutions that function without regard to race, color, sex, age, handicap or national origin U S DEPARTMENT OF AGRICULTURE, FLORIDA COOPERATIVE EXTENSION SERVICE, UNIVERSITY
OF FLORIDA, IFAS, FLORIDA A & M UNIVERSITY COOPERATIVE EXTENSION PROGRAM, AND BOARDS OF COUNTY COMMISSIONERS COOPERATING
Palm Disease Update
By Monica Elliot
It has been a busy year at the Fort Lauderdale
Research and Education Center for palm dis-
eases. We have observed one new disease in Flor-
ida, expansion of the geographic range within
Florida for another disease, and expansion of the
palm host range for two more diseases.
First, if you have not been to the FLREC web site
in awhile, it has been updated
(http://flrec.ifas.ufl.edu/). On the left side of the
front page is listed the various specialties of the
Center, including "Plant Pathology." Links to
EDIS publications on palm diseases can be found
here, as well as any updates that have not yet
been placed into EDIS format (such as those be-
The first new update concerns palm diseases
caused by phytoplasmas. The geographic range
of Lethal Yellowing (LY) has expanded north-
ward, and a phytoplasma disease called Texas
Phoenix palm decline (TPD) has finally arrived
photo at left is
nix palm de-
be normal for
the spear leaf
(youngest leaf that has not unfolded) is tan and
not green. Information about LY and TPD are at:
The second new update concerns the "new"
queen palm disease, which I am tentatively call-
ing "Fusarium Decline" as Fusarium oxysporum
appears to be the pathogen. More importantly,
the host range appears to be expanding as Mexi-
can fan palms (Washingtonia robusta) in three geo-
graphically distinct counties have developed this
disease. Information about "Fusarium Decline of
Queen Palms and Mexican Fan Palms in Florida"
Above, Queen palm with Fusarium in which all
leaves have died in show above. Note that palm
looks "freeze dried in place."
Next page, a Mexican fan palm with Fusarium.
Note the brown stripe on the petiole of the af-
(Continued on page 3)
(Continuedfrom page 2)
Finally, the list of palms affected by Petiole
(Rachis) Blight, specifically those caused by the
fungus Serenomyces, continues to expand, with a
Thrinax species recently added to the list. (see
http://edis.ifas.ufl.edu/PP145 for more details).
To the right is the petiole and a leaf of a Mexican
fan palm with Petiole Blight. This looks similar
to Fusarium, but only affects indi-
vidual leaves, and rarely kills the palm, but will
move up through the canopy from oldest to
younger leaves if not controlled. The damage to
the leaf is caused by the death of the water con-
ducting elements in the petiole. A pathologist
needs to determine which pathogen is causing
SWebsites to Check Out
* Find out about the latest Entomology and
Nematology publications for sale at:
http://pests.ifas.ufl.edu/forsale/. They have
CD Rom databases of beneficial and pest ar-
thropods of Southeastern US Woody Orna-
mentals and many more.
* A "Best of the Bugs" list of websites is avail-
able at http://pests.ifas.ufl.edu/bestbugs/. The
sites listed here are judged to be in the top 5%
of insect- or nematode-related WWW sites by
a committee of professional entomologists and
* Are you a member of the Florida State Horti-
culture Society? You may want to join to share
information about Florida's unique horticul-
ture.. Their newsletter can be seen at http://
* Remember our website http://
cfextension.ifas.ufl.edu. We have production
guides with key plants/key pests (color photos
included), plant clinic results (photos and di-
agnoses), a calendar of local events, and much
(Continuedfrom page 1) the U.F./IFAS extension team and looks forward
Vigne et du Vin. to meeting growers and exploring the exciting
In her spare time she enjoys traveling, reading, world of extension!
spending time with friends and family and learn-
ing more about plants. She is happy to be aboard
Plant Clinic Problem of the Month Erwinia soft rot is caused by bacteria that are
spread on contaminated tools, soil, workers and in water. The water-soaked spots on the leaves usu-
ally have a rotten fishy smell to them and will enlarge to rot the whole plant. It is especially bad dur-
ing warm humid conditions of summer or in poorly ventilated greenhouses in the winter. Infected
plants and symptomatic leaves should be removed at once. Tools and
benches between plantings should be cleaned with surface disinfec-
tants like bleach or quaternary ammonium compounds. Lower hu-
midity levels by increasing ventilation and spacing between plants
and reducing watering. Copper containing fungicides may help to
reduce the spread of the bacteria, but cannot cure infected plants.
2007 Planning Calendar
Links to most programs and agendas may be found at: http//cfextension.ifas.ufl.edu or the UF Extension Calendar at http]/
16-Employee Verification Program, Tavares. 9-11 am. Contact Maggie Jarrell (352) 343-4101.
24-Farm Safety Day, Tavares. 9 am. Contact Maggie Jarrell (352) 343-4101.
28 31-International Plant Propagators' Society Southern Region Annual Meeting Chattanooga, TN. http://
8-Pesticide Applicator CEU Day, Kissimmee. Contact Jennifer Welshans (321) 697-3000.
27-Nursery and Landscape IPM Scout Training, MREC Apopka. Contact Yamira Donato (407) 254-9200..
29, 30-Great Southern Tree Conference. http://www.fngla.org/gstree/gen-info.asp
4, 11- Nursery and Landscape IPM Scout Training continued, MREC Apopka.
11-FAWN Update and Winter Weather Protection, Tavares. Contact Maggie Jarrell (352) 343-4101.
12-Private Applicator Review & Exam, Tavares. Contact Maggie Jarrell (352) 343-4101.