The Mission of UF/IFAS is to develop
knowledge in agricultural, human and
natural resources and to make that
knowledge accessible to sustain and
enhance the quality of human life.
Fall 2008 UF
October, November, and
Lake County Extension
It has been three years since HLB was detected in Florida. So far, we in the northern area of citrus production
have been blessed with low infection rates. However, the disease is becoming more prevalent in our area and
surveying and removal of symptomatic trees should be a priority during the fall/winter months when the symp-
toms are most easily detected. Our infection rates are low and we hopefully have an opportunity to keep them
that way by utilizing proper production practices of vector control, scouting, and removal of diseased trees.
COOPERATIVE EXTENSION SERVICE, UNIVERSITY OF FLORIDA, INSTITUTE OF FOOD AND AGRICULTURAL SCIENCES, Larry R.
Arrington, Director, in cooperation with the United States Department of Agriculture, publishes this information to further the purpose of the May 8
and June 30, 1914 Acts of Congress; and is authorized to provide research, educational information, and other services only to individuals and insti-
tutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, na-
tional origin, political opinions, or affiliations. Single copies of extension publications (excluding 4-H and youth publications) are available free to
Florida residents from county extension offices. Information about alternate formats is available from IFAS Communication Services, University of
Florida, PO Box 110810, Gainesville, FL 32611-0810.
S. Africa Trip Report
I had the opportunity to lead a Florida citrus
industry group to South Africa this past month
on a tour the South African citrus industry.
My contacts in South Africa were Drs. Hennie
le Roux and Graham Barry. They were won-
derful hosts giving of their time and energy to
expose us to as much of the South African cit-
rus industry as possible within our time con-
straints. Of particular interest were two topics;
how they dealt with their greening disease
problem and their irrigation system often re-
ferred to as open hydroponic system (OHS).
Pictured above: Ben McLean, Kelly Morgan, Skip Miller, Steve
Futch, Lee Jones, and Larry Parsons take notes as Hennie le Roux
explains the challenges of producing citrus in South Africa.
South African Greening Disease
It is first important to understand that what they call greening disease and what we call greening disease is dif-
ferent. Here in Florida we have the Asian strain of HLB, in South Africa they have the African strain of HLB.
The South Africans are the first to admit that their strain of the bacteria that causes "greening" is much milder
(causes a much slower decline) than the
Asian strain found in Florida. In fact, by
the end of the trip we were referring to
their disease as greening (they were the
first to coin the term) and our disease as
c.: HLB, hence forth I will refer to their dis-
ease as African greening and ours as HLB.
South Africa has had African greening
since the 1930's. The vector for African
greening is the African citrus psyllid not
the Asian citrus psyllid as is common in
Florida. Both the African citrus psyllid and
Pictured above: A "typical" African greening infected tree showing yel- African greening are temperature sensitive
S. Africa Trip Report
and do not survive in warm climates (all stages of psyllids killed above 90 degrees F). So it is the cooler areas
of South Africa where the disease and vector occur.
The South African citrus industry is geographically separated by large distances across the country. To travel
from one growing area to another may take several hours, over distinct geographic separations such as moun-
tain passes. These remote separated areas are obviously very different from Florida. In Florida one can find
citrus contiguously up and down the state. African greening is the number one problem in a few areas of
South Africa. In the past African greening has taken out complete growing regions that have never been re-
planted. However, the general consensus among South African is that currently African greening is manage-
There were three periods of historic significance; the first in the 1930's in the northwestern province, the sec-
ond around 1960's, and the third encompasses more current production. During the 1960's 38% of all South
African citrus trees were infected with African greening, this was largely due to infected nursery stock. Some
growers experimented with antibiotics during this time period but found it only suppressed the disease not
killed the bacteria. Today, during the 3rd period growers are "living with South African greening". The keys
to their African greening production
practices are very similar to IFAS '
recommendations for HLB.
They first started by removing dis-
eased groves entirely. They also
moved to nurseries with screens that
produce "certified" and clean nurs-
ery stock. Another key for South
African growers was learning to
properly control the vector. They Pictured above: A trunk pesticide applicator used in South Africa for African
citrus psyllid control. Trunk application during a drought are not done as they-
use systemic insecticides applied to will stress or girdle tress.
the trunk of trees that give control
for up to 52 days in young trees. Some of these pesticides have been banned in the U.S. and we are not able to
use them. They also use Imidacloprid drenches which give them up to 110 days control of African citrus psyl-
lids. They attributed vector control as the number one reason as to why African greening is not as big of an
S. Africa Trip Report
issue as it once was. That being said, we had a difficult time finding damaged leaves caused by the psyllid
feeding and we did not see one psyllid during the ten day trip. The vector population is extremely low com-
pared with Asian citrus psyllid in Florida. Also, climatic conditions are such that they have a more regular
flushing pattern than in Florida, allowing for easier timing of applications for vector control.
Once a tree is infected with African greening growers tend to prune out infected limbs (this practice is not rec-
ommended by their scientists and extension personnel). The South African growers do this to try and keep
productivity of the citrus trees as long as possible. We were told that trees showing visible African greening
symptoms can remain productive for up to ten years. This differs with what is being observed in Brazil with
HLB, usually trees become unproductive within three years. In South Africa if trees start to show more visible
greening symptoms after the first year of pruning, then the entire tree is removed. Once the grove is deemed
unproductive (economic decision) the grove is pushed out and replanted entirely.
High Densities and OHS
Most South African growers are replanting at higher densities and many are utilizing drip irrigation systems.
Water is a very limited resource and drip irrigation has become a standard practice as it conserves water re-
Pictured left is a grove that
was planted in an old river
bottom. The grower had to
dig a hole and bring soil in
from a different location to
fill the hole. Trees are then
managed using pulse fertiga-
tion. We observed 4 year
old healthy trees with a crop
at this same location.
Also notice the use of Aus-
tralian pine for windbreaks
in the background. Wind
scarring was this growers
sources by forty percent. Many of the soils located in the Northeast part of the country, which is the area
where African greening is mostly located, are composed of 15-20% clay. At these levels, the water holding
capacity of the soils is increased. However, in the Citrusdale growing area (Southwest S. Africa) we observed
drip irrigation systems on sandy soils with as little as 2% clay, typically our ridge soils have less than 1% clay.
Freezes are not a concern in South Africa, so they have no issue of losing cold protection capabilities.
S. Africa Trip Report
Pulse fertigation is the application of water and fertilizer thru a drip system multiple times a day (number of
times a day depends on environmental conditions and time of year). OHS (open hydroponic system) is a
coined term for a pulse fertigation system.
Some of the South African growers reported
converting to pulse fertigation improved
their production by 25%, even in sandy
soils. Converting irrigation systems is ex-
pensive but growers reported return on in-
vestment as soon as eighteen months. Also,
South African growers stated that the poorer
the site for citrus production the more effec-
tive the OHS system operated. It was stated
that it was a tool "to overcome poor soils".
Pictured above a drip emitter used for pulse fertigation. As you can The OHS system did have some naysayers
see the root systems are very responsive to this technique in South Af-
rica. as well, a few growers felt that micro sprin-
klers did a better job and were preferred. It
struck me that growers who did a very good job managing their irrigation systems and fertilization practices
were the most satisfied with their move to a intensive pulse fertigation system. Even though the OHS systems
are all operated by computers and required little in terms of operation labor, they do require daily attention, to
adjust the irrigation schedul- .
ing of pulses to the demand of
the trees. IFAS researchers
are currently evaluating these
techniques around the state
and we should have a good
idea in the next few years if a
type of advanced fertigation
system using drip irrigation
will benefit Florida citrus pro-
duction. If you are interested
in learning more about this sys- Pictured above is a Nadorcott (we call the variety W. Murcott) grove that utilizes the
OHS irrigation and high density planting.
S. Africa Trip Report
ter in Florida conditions please see the information on our Field Day scheduled for November 14th.
Higher density plantings at spacing of 18' x 6' are common. Growers moved to higher densities plantings to
maximize yield at an earlier age and as a response to African greening. The idea is to maximize fruit produc-
tion after planting between years three thru seven, decreasing the time it takes to get a return on investment. A
crop loss during this time period would make higher density planting less attractive. Thus economic analysis
for an individuals particular situation (cost of trees, income on variety grown, production costs) is important to
make sure that higher densities are worth pursuing.
South African citrus and opportunities
The use of pulse fertigation coupled with the earlier pro-
duction due to the higher density plantings are some of the
practices that have led to the growth of the South African
citrus industry. Currently the South African citrus industry
is the twelve largest in the world. They are the second larg-
est exporter with 65% of their fruit going to Europe and the
Middle East. They have approximately 150,000 acres of
citrus planted, 1400 citrus growers, 75 packing houses, and
100 exporters (although 10 large exporters). Fresh fruit pro-
duction is S. Africa's citrus industry. In Florida we are and Pictured above is a Nadorcott (W. Murcott) which is
have historically been an orange juice industry. However, I the most profitable fruit in South Africa currently.
believe that in Central Florida there exist the opportunity to increase our zipper skin (tangerine) fresh fruit
plantings. It is a sentiment that John Jackson also had while in my position. In my opinion the potential to
share information between S. Africa and Florida citrus industries is tremendous. The fact that they produce
fruit during the opposite times of the year (southern Hemisphere) to Florida means that we do not compete
against one another in the market place and can in fact compliment each other. If we successfully grow and
market the same varieties then the marketing window to consumers can be year around.
The one thing that resonates from the trip was that the S. African citrus industry when facing a major threat
changed their production practice in response to that threat. Of course that is what we in Florida citrus indus-
try are currently challenged to accomplish. In areas were HLB infection rates are low (such as Central Florida)
we must be proactive in first controlling the vector to the best of our abilities, scouting and removing infected
trees, and make sure we reset or replant with certified nursery stock. Will these be enough to overcome HLB
S. Africa Trip Report
in Florida? No one knows that answer for sure, but we are learning, as an example we have a much better un-
derstanding of Asian citrus psyllid control techniques from just two years ago. In Florida there is on going re-
search in many arenas that will pay dividends in knowledge over the next few years. Some may ask, how will
we be able to afford our new production practices? We must also become more productive, it maybe that ad-
vanced fertigation and higher density plantings may play a role.
This article was just a general over-
view of this trip. Other accom-
plishments of this trip include new
relationships being made, knowl-
edge being shared between the
South African and Florida partici-
pants, and new research ideas being
formed. As much as I learned from
spending time with the South Afri-
can growers, I also learned from the
time spent with Florida growers,
extension personnel, and research- Pictured above: Ben McLean observes a demonstration of how girdling is con-
ducted on a five year old tree. Girdling is a tool that some South African
ers. I would highly encourage you growers are utilizing to help set fruit at younger ages.
to participate in traveling to meet
other growers in different parts of the country or world if presented with the opportunity. I believe that these
opportunities pay dividends in new ideas for Florida citrus production.
How can Ryan travel when IFAS is under a budget crisis? This trip was made possible by grower dona-
tions to my University of Florida Foundation SHARE account. If you think that this experience and the infor-
mation provided from these types of experiences are beneficial and would like lend your support. I encourage
you to donate to my SHARE account, checks can be made out to the UF Foundation Inc., with a reference to
the Central Florida Citrus Extension Program and mailed to:
Office of Development-SHARE
P. O. Box 110170
Gainesville, FL 32611.
I appreciate your support and am striving to be the best extension agent I possibly can be!
S. Florida field day Fri. Oct. 10th
McKinnon Corp & Smoak Groves Visit
As requested by the Central Florida Citrus Ad-
visory Committee on October 22nd we will be
traveling to South Florida to take a second look
at two groves with greening that we have been
monitoring over the past two years. The first
stop will be in Felda to look at McKinnon
Corp.'s grove. McKinnon Corp.'s grove has
been infected with greening for the past two
years. The decision was made not to remove
infected trees due to high infection rates. In-
stead a foliar nutrition program as been util-
ized with the hopes of maintaining tree health
and productivity. The second stop will be in
Lake Placid to look at Smoak family's grove.
This grove has also had greening for the past
two years. They have been actively surveying
and removing greening infected trees. Both
groves have been aggressively managing
psyllid population levels.
Leave extension office in Tavares
10:30AM Meet at McKinnon Corp Grove
12:30PM Lunch at Hendry Co. extension office
2:30PM Meet at Smoak's grove
4:00PM Leave for home
6:15PM Back at Lake Co. extension office
I am planning on driving the county van and
can accommodate 9 passengers. If you plan
on attending (please let us know for food plan-
ning purposes) or would like a ride please
call Maggie Jarrell at 352-343-4101 to reserve
a spot. There is a $15.00 cost per person, pay-
able to Lake County Citrus Extension Program.
Farm Safety Day Fri. Oct 31st
Lake County Extension Office
We will be holding our annual Farm Safety Day
on Friday October 31st at the Lake County Ex-
tension office. Attendees will receive a certifi-
cate of completion. The cost of attending is
$15 per person. Please register with Maggie
Jarrell at 352-343-4101 or email at
email@example.com. Please send checks payable
to Lake County Citrus Extension Program.
8:15-8:30 Sign In
Tractor and Equipment Safety
9:20-10:10 Pesticide Safety and Activity
-Dr. Richard Tyson
Farm Safety Jeopardy
Heat Stress and Skin Cancer
Awareness -Julie England
Thursday Nov. 6th
Orange County Extension Office
If you have a pesticide license and are in need
of some CEU's for renewal. I highly recom-
mend our CEU day where you can obtain them
all at once. We hold two CEU days a year and
rotate between four counties, the next CEU Day
will be held at Orange Co. Extension office.
Registration forms can be downloaded from our
website at http://cfextension.ifas.ufl.edu/
documents/CEUDAY-NOV2008.pdf. You can
also register by phone by calling the Orange
Co. extension at 407-254-9200.
Field Day Fri. Nov. 14th
Arapaho Citrus & USDA Horticultural
On November 14th we will be traveling to St.
Lucie County to see Arapaho Citrus's Ad-
vanced fertigation grove. The grove utilizes
pulse fertigation thru a drip system to grow
trees and produce fruit more quickly than tra-
ditional systems. Also the grove was planted
at higher densities (using different scion and
rootstock combinations) to come into full pro-
duction sooner. This grove is experimental in
nature but may prove to be a model for future
citrus production. While in the Fort Pierce
area Dr. Calvin Arnold will lead us on a tour of
the USDA Horticultural Research Laboratory.
We will have the opportunity to get an update
on the USDA's HLB's research efforts and get a
close up look at the research facility.
Leave extension office in Tavares
Meet at Arapaho Citrus
Lunch at St. Lucie Co. extension
Tour of USDA Research Lab.
Leave for home
Back at Lake Co. extension office
I am planning on driving the county van and
can accommodate 9 passengers. If you plan
on attending or would like a ride please call
Maggie Jarrell at 352-343-4101 to let us know
(for food ordering purposes) or reserve a spot
on the van. There is a $10 cost per person,
payable to the Lake County Citrus Extension
International HLB Conference
Orlando Dec. 1-5th
From the website:
The mission of this conference is to assemble
the greatest number possible from the inter-
national research community, plus regulatory
agency representatives, and commercial in-
dustry leaders with specific expertise on HLB
for the express purpose to exchange the latest
information, knowledge, ideas and concepts
relative to HLB. We also want to provide a
venue for increased international collabora-
tion as well to deal with a disease that does
not respect the political or physical bounda-
ries of states or countries. Invited scientists
and participants will be asked to reach be-
yond current information, thinking, scientific
disciplines, and dogma in an attempt to
broaden our global knowledge, provide new
researchable goals and horizons and foster
progress toward new and innovative solutions
The theme of this International Research Con-
ference on Huanglongbing is Reaching Be-
yond Boundaries, indicating our determina-
tion and need to reach beyond political, sci-
entific and national boundaries in an attempt
to find commercially feasible solutions to this
If you are interested in registering for this
conference you can do so on the website or
by contacting Ms. Penny McCurry,
mccurrp(@ doacs. state.fl.us.
J iage 1
Pesticide Applicator Review and Exam
Lake County Extension Dec. 9th
A pesticide license is required by any per-
sons who apply or supervise the application
of restricted use pesticides for agricultural
production. This certification requires a pass-
ing grade of 70% on the General Standards
and Private exam. This certification must be
renewed ever 4 years either by testing or by
There will be a review and exam in Tavares
on December 9th. The review starts at 8:30
AM. There is a $20 charge for the class.
It is advisable to purchase the "Applying pes-
ticides correctly" and "The private applicator
training manual" from the IFAS bookstore on-
line at www.ifasbooks.ufl.edu or by calling
The private agricultural license itself costs
$60 which does not have to be paid until after
you pass the exam. To register please call or
email Maggie Jarrell at 352-343-4101 or
0J Meeting Dec. 16th 5-7PM
Lake Co. Extension Office
Please plan on joining us in Tavares at the Ag-
ricultural Center on December 16th from 5
PM to 7 PM. The program will focus the up-
coming winter season and cold protection. A
free dinner will be provided. Please call
Maggie by December 12th to register at 352-
343-4101. It is important that you let us know
if you are going to attend so that we know how
much food to order! Its never too early to call.
5:45-6:25 Cold Protection, FAWN, Weather
Watch -Ryan Atwood
6:25-6:55 Winter Weather Prediction based
On ENSO -Dr. Clyde Fraisse
A cooperative effort of Central
Florida citrus growers for
aerial application of a dormant
/ spray for psyllid control
The Central Florida Citrus Advisory Committee asked me to look into the possibilities of coordi-
nating an area wide psyllid control program. Researchers have shown that the most important
pesticide application to reduce psyllid population levels is the dormant spray (Feb.). Research-
ers have also shown the benefit of area wide applications for reducing psyllid population levels.
One of the limiting factors for aerial application of pesticides is that large acreages are required
to make it cost effective. By unifying our efforts we can potentially attract aerial applicators at a
reasonable price to apply area wide dormant sprays in Central Florida (some locations maybe to
close to homes to participate). I have contacted a number of aerial applicators for pricing. How-
ever, first I must know the amount of acreage and location in order to get accurate estimate. The
are also a number of other factors to consider such as location of groves to local airstrips. I order
to proceed further with this effort I need to know who would be interested in participating. If you
are interested please contact me via email or office phone with your name, phone number, email
address and groves) location (street and city and/or TRS).
i Response Program
2008 DPI Grower Services
Supplemental Survey: Grower-requested pest and disease scouting provided once a
season on a first-come, first-served basis (may be available more frequently when time and
resources permit as determined by the local DPI/CHRP field office supervisor).
Fresh FAit Survey: Inspection of grove blocks and immediate vicinity as necessary to meet
current requirements for shipment of fresh fruit into the European Union.
Nursery Envkons Survey: Annual survey, as required, for citrus pests and diseases in
support of CHRP guidelines.
Disease Recognitin: circus canker, huanglongbing, citrus variegated chlorosis and citrus
Self-Survey: Provide training and documentation methods to growers so they may complete
systematic grower surveys.
Decontarrmnaon Training: Provide information on proper mixtures and application of
deconlaminants. Train and certify grower trainers
Train the Trainer. Work one-on-one with grower-designated trainers to customize and
improve a grower's program.
Grower Outreach Program
Local DPUCHRP office supervisors will increase visits with regional grower associations
and promote increased feld office communication with growers.
Provide assistance in developing business plans
To request information on these services call 1-800-282-5153
M PLANT INDUSTRY
Ch 'la I H s nansn uwrm Is unia r
'Pa e 12
List of insecticides and miticides recommended for use in the Florida Citrus Pest Management Guide and their effects on citrus
pests and their natural enemies
Pesticide active Effects on
ingredient Mode o Psyllid Leafminer Rust Mites Spider Mites Root Weevil Scale Insects Mealybugs natural enemies
Abamectin + oil 6 ++ +++,R +++,R + + (oil) +(oil) + (oil) medium
Acetamiprid 4 +++,R + ++ medium
Aldicarb 1A +++,R +++,R ++ ow
Carbaryl 1A +++,R + ? +++,R +++,R + high
Chlorpyrifos 1B +++,R + + -+ +++,R +++,R high
Diflubenzuron 15 ++ +++,R +++,R -+++,R low
Dimethoate 1B +++ ? ++,R + high
Fenbutatin oxide 12 +++,R +++,R low
Fenpropathrin 3 +++,R + + +++,R + high
Imidacloprid (soil 4 +++,R +++,R + ++ + low
Imidacloprid (foliar 4 +++,R + -++ + medium
Petroleum oil NR + ++,R ++,R ++ +(eggs) ++,R + low
Phosmet 1B +++ ? +++,R ? ? medium/high
Pyridaben 21 +++,R +++,R high
Spinosad 5 +++,R low
Spinetoram 5 +++ +++,R ? ? ? ? low
Spirodiclofen 23 +++,R +++,R ?- low
Sulfur NR +++,R +++ ? ? high (short term)
1Mode of action dass for citrus pesticides from the Insecticide Resistance Action Committee; NR = no resistance potential
(R) = product recommended for control of p
(+-+) = good control of pest
(++) = short-term control of pest
(+) = low levels of pest suppression
(-) = no observed control of pest
(?)= insufficient data available
est in Florida trus P est Management Guide
For more information, contact the University of Florida, IFAS, Citrus Research and Education Center 863-956-1151,
www.crec.ifas.ufl.edu, or your local county citrus extension agent.
Created by: Michael E. Rogers, revised August 2008
Photo Credit: University of Florida
Imidcrd ail drench rate for enlid niantinsr nn nnnhAarine citrus
I f oz
0.057 fl oz
4ft- 6ft 16 fl oz 2 0.114 fl o 8.77 trees
Imidacloprid 4.6F (Admire PRO
2ft- 4 ft 3.5 fl oz 4 0.025 fl oz 40 trees
4ft- 6ft 7 fl oz 2 0.05 fl oz 20 trees
*Rates based on 140 trees per acre
Restricted Entry Interval (REI) and Pre-Harvest Interval (PHI) for products listed on front page
Active Ingredient Restricted entry interval (REI) Pre-harvest interval (PHI)
Abamectin 12 hours 7 days
Acetamiprid 12 hours 7 days
Aldicarb 48 hours 0; 30 days demons
Carbaryl 12 hours 5 days
Chlorpyrfos 5 days 21 days
Diflubenzuron 12 hours 21 days
Dimethoate 48 hours 15 days
Fenbutatin oxide 48 hours 7 days
Fenpropathrin 24 hours 1 day
Imidacloprid 12 hours 0
Phosmet 24 hours 7 days
Pyridaben 12 hours 7 days
Spinosad 4 hours 1 day
Spinetram 4 hours 1 day
Spirdiclofen 12 hours 7 days
Sulfur 12hours 0
Use pestides safely. Read and follow direction the manufacturer's label.
Additional citrus pest management information can be found in the Florida Citrus Pest Management
Guide available online at http://www.crec.ifas.ufl.edu/extension/pest/index.htm
PULL HERE TO OPEN It
I GROUP FUNGICIDE I
For the control of certain diseases in various crops caused by
the Oomycete class of fungi
Other Ingredients: 54.7%
CAS Nos. 70630- 7-0and69516-34-3
Contains 4 Ibs active ingredient per gallon.
KEEP OUT OF REACH OF CHILDREN.
See additional precautionary statements and directions
for use inside booklet
EPA Reg. No. 100-1202
Formulated in the USA
SCP 1202A-L28 0308
NIt tContents r
EPA R. No. 621in .52
EPA 24(:] SAdpcal LoIal NIal Rgillrai S N No. FI 11004)(
Control of Citrus Rsprouts From Cut Stumps in Citrus Groves
(F4r DIlalbmon ind U..G Only in th. St oft Floid.)
Spocila Conditimos end Risks of usI
*lEt MI 1.h I |t I 1 IiL 1. 11 IT l T H%'
CRMOP IEI) REDUCTION AiNOOR CROP IOSi TO THE CROP- RFRAD AND UNMER TAND THMSE
SPECIAL COHOITiONS AND RISKS OF USE BEFORE USING THE PRODUCT ON THE CROP.
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In, 1 r1 *- 'r t r o. .jn iti r p-' Al, I n r r.p. j dr .l e e.. l ,. suI r lM fu iu l i
ni othen rlsvuM fiOcors.
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-t .jI ,, ;'* S .1 in. ,,i |Ic i, i f .r : /l.r^.
If th1e Spwil Conditino and RiSt*. of 01LM ae noa acceptable. lbn unopened Prl0uct mny be raelmM InO
flel lN 1, t5furtd O i*nd i. a diffolnl btlmd U in .ccordnca wilh ih labl arf1z1d to 0h. PrnlkCl
.....l~r~l +,iI1 I ,i l P++ i rl 1 ,d -i11- .iii
Ridomil Gold SL label changes to allow for Remedy SLN label more clearly allows
tank mixing for young resets. for use on citrus tree stumps.
Ridomil Gold SL label was recently modified
at the request of Florida growers. The new
label provides and permits the specific use
directions for individual tree treatment for re-
sets/new plantings. In addition this label per-
mits growers to tank mix apply Ridomil Gold
SL with other pesticides approved for Florida
citrus production. Most common use is a tank
mix with Imidacloprid (used for psyllid con-
trol). Precaution is required when mixing Ri-
domil with residual herbicides on trees less
than 3 years of age, as injury may result.
As of this past August Remedy has a supple-
mental label for use in treating citrus tree
stumps to prevent sprouting. Dr. Steve Futch
has run trials at citrus groves in South Florida
and has reported success in limiting sprouts
from greening infected citrus trees that were
removed from the grove. Dr. Futch recom-
mends the use of dye while using the product
to aid in the proper placement of the applied
materials by workers. Delayed application of
material or rain events can limit the effective-
ness of this material.
Weather Watch 2008-2009 Sign Up Underway
We will be starting up the Weather Watch program on November 12th. For those that have not
participated in the past the Weather Watch program has been in operation for the past 37 years.
The program gives the general weather outlook during warm periods and gives three to four
daily updates during freeze events. Fred Crosby brings 40+ years of agricultural weather fore-
cast experience to our advisories. The outlook can be accessed 24/7 with dedicated phone
lines. John Jackson has also agreed to continue to assist during freeze events. The cost of this
program is $100.00 for the season. If you would like to sign up please fill out the flyer in the
back of the newsletter and fax or mail it to the Lake County Extension office.
'Yag*e 14 **** ************
S mme, 2008 The Vision for the University of Florida's Institute of Food and Agricultural
Sciences (UF/IFAS) is to increase and strengthen the knowledge base and tech-
Lake County Agricultural Center *
1951 Woodlea Rd.
Tavares, FL 32778 *
Phone: 352-343-4101 *
Expanding the profitability of global competitiveness and sustainability of
the food, fiber, and agricultural industries of Florida.
Protecting and sustaining natural resource and environmental systems.
Enhancing the development of human resources.
Improving the quality of human life.
REMINDER-Mini Greening Summit
Lake County Ag Center in Tavares September 30th from 9:45 to Noon
Topics include: everything related to HLB and canker. Pesticide CEU's and CCA's available
A free lunch will be provided after the program. Please call ASAP to let us know if you are plan-
ning on coming so that we can make sure to have a enough food.
Locations of interest
Nextel Direct Connect # *
Email Address *
*for those with this service we will have an alert
I would like to subscribe to the Central Florida Weather Watch service and understand that I am
NOT to release the unlisted telephone number to anyone.
Enclosed is my check in the amount of $100 made payable to:
1951 Woodlea Rd.
Tavares, FL 32778
The unlisted number will be sent prior to commencement of the service. We will begin Novem-
ber 10, 2008, and run until the threat of cold has passed (generally early to mid April).