Title: Citrus leaves
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00087049/00070
 Material Information
Title: Citrus leaves
Series Title: Citrus leaves
Physical Description: Serial
Creator: Citrus Research and Education Center, Institute of Food and Agricultural Sciences
Publisher: Citrus Research and Education Center
Publication Date: October 2006
 Record Information
Bibliographic ID: UF00087049
Volume ID: VID00070
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.


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Weed Management in Citrus
Oct. Lab Highlight Dr. Megh Singh

Dr. Harold W. Browning,
Center Director
UF/IFAS Citrus Research
and Education Center
700 Experiment Station Road
Lake Alfred, Florida
Phone: (863) 956-1151
Fax: (863) 956-4631





Phase I renovations of
the Ben Hill Griffin, Jr.
Citrus Hall are scheduled
for completion Nov. 29.

The following renovations
will be completed:

*the reworking of the
ceilings and roof; front
entrance renovations;
*the Library ceiling and
*Library renovations;
*Westentry/EM Lab corridor
new flooring, acoustical
grids, lighting and tile;
*Teaching lab area drywall
removal and replacement/

Phase II is scheduled to
begin after the first of the
year and will encompass:

(See BHG Renovations,
continued on page 2)

Weed control in Florida citrus accounts for approximately 20
to 28 percent of the total annual production cost for citrus
in Florida. Dr. Megh Singh, Professor of Horticulture, specializing in
weed management, has been conducting research programs both in the
laboratory and the field.
The main emphasis of the program is maximizing the efficiency of
weed control in citrus. "Currently our research area focuses on several
areas: the evaluation of new herbicides for weed control in citrus,
increasing the efficiency of existing (registered) herbicides, exploring
effective methods to reduce the herbicide leaching, studying herbicide
physiology in weeds (absorption, translocation, and metabolism),
investigating biological/ecological characteristics of weeds, evaluating
herbicide phytotoxicity affects on citrus, and herbicide resistance,"
Singh stated.
Studies on allelopathy of lantana and basil plants have also been
conducted which provided good information on the germination of
weeds. In published studies, allelopathic effects of several crops and
weeds havebeen attributedto the presence of phenolic compounds intheir

(See Weed Management, continued on page 3)

During August many important international
meetings were held, three if these were
particularly important to citrus science and
research. They were The International Society of
Horticultural Science (ISHS) Congress 2006; the 4th
Citrus Research International (CRI) Symposium; and
the II International Citriculture Meeting. CREC was
represented at each of these meetings by Drs. Gene
Albrigo, Fred Gmitter, and Pete Timmer.
Drs. Gmitter and Albrigo attended the
International Horticultural Congress, 2006, in Seoul,
South Korea. The Congress is held every four years
and provides an opportunity for horticulturists from
around the world to come together, learn more of
the research activities underway around the world,
and become more familiar with the horticultural
industries and traditions of the host country and
There were more than 2,000 participants registered
for the Congress this year, exceeding the organizers'
goals. There were six Colloquia and 16 Symposia


Dr. Megh Singh reviews the symptoms of a
new compound on plant in greenhouse.

organized, covering a wide range of topics. Gmitter
was responsible for organizing a Symposium titled
"Citrus and other Tropical and Subtropical Crops,"
with the assistance of Albrigo, and their colleagues,
Dr. Deng Xiuxin (People's Republic of China) and
Professor Doo-Kihl Moon (Korea).
Gmitter was also invited to deliver two
presentations /titled "Genomic Studies of Citrus
Canker Resistance in Fortunella and Citrus,"
and "Triploid Citrus Breeding by Interploid
Hybridization and Embryo Rescue."
Albrigo attended the Executive Committee
meeting prior to the ISHS Congress and was able
to visit with his former Ph.D. student, Yong Soo
Hwang, who has a postharvest handling program
on deciduous fruits as part of his program at
Chungnam National University in South Korea.
After the ISHS Congress, Albrigo was invited
to make a presentation on citrus production
in the U.S. during an international seminar on
(See International Meeting, continued on page 3)

Faculty Attends International Meetings


To complement the Lab Highlights featured over the
past few months, this column will focus on employees
who work in the labs, visiting scientists and students, and
many of the other "behind-the-scenes" members of the CREC

LAURA WALDO, SCHUMANN LAB: Laura has worked at
CREC since April 2004. She has
a B.S. in Horticultural Science
and is currently working on
her M.S. in Environmental
Science through the UF Distance
Education Program. Her work
in Dr. Arnold Schumann's lab
includes the BMP Verification
Study (more information can be
found at
bmp/index.htm), as well as
i. groundwater sampling from
Laura Waldo, "GO PACKERS!!" monitoring wells and lysimeters.
(photo by Gretchen Baut) Laura was born in Madison,
Wisconsin and is still a Packers'
fan. She is currently a resident of
Auburndale with her three "kids" (her pugs, Reggie and Lucy,
her kitty, Lilo). She enjoys kayaking, landscape design, visiting
family in Orlando, and Pug rescue.

DR. SHIV D. SHARMA, SINGH LAB: Dr. Sharma first
worked here from November 1998 until 2001 and just recently
returned to the Singh lab. Currently, his research in the Singh
lab is on weed management in citrus consisting of uptake
and translocation studies, greenhouse studies, laboratory
studies relating to
herbicide efficacy and
mode of action. He has
done allelopathy and
herbicide soil column
leaching studies.
"Recently, I attended a
training program at the
University of Tennessee
on determining and
identifying shikimate as
a factor of glyphosate
resistance in weeds," Dr. Shiv Sharma in forefront with Dr.
Tom Mueller (Univ. Tenn.). Photo courtsey
Sharma stated. of Dr. Sharma.
Dr. Sharma was
born in Haryana, India, is married and has two children.
His daughter, Neha (22 years old) lives in India and his
son, Diptesh (18 years old) is a student at UF in Gainesville
majoring in mechanical engineering. Sharma received both his
B.S. (Honors) in Agriculture and his M.S. in Agronomy from
Haryana Agricultural University in Hisar, India. He received
his Ph.D. in Weed Science from Starthclyde University in
Glsgow, Scotland. Sharma enjoys traveling, football games,
movies, and helping at home.

("BHG Renovations," continued from page 1)
*Front entrance and lobby/store front to the Library;
*Creation of the new media center;
*Meeting rooms;
*Replace various walls and doors throughout the building.

During Phase II, the BHG Hall will be off limits and
the end date will be announced at a later date.The
Ben Hill Griffin, Jr. Citrus Hall is a conference facility
that includes meeting rooms, a teaching laboratory, an
electron microscopy facility and the largest citrus library
in the world. For more information, please call Anita
Whitaker, ext. 1233.

By Christen Taylor, Program Assistant Precision Technology
and Mechanical Havesting

he 2006 annual American Society of Agricultural and
Biological Engineers (ASABE) International Meeting
was held in July at the Portland Convention Center, Portland,
Oregon. During the four-day event, Kyeonghwan Lee, who
has a doctorate in Biological and Agricultural Engineering,
received the first
place doctoral
Graduate Student
Research Award of
2006. The purpose
of the award is to
recognize excellence
in the conduct and
presentation of
research to build
the knowledge base
needed by engineers
who designers Dr. Kyeonghwan Lee (center) during award
hequment, f itesn, ceremony. Photo courtsey of Dr. Lee.
equipment, facilities,
and processes for the
sustainable operation of a biological system.
Lee is a postdoctoral associate for Dr. Reza Ehsani and
works with the automation of mechanical harvesting
machines. The award consisted of two competitions, one for
M.S. research and one for Ph.D. research, and is comprised
of two segments including a written research paper and an
oral presentation. Three finalists were selected on the basis of
their written papers and were invited for an oral presentation
at the ASABE International Meeting. The final contestants
were decided on the basis of combined performance in the
written paper and oral presentation. Lee topped the finalists
and was awarded a cash prize and plaque for his excellence at
the ASABE Awards Recognition Luncheon. His dissertation
was titled "A Dielectric Permittivity Sensor for Simultaneous
Measurement of Multiple Soil Properties." CREC is pleased
to congratulate Dr. Kyeonghwan.

Editor: Katherine Snyder, snyderkm@ufl.edu, ext. 1403;
Public Relations Coordinator: Anita Whitaker, atwhit@ufl.edu, ext. 1233.

("Weed Management," continued from page 1)

Sp residues. "Phenolic
compounds found in
decaying rye residues
were phytotoxic to
the germination of
lettuce seed. It has
been reported that a
S living cover crop of
spring-planted rye
reduced early-season
Dr. Shiv Sharma works with a Sample Biological
oxidizer This equipment combusts the plant biomass of common
samples treated with 14C herbicide. lambsquarters,
common ragweed, and
large crabgrass," Singh said.
The total estimated annual weed management cost to the Florida's
citrus industry during the last year was approximately $115 per acre;
therefore, it is very important to have the latest tools and techniques
available for the industry "Even a small improvement of 10-15 percent
reduces the cost of production by $11.50 to $17 per acre to the industry,
which is very significant," Singh said.
The major thrust of Singh's research program has been to reduce the
rate of application of both pre- and post-emergence herbicides. Use of
adjuvants has been a very successful approach as he has significantly
reduced applications in the last 16 years. This approach has also been
successful in reducing the environmental loading of herbicides.
However, there are concerns about the impact of continuous use
of glyphosate as some weed species have evolved resistance under
horticulture and other cropping systems. Work has been initiated in this
direction to avoid the onset of resistant weed species in citrus groves.
This work is currently underway in collaboration with Professor Tom
Mueller, University of Tennessee.
"Our greenhouse experimental facilities are state of the art, with the
use of a chamber track sprayer. This sprayer helps in precise application
of herbicide solutions on the plants grown for greenhouse experiments.
This facility contributes a lot towards our research program for the
citrus industry,"
Singh explained.
"We have expertise in
conducting herbicide
distribution studies.
For such studies, we
have biological oxidizer
equipment which
helps us to understand Gary Test stands with Chamber Track Sprayer A
distribution the pattern state-of-the-art facility for precision spraying of plants
for greenhouse experiments.
of herbicide using
radiolabelled chemicals."
Currently, Dr. Shiv D. Sharma is working as a Postdoctoral Research
Associate, specializing in herbicide physiology in weeds (absorption
and translocation and metabolism). In June 2006, Sharma attended a
training program in the University of Tennessee on determining and
identifying an important trait to understand resistance development
in weeds. Also working in the Singh lab is Gary Test, Sr. Laboratory
Technician. "He is of great assistance in conducting laboratory,
greenhouse, and field studies on the different aspects of weed
management," Sharma said.
(Thank you to F : i' P and Mr. Test forcontributing to this article. )

("Internatinal Meeting," continued from page 1)

Dr. Gene Albrigo

Dr. Fred Gmitter

Ur. Fete simmer

"Trends in Citrus Industries '17
Research," held in Jeju City, Jeju
Island. The island is the major
mandarin production area in
South Korea with most production
in greenhouses.
Following the ISHS Congress,
Drs. Gmitter and Timmer were
also invited to deliver plenary
talks to the 4th Citrus Research
International (CRI) Symposium,
also held during August, in Port
Elizabeth, South Africa.
"This was the first time CRI
invited foreign experts to deliver
plenary talks, and it may have been
of value as the attendance
at the meeting this year
was the highest number
ever," Gmiter stated.
Gmitter presented
information on the citrus
scion breeding work
that the CREC plant
improvement team
conducts in the area
of citrus scion cultivar
development. Timmer
gave the opening talk to
the Symposium on citrus
canker, greening, and
other diseases threatening
citrus in both Florida and
South Africa.
After the meeting,
facilities, accompanied
by Dr. Graham Barry, a
former CREC graduate
student who earned his
Ph.D. degree a few years
ago under Dr. Bill Castle's
Following the CRI
Symposium, Timmer and
his wife, Nancy, spent a few
days vacationing (birding)
with Lise Korsten of the

University of Pretoria and her family.
Timmer then traveled to S5o Paulo, Brazil and presented an
invited lecture in Cordeiropolis on Alternaria and scab diseases at
the II International Citriculture Meeting sponsored by Improcrop.
He also met with Renato Reis, who is finishing his doctoral degree
at Sao Paulo State University to discuss progress on his research
on Alternaria brown spot. Timmer is a member of Reis's Ph.D.
(Thank you toDrs. G I .' red Gmitter, and Pete Timmer for contributing to
this article. Faculty photos by Gretchen Baut.)



As fresh as it gets! Grosser/Browning, Garnsey, and McCoy parties join up
for a walleye shore lunch.





During August, Sachindra Congratulations to Richard Flynn, husband of Karla Flynn
Mondal, postdoc for Dr. Pete (Word Processing). Richard, employed by The Martin-Brower
Timmer, was invited to present Company, Kissimmee, Fla.,
collaborative research on greasy competed in the 2006 Food
spot and melanose. Mondal Industry Truck Driving
1/ worked with Dr. J. W. Hyun, Championship Sept. 15-17
National Jeju Agricultural and took second place in the
Experiment Station, Korea, 48-foot tractor trailer class
during his week-long visit. Dr. out of 110 drivers. This is
Hyunis Dr. Timmer's counterpart a best-in-class competition
a t in a cooperative research project that focuses on driver skills
Mondal visits a Budda at a mountain and was Mondal's host scientist and safe driving in the food
during his visit. Dr. Hyun has industry. Richard received
visited CREC three times in the past. "Jeju is an island in Korea and is a $750, a medallion, and a
good place for citrus production," Mondal said. crystal trophy.

After graduating from Gianluigi "GG"
high school, Bill Futch, Votino, is a visiting
the son of Dr. Steve and Ph.D. student from
Deborah Futch, was given the University of
.., the opportunity to choose Palermo, Italy He
any destination in the has joined Dr. Jim
world as a gift. Bill chose Syvertsen's lab
an African hunting trip the for six months to
family took in June. Bill work on drought
was successful in obtaining stress physiology
several trophies, including of citrus and lives Gianluigi "GG" Votino
this kudu which was a in Lake Alfred. GG
record trophy Bill recently earned his B.S. and M.S. from the University of
graduated from Winter lermo major
Pictured from left to right: Dr. Steve, David, Bill, and Deborah Haven High School and is Palermo majoring in Crop Production and Pest
Futch. attending Polk Community Management, and specializing in Tree Fruits of
College. Temperate and Mediterranean Regions.


In June, Drs. Harold
Browning and Jude Grosser
traveled to Lake Stanzikimi
in Northwestern Ontario for
a week of fishing. Enjoying
the Canadian fishing during
the same week were Drs. Clay
McCoy and Steve Garnsey.
All three parties joined up
for a shore lunch, sharing not
only their catch but fish stories Browning shows off a fat Canadian wall-
as well.



9 ....
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16 IN~iiiii~iil~it~. jii~~



1 2 Time 3 4 5 6 7
Production Mgr. Mtg. Faculty Meeting UF

8 9 10 11 12 PayDay 13 14

15 16 17 Reporting 18 19 20 21
Processor's Day

22 23 24 25 26 PayDay 27 28

Sarasota Master

29 30 31
Time Reporting

CRE Foundation Pay Day

O\~ Af1 d {P

c.CL. t rrouuctLon ivlgr. Ivltg., IvIarK LeDouliS,
Rm. 2-4, BHG, 9 a.m. 3 p.m.
Oct. 5 Faculty Mtg., Dr. H. W. Browning,
Employee Breakroom, Bldg. 7124, 8:30 a.m. -
10:30 a.m.
Oct. 17- Certified Crop Advisers, Dr. Tom
Obreza, Rm. 2-4, BHG, 7 a.m. 6 p.m.
Oct. 18 Processor's Day, Dr. Renee
Goodrich, Rm. 2-4, BHG, 8 a.m. 5 p.m.
Oct. 27 Sarasota Master Gardeners, Dr.
Steve Futch, Packinghouse Conf. Rm., 9:30
a.m. Noon.
Nov 6 CRE Foundation Mtg., Dr. H.W.
Browning, Rm. 3-4, BHG, 10 a.m. 2 p.m.
Nov. 10 HOLIDAY-Veterans' Day Observed


Due to the unpredictable nature of
the remodeling of BHG, restrictions
for the usage of BHG meeting room for
new events and meetings are in effect.
These restrictions will remain in effect
until conditions of the meeting rooms and
conference room can be evaluated.
Effective immediately, the primary
rooms available will be the Packinghouse
Conference Room, the Employee Breakroom
(Bldg. 7124), and Room 12 Conference Room.
As a result, there is the likely chance there
will be a shortage of meeting room space.
Please plan ahead and reserve rooms as far
in advance as possible.

Lalendar Updates and hlanges
can be seen on the web at
httIp: tUw .crec.ait..utl.edu net.d
Next Month's Deadline is
Oct. 18, 2006


Attention: Kathy Snyder
700 Experiment Station Road
Lake Alfred, FL 33850


S..T..RDAY. ...
-r~i"'iliiiii~"i;'L 4 ~

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