Dr. L. \V "Pete" Timmer
Receives CREC Distinguished
Dr. Harold W Browning,
UF/IFAS Citrus Research
and Education Center
700 Experiment Station Rd
Lake Alfred, FL
Tel. (863) 956-1151
Fax (863) 956-4631
Citrus Leaves is the monthly
newsletter for employees
and friends of CREC.
Citrus Leaves welcomes
your contributions, sugges-
tions, and corrections.
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ufl.edu, ext. 1403; Photog-
bution: Word Processing,
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submitted for publication
go to: http://www.crec.ifas.ufl.
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The CREC is fortunate in having a program to
recognize members of our faculty who have
achieved significant accomplishment during their
careers. Recently, Dr. Pete Timmer, Professor of Plant
Pathology, was selected as the second recipient of the
Citrus Research and Education Center Distinguished
Professorship. This endowed award is offered to a
CREC faculty member in recognition of sustained
outstanding performance and contribution. Dr.
Timmer was nominated by peers and was selected
for his career-long contributions to citrus pathology
in research as well as his leadership role in providing
timely information on citrus diseases and their
management through extension to citrus growers in
Florida and throughout the world.
Dr. and Mrs. Pete Timmer
photo by Jan Syvertsen
CREC 2005 FSHS Best Paper Awards
Best Paper Awards for the 2005 Florida State Horticultural Society Proceedings were received by
authors from CREC. The awards were from the Citrus Section and Handling and Processing Section.
For the Citrus Section: Diane B. Bright, James H. Graham, Michael S. Irey, and Leslie E. Baucum for
their paper entitled "Soil, rootstock, and climatic factors affect populations of Phytophthora nicotianae in
South Florida citrus plantings," Proc. Fla. State Hort. Soc. 117:148-151. For the Handling and Processing
Section: Fernando Alferez, Jacqueline K. Burns, and Lorenzo Zacarias for their paper entitled "Postharvest
peel pitting in citrus is induced by changes in relative humidity," Proc. Fla. State Hort. Soc. 117:355-358.
Congratulations to all the winners.
Lab Highlight July 2006
Dr. Herb Nigg's Lab
T his month's lab highlight visits with Dr. Herb Nigg, Professor
of Entomology. Working in the lab with Dr. Nigg are Rhonda
Schumann (Senior Chemist), Jeannette Barnes, and Ben Carter. This
laboratory currently has projects on two insects, Diaprepes abbreviatus and
Anastrepha suspense (Caribbean fruit fly).
Diaprepes' larvae feed on the roots of citrus, cutting production.
Caribbean fruit fly lays its eggs in citrus, particularly grapefruit, and the
larvae (maggots) burrow into and feed on the flesh of the fruit. Both
insects are quarantine pests. Florida ornamental nurseries must treat for
Diaprepes before shipping plants out of Florida. Florida grapefruit growers
participate in a Caribbean fly free zone certification program in order to
export fruit to Japan and citrus-growing, western U.S. states.
Nigg's research on Diaprepes has been focused on distribution and
movement, field monitoring methods, resistant rootstocks, pesticide
toxicity, and genetic differentiation of populations. In addition, the lab has
photo by Gretchen Baut
(cont. from page 1 Timmer Award)
Pete has been an exceptionally innovative and effective
researcher of numerous pathogens of citrus. He has published on
and made major contributions to our knowledge for no less than 9
disease systems, some of which include systemic diseases such as
citrus psorosis virus and citrus blight; Phytophthora a soil-borne
disease; foliage and fruit diseases that include postbloom fruit drop,
Alternaria, greasy spot, scab-melanose, and canker. "Very soon
after my arrival at CREC, I had the opportunity to collaborate with
Pete in research on Blight, Phytophthora, and Mycorrhizas. I am
privileged to be a very small part of Pete's mountain of contributions
in citrus pathology," stated Dr. James Graham, Professor of Soil
Microbiology at CREC.
In recent years, Pete accepted increased responsibility for
extension. He assumed a major role in the improvement and
publication of the Citrus PestManagementGuide over the last several
years. For years, he has presented many talks at extension meetings,
maintained a webpage
of useful information
for the industry, and
had a hotline with
frequent updates of
Recently, he has been
active in development
and delivery of
information on canker
and greening disease.
Peres (left) and Timmer (right) discuss and examine Pete's knowledge
citrus for diseases. of citrus diseases
is widely sought
after by international colleagues and students through research
collaborations, training programs, and research program
evaluations. One former student and now Assistant Professor at
Gulf Coast REC Balm, Dr. Natalia Peres, expressed, "In a few
words, I would say that Pete is the example that I've set for my
career but I will be already happy if I accomplish 1/10 of what he
has accomplished. He is not only an extraordinary professional but
a wonderful person, truly an example to be followed."
For the Florida citrus industry, Pete's research and extension
programs are strategically interwoven. His career is an excellent
example of how a plant pathologist with a research/extension
appointment should function. His research is oriented toward
problem-solving and development of practical information that
is immediately useful to the citrus industry. Pete has authored
over 300 reports in scientific journals, extension fact sheets, trade
magazines, and book chapters.
He is editor of the Citrus Pest Management Guide, and is
lead editor for American Phytopathology Society publications
on citrus diseases and their management. Pete has been active
on the editorial board of Phytopathology and Plant Disease. He
has served on international boards dealing with tropical plant
pathology and exotic pathogen regulation. He has actively served
the profession of plant pathology at CREC and department in
Gainesville serving as President of the Florida Phytopathological
Society. In recognition of his excellence in research and extension
and service to Plant Pathology, Dr. Timmer was honored as an APS
Fellow in 2000. Pete also has demonstrated administrative prowess
by serving as Assistant Director of CREC from 1991-93 and
has been instrumental in oversight responsibility for the CREC
For his innovative research contributions, his leadership in
citrus pathology extension, and his service to CREC and Florida
citrus industry, we recognize Pete Timmer as a Citrus Research
and Education Center Distinguished Professor.
(cont. from page 1 Nigg Lab Highlight)
determined the efficiency of the Tedder's trap and developed a
more effective trap for Diaprepes adults, as well as providing an
accurate method for monitoring the abundance of Diaprepes
larvae in the field.
"We also provided the first long-term data on a tolerant
and commercially available rootstock for Diaprepes as well
as leads for pesticide control of adult beetles," stated Nigg.
"We have developed three genetic methods to differentiate
populations of Diaprepes. These have been used to indicate
three introductions of Diaprepes into Florida, most likely from
the Dominican Republic and Puerto Rico," Nigg continued,
"We have also determined that the genetic profile of Diaprepes
introductions into California match those from the Dominican
Republic. Genetic work is proceeding with analyses of
Diaprepes adults collected from Caribbean island nations."
Dr. Nigg's lab has been involved in Caribbean fruit fly
research for 15 years and have provided data for baits and
pesticides for this quarantine pest. "Our current research is on
the consumption of various bait materials by this fly with the
goal of increasing consumption thereby enabling a reduction of
pesticide quantity in the bait," explains Nigg.
Continuing, Nigg states "To achieve this goal, we have
developed a new and innovative method to measure the
consumption of an individual fly. We can, in fact, measure the
consumption of two different materials by the same individual
fly. This allows the simultaneous presentation and consumption
comparison of two materials."
The lab team's research has determined that 6.8% sucrose
or fructose is preferred by A. suspense and current baits
contain either no sugar or about 14% sugar. They have
also discovered that the bait used for Caribbean fruit fly
management is consumed at a very low level. The consumption
of the commercial bait cannot be improved by adding sucrose,
suggesting a fundamental imperfection in the bait as Nigg's
team continues to investigate the consumption of proteins,
amino acids, and salts by this fly.
The Caribbean fruit fly free zone uses a malathion-bait
combination that is 20% malathion (200,000 ppm). Nigg
explains, "We have determined that 100 ppm of malathion
can achieve the same mortality as 200,000 ppm malathion.
Unfortunately, we have discovered that about 10% of male
and female flies are resistant to either 100 ppm or 200,000 ppm
malathion. We also discovered that under certain circumstances
that malathion is not the compound causing mortality, that
smaller, more toxic compounds associated with formulated
malathion do the killing, and we have identified suspect
compounds using gas chromatography-mass spectrometry."
with Marcia Alden
Library Sessions on Using
Library sessions are being conducted
on the use of library resources. The three
sessions include searching the UF Library
Catalog for books, journals and other
Material, accessing online journals, and
using Interlibrary Loan.
The UF Library Catalog online is the
key tool for answering the questions, "Does CREC have this book?"
and "Does CREC have this journal?" Whether you know the exact
information for the book or just "bits & pieces," the online catalog
will help you find the item here at CREC or any of the other libraries
within the University of Florida. An online tutorial is available at
help you learn more about the catalog.
If a print journal isn't available at CREC, there's a good chance
that a recent issue might be available online. The online library
catalog can also be used for searching and linking to online journals.
In the catalog, the online journals are listed along with the print
journals, if access is available. The link to the journal displays only
the years available online through UE Online journals are also
accessible through E-Journals but ONLY electronic journals are
When all else fails, if CREC doesn't have the book or journal, and
it's not available electronically, then the material can be requested
through Interlibrary Loan, or "ILL." Each person should have their
own ILL account to request articles or books from main campus or
These are just a few of the resources available to us from UE
Click this link http://www.uflib.ufl.edu/distance/ifas.html to view
some of the resources for IFAS Off-campus.
The CREC Public Relations Dept. had the opportunity
to share a booth with the Central Florida Development
Council, at the Institute of Food Technologies Annual Meeting
and Food Expo in Orlando, June 25-27. Kathy Snyder helped man
the booth with several other members of the Development Council
during the 3-day event. Many students, some in their senior year
in high school and those in undergraduate programs, stopped by the
booth asking for information on UF/IFAS Food Sciences programs.
Most of the student interests were in food safety programs.
In addition to students, Dean Mark McLellan stopped by the
booth on Monday, extremely pleased at UF/IFAS' presence at the
Food Expo. One of the items that CREC had for the taking was
a Directory of Presenters from IFAS (approximately 25 posters,
12 formal lectures, 2 oral presentations, and 1 workshop). Drs.
Russ Rouseff, Renee Goodrich, and Jose Reyes from CREC were
participants in the various presentations.
Several teachers from both middle school and high school (from
Panama City to Miami) were interested in receiving materials about
the research programs and tours offered here at the Center. Kathy
was able to give contact information from the IFAS directory for
those seeking information not only from CREC but those from
other Centers and Gainesville.
Business Office News
Sy now you've probably met Cheryl
LPetersen (ext. 1221), the newest
member of the Business Office, if you
haven't, stop by and introduce yourself.
iheryl joined the Business Office on
Nai 19 and handles all travel (except
for travel charged to SHARE) and basic
photo by Gretchen Bout
PC purchases (Cardholder last names
beginning with N-Z). For all other
accounts payable and PC purchases (Cardholder last names
beginning with A-M) please contact Lorraine Jones (ext. 1320).
For all SHARE travel and PO requisitions, contact Meredith
Pretzie (ext. 1214) and of course, for all budget questions
please contact Alta Church (ext. 1316).
For any other questions, please contact Jill McDonald at
Huanglongbing (Citrus Greening):
First Grower Training
She first grower
course for HLB or citrus
greening was held in
Immokalee, June 21,
2006. Attendees included
managers, and company
inspectors. Also in
attendance were three
Participants were able to see HLB high suspect visiting scientists from
plant samples in the classroom. the Hawaii Department
of Agriculture. The
workshop included a one hour classroom session, taught by Holly
Chamberlain, UF/IFAS CREC and Dr. Susan Halbert, FDACS-
DPI. Participants were able to view previously collected HLB
suspects and learned the proper procedures for submitting high
suspect samples to DPI for PCR confirmation. After the classroom
training, participants were transported to a known HLB-infected
grove for further 'hands-on' learning. Two sessions were held,
morning and afternoon, in both English and Spanish with a total
of 72 attendees. The program was successfully coordinated with
the assistance of regulatory
Matt Brodie, FDACS-DPI
and Tim Riley, USDA-
APHIS. Feedback for the
program was very positive
and requests for more
field ID training for citrus
inspections have been
Sb Participants received an on-site grove ID
received, training after classroom training.
CREC EMPLOYEE NEWS
Dr. Hala Chaoui, OPS, Ehsani
Dr. Hesham A. El-Shamy, Visiting Scientist,
Mr. Dharmendra Saraswat, Postdoc, Ehsani
Cheryl Petersen, Business Office, McDonald
Kelly Cook, OPS, Syvertsen
Carolina Emanuels, OPS, Rouseff
Rosalia Garcia-Torres, Student, Reyes
Naresh Pai, Student, Salyani
Mr. Hasguang Meng OPS, Orbovic
Jenna Waters, OPS, Grosser
Patrick Baker, OPS, Graham
Levette Rucks, OPS, Graham
Melinda Grosser, OPS, Graham
Xiao Zhang, OPS, Timmer
Joshua Atkins, OPS, M. Rogers
Lawrence Bohannon, Volunteer, Armstrong
Colleen Morrison, OPS, Grosser
Holly Chamberlin, Research Programs,
Ashish Mistra, Student, Ehsani
Kiran Mann, Student, Schumann
Maria Albiach-Marti, Visiting Scientist, Dawson
Dr. Hamdy Emara, Visiting Scientist, Grosser
Elena Tellez Rubio, OPS, Brlansky
Amary Timpe, OPS, Ehsani
Mary Brawley, OPS, Brlansky
Diamond Basnaw II, Volunteer, Hoover
Elizabeth Northeimer, OPS, Reyes
Daniel Rivas, Student, Albrigo
Avijit Roy Postdoc, Brlansky
Ling Wang, OPS, Gmitter
Marcia Alden, Librarian, Rouseff
Melanie Watts, P.R., Rouseff
Huang Shu, Biological Scientist, Gmitter
Young Choi, Postdoc, Gmiter
Tracy Meadows, Biological Scientist,
Pam Holderman, Business Office, McDonald
Congratulations to Ahmad A.
Omar (recent Ph.D. graduate, pic-
tured left) for receiving the 2006
Wilton R. Earle Award and 2006
travel award from the Society for
In Vitro Biology at SIVB meeting
June 3-7, 2006.
After the FSHS meet-
ing in June, from left to
right: Luis Pozo, Fer-
nando Alferez, Karthik
J. John-Karuppiah, and
Kuo-Tan Li (pictured on
right); all from Burn's
lab, enjoyed an Indian
restaurant in Tampa, an invitation of Karthik. After attending
the welcome reception of the Florida State Horticultural Soci-
ety on June 4, 2006 in Tampa, a group of people from CREC
Diego Pozueta and
his wife Elena
Tellez, Dr. Fernan-
do Alferez, and a
Karthik J. John -Ka-
ruppiah, pictured to
the left) visited a 370-
foot topsail schooner
Dr. Ed Etxeberria (pic-
tured above) shares one
of his photos during his
April vacation to Spain.
This picture was taken
in the town of Lesaka in
northern Spain right at
the border with France.
From left to right. Carlos
Rene Rodriguez (brother-
in-law), Merci Etxeberria
(cousin), Hiram Martinez
Rodriguez (niece); Javier Pozueta (Spanish Co-worker); Carmen Po-
zuetaa (his daughter); Dr. Ed Etxeberria; Alma Etxeberria (sister);
Leyda Etxeberria (sister); Ana Etxeberria (sister); Wilma Vazques
(close family friend).
Sharath Cugati (student of Dr. Bill Miller, pictured to the right of
Ms. Gator) obtained his Ph.D. in Agricultural & Biological Engineer-
ing at the May graduation. Also, his wife, Inka Hublitz (pictured to
the left of Mr. Gator), obtained her Ph.D. from the same department
at the same ceremony. The couple were also blessed with the birth of
their son, Leandro Tarun (pictured with mom and dad), who arrived
on the June 3, weighing 8 lb.