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________________________________________________ Institute of Food and Agricultural Sciences |
SOUTH FLORIDA
VEGETABLE PEST AND DISEASE
HOTLINE
April 5, 2004
Spring-break-like
conditions prevailed across most of South Florida over much of the past
two weeks with mostly warm, dry weather blanketing the area. Spotty
showers occurred over west-central production areas during the week of
March 21 through 27 while significant rain fell over the extreme
southern
Peninsula with Homestead, Ft. Lauderdale and other east coast growing
areas
reporting from a quarter to an inch and a quarter of rain for the week.
Favorable conditions have kept planting and harvesting on track in most central and southern Peninsula areas.
Crops
coming to market include snap beans, celery, cucumbers, peppers,
potatoes,
radishes, squash, strawberries, sweet corn, tomatoes, watermelons and
specialty
crops.Strawberry
picking, celery cutting, radish
digging and the harvesting of leafy green vegetables such as escarole,
endive and lettuce in southern areas are slowing seasonally as warmer
temperatures
arrive.Watermelon harvest began in the Immokalee
area last week and light quantities of melons are moving to market.Quality
is mostly good.
FAWN Weather Summary
| Date | Air Temp °F) | Rainfall |
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| Min | Max | (Inches) | 40°F | 45°F | 50°F | 55°F | 60°F | 65°F | 70°F | 75°F | |
| Bradenton |
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Respondents around Manatee County
indicate
that leafminer
activity has increased steadily over the past two weeks.Some
growers have treated and gotten good control but note that leafminers
have
come on early compared to last spring.Growers are
concerned about open mines as an entry point for target spot or early
blight
problems later this season.
Growers and scouts in the Homestead
area continue to report some problems with leafminer.
Leafminers are still present around southwest Florida
but pressure varies between locations with several areas reaching
treatment
threshold levels and other areas reporting little pressure.Leafminer
have been particularly active in melons and other cucurbits.Crops
affected include beans, cucurbits, eggplant, tomatoes and specialty
crops.
East Coast growers
report some problems with leafminers on leafy vegetables, as well as
cucurbits,
eggplant and tomatoes.
Mites
Growers and scouts
on the East Coast continue to report problems with two-spotted and red
spider mites in eggplant as well as problems with mites in tomato and
specialty
items especially along field margins and ditch banks.Reports
indicate that broadmites are still present in pepper and eggplant in
mostly
low numbers but indicate that they have been worse in some locations
where
they have persisted through out the season.
Around Southwest Florida, reports indicate spidermites
are starting to build up in some melons, cucumbers, eggplants, and
tomatoes.
Scouts also report finding very high populations on nightshade and
other
weeds in a number of locations as well.Some new
broadmite
activity has been reported in a few pepper and eggplant fields.
Reports from Homestead report that
red and two spotted spider mites are becoming more numerous in a
variety
of crops including beans, cucurbits, eggplant, strawberries and
tomatoes.Broadmites
are widely present in eggplant and pepper with some heavy pressure
being
reported in places on peppers.
Growers in West Central Florida report
mites
are being found in cantaloupes and other cucurbits, especially in
fields
that are being double cropped following strawberries.Respondents
also report some problems with spidermites and broadmites in pepper in
the Plant City/Dover area.
Pepper Weevils
Respondents around southwest Florida
indicate that pepper weevils have been detected in a few more pepper
fields
but report that overall pressure remains low with a few exceptions.
Growers and scouts
on the East Coast report scattered pepper weevil activity.Numbers
remain low in most places but some hotspots have been noted.
Around Homestead, respondents report
pepper weevils populations are beginning to increase and scouts report
increased trap counts over the past few weeks.
Diseases
Growers and scouts report that disease
pressure remains low to moderate in most locations, with the exception
of West Central Florida where growers have been battling tomato yellow
leaf curl.
Tomato Yellow Leaf Curl
Virus
Around Homestead, respondents report
that new TYLCV infections are increasing rapidly and report a TYLCV
“explosion”
over the past few weeks.
In
Manatee County, reports indicate that TYLCV infections are still
increasing,
but some respondents note that new infections seem to have leveled off
for now with 20-30% infection not uncommon in older plantings, with
some
isolated fields reporting even higher incidence.Respondents
report that many younger plantings show much lower disease incidence.Phyllis
Gilreath reports that Virus incidence is much higher than we would
expect
from the number of whitefly being seen and indicates that a high
proportion
of the whiteflies entering fields were obviously viruliferous.
In Southwest Florida, Tomato Yellow Leaf Curl Virus
incidence continues to increases seasonally as whitefly populations
build
in tomatoes. Infection rates
vary widely
with many fields remaining below 1% and some hotspots reaching over 50%.
Growers and scouts on the East Coast
report increasing incidence of TYLCV as the season progresses with some
fields showing up to 10% infection or higher.
Bacterial Spot
Around Southwest Florida, bacterial spot is still widely present
on tomato and to a lesser extent pepper.Activity
has abated significantly with recent dry weather but foggy mornings
have
permitted slow creep within plant canopies where it is present.Incidence
and severity ranges from low to moderate with a few locations reporting
fruit infections.
Respondents around the Homestead area report new bacterial spot
activity in tomato.
East Coast growers report quite a
bit of bacterial spot activity in tomato considering the time of the
year
and relatively dry weather.
Respondents in Manatee/Ruskin area
report that bacterial
spot flared up somewhat after a rain event two weeks ago, but pressure
is still low to moderate in most fields.
Fusarium crown rot
Fusarium crown rot in tomato continues
to affect tomato fields around Immokalee.Incidence
and severity is variable and ranges from low to fairly high depending
on
the location.
Dr Ken Pernezny reports finding a
significant amount of fusarium crown rot in tomato during recent field
surveys in Palm Beach County.
Ken notes that symptoms range from
slightly flagging plants to complete plant death.Occasionally,
a canker may be evident on the outside of the lower stem, but most of
the
time it is absent. Vascular browning is very evident when the
lower
parts of stems are cut open longitudinally. Dr Pernezny notes a
key
diagnostic symptom is that the vascular discoloration does not extend
very
far up the stem as is exhibited in true Fusarium wilt.
Fusarium Wilt
Around Southwest Florida fusarium
wilt is beginning to show up in a number of widely scattered locations
in watermelon.Incidence
and severity varies but is moderate to high in few locations.
Reports
from the Bradenton area indicate that fusarium wilt being diagnosed in
samples from melon fields, including some fields with symptoms
reminiscent
of last seasons vine decline problems.
Gummy stem blight
Growers and scouts
around Immokalee indicate although gummy stem blight is widely present
in watermelon, new activity has abated in recent days with some
exceptions.In
a few locations, significant stand loss has resulted from early
infections
present on transplants.
Respondents
in Manatee County report finding gummy stem blight in melons and squash.Pressure
is fairly heavy in some fields but dry weather should help the
situation.
Watermelon Vine Decline and Fruit Rot Alert
For at least the past 2 seasons, central and southwest Florida
growers
have experienced problems with watermelon vine decline late in the crop
cycle approaching harvest characterized by wilting in the plant,
scorched
leaves, defoliation and rapid vine collapse on maturing vines.
Frequently, fruit were observed with greasy, necrotic lesions on the
interior
portion of the rind that rendered the fruit non-marketable.
Investigations to date have been inconclusive for identifying a
cause. No pathogen was consistently associated with the symptoms
nor
were any cultural or environmental factors identified as the cause.
If
you see or suspect a problem, please notify your county extension agent
or the Plant Disease Clinic in Immokalee so we can begin collecting
samples
and information to try and pinpoint a cause.Under
the leadership of Dr. Pam Roberts at Immokalee, we now have
additional manpower
and funding to follow-up more closely on disease reports and to
address this problem if or when it appears this season. A significant
number
of melons have been lost to this problem and we need to find a solution.
Late Blight
Late blight continues to be reported
on tomato in a number of areas around Southwest Florida and reports of
new infections continue to be received. Incidence and
occurrence
is sporadic and severity low in most places.
A few new reports of late blight have
been noted in Palm Beach County. Incidence and severity is
low and lack of moisture has limited activity.
No additional late blight infections
have been reported in the Manatee/Ruskin area.
Gray Mold
Growers and scouts continue to report
finding botrytis in tomato in several locations around southwest
Florida.
Reports from Palm Beach County note
that botrytis has caused bloom loss in some tomato plantings.
Sclerotinia
East Coast growers report scattered
problems with sclerotinia (white mold) in tomato.
Growers and scouts around Southwest
Florida report that sclerotinia is still widely present on bean,
pepper,
tomato and eggplant but note that new infections have declined in
recent
weeks.
Respondents in Homestead area report
that some new white mold infections have been noted in eggplant in
recent
weeks.
Some sclerotinia has been reported
on young tomato in the Bradenton area.
Early Blight
Reports from Homestead indicate that early blight is widely present
on tomato.
Early blight is widely present on
tomatoes in East Coast growing areas.Incidence
and occurrence is mostly low to moderate but specialty growers report
higher
incidence and severity in heirloom varieties.
Around southwest Florida, respondents
report low levels of early blight activity in tomato.
Reports indicate that Alternaria leaf
spot is present at low levels in melons around Southwest Florida and in
Manatee County.
Target spot
Respondents in Palm Beach County
report
that target spot is widely present on tomato.Incidence
and severity is mostly low.
Growers around Homestead report some
new target spot activity in tomato.
Growers and scouts around Southwest
Florida indicate that target spot remains active inside tomato plants
with
thick foliage.
Rust
Rust has also been reported on beans in the Devils Garden area of
Hendry County.
Respondents indicate that bean rust
is also widely present in Homestead primarily on non-resistant
varieties.
Downy Mildew
Reports indicate that
downy mildew is active in squash and cantaloupes in a number of
locations
across South Florida.No
reports have been received of downy mildew on watermelon to date.
Powdery mildew
Respondents in Palm Beach County indicate that they continue to
find powdery mildew on squash in a number of locations.Incidence
is low to moderate but drier conditions and crop maturity will favor
disease
development.Powdery mildew has also been reported
on beans, eggplant, pepper and snow peas as well.
Powdery mildew is also widely present on squash around southwest
Florida.Scouts operating around Immokalee
note
they are seeing some powdery mildew in older pepper in a few locations.Some
isolated cases of powdery mildew are also present in watermelon.
Phytophthora
Reports from the East Coast continue
to note that new infections by Phytophthoracapsici have
declined
in recent weeks.
Phytophthora is still present on pepper and squash in a several
locations around southwest Florida and some new activity has been noted.
Mosaic
Mosaic is widely present on squash around southwest Florida.Incidence
and severity varies from low to high depending on location.Mosaic
is also present at low levels in watermelon in few locations.
Dr. Susan Webb,
Entomologist
at UF/IFAS notes the virus is spread by aphids but not necessarily
melon
aphids but is often vectored by transitory aphid species that probe
weedy
hosts and cucurbits searching for a suitable host thus spreading the
disease.Surveys
conducted in South Florida over the past few years indicate that most
mosaic
symptoms observed in this area tends to be caused by the papaya
ringspot
virus.
Up Coming Meetings
Palm Beach County
April 14, 2004General
Standards/Core Test Review8
AM - 12 Noon
Private
Applicator1
PM – 3 PM
Belle
Glade Extension Office
2976
State Road 15
Belle
Glade, Florida
Contact
Laura Powell at 561-996-1655
Southwest Florida
April 6-7,
2004
Spanish Pesticide Applicator Training and Testing8:30
AM– 3 PM
Hendry County Extension Office
1085
Pratt Boulevard
LaBelle,
Florida
Contact 863-674-4092 for details
April 12-13,
2004
English Pesticide Applicator
Training and Testing8:30 AM–
3 PM
Hendry County Extension Office
1085
Pratt Boulevard
LaBelle,
Florida
Contact 863-674-4092 for details
April 20,
2004
Controlled Release Fertilizer in Vegetable Production 6:00
– 8:00 PM
UF/IFAS
- SW Florida Research and Education Center
Hwy 29 N
Immokalee, FL
Contact 863-674-4092 for details
May 5, 2004Production
And Utilization Of Compost In Florida8
AM- 5 PM
UF/IFAS
- SW Florida Research and Education Center
Hwy 29 N
Immokalee, FL
Pre-registration required, contact Dr Monica Ozores-Hampton at
239-658-3400
Other Meetings
June 21-24, 20041st
International Symposium on Tomato Diseases
and 19th Annual Tomato Disease Workshop
Grosvenor Resort at Walt Disney World
Orlando, Florida
For more information, visit http://plantdoctor.ifas.ufl.edu/istd.html
November 14 – 16, 2004 17th
International Pepper Conference
Naples
Beach Hotel and Golf Resort
Naples,
Florida
For more information, contact Gene McAvoy at 863-674-4092 or visit
http://conference.ifas.ufl.edu/pepper
Websites
Radcliffe’s IPM World Text Book – provides an electronic
alternative
or complement to printed textbooks for communicating information on
integrated
pest management (IPM). Objectives are to provide: 1) a venue for easily
maintaining and up-dating "state of the art" information from the
world's
leading experts on all aspects of IPM, 2) a resource economically
deliverable
anywhere in the world that can be freely downloaded and used by
students,
teachers, and IPM practitioners, 3) a forum for the international
presentation
of practical information and theory on IPM, 4) links to the vast and
rapidly
growing IPM resources available on the Internet including photographs
and
decision-support software.Go to
http://ipmworld.umn.edu/
Farmers worried about the methyl bromide ban starting Jan. 1 can relax for a year; the United States has been exempted from a United Nations Environment Programme phase-out seeking to limit global use of the fumigant.
"We look at it as a reprieve," said Chip Hinton of the Florida Strawberry Growers Association. "We have one more year to look at what we need to do to stay in business."
The United States will be allowed to use 7,659 tons of methyl bromide in 2005, according to a news release posted on the U.N. Environment Programme Web site, www.unep.org. That is 70 percent less than what it was permitted in 1991.
Touted by farmers as being the most effective fumigant to rid tomato, watermelon and strawberry farms of weeds and microscopic worms and soil-borne diseases, methyl bromide is listed as an ozone depleter by the U.N. agency.
The U.N. agency has ordered most developed nations to systematically curb the use of the fumigant, hoping to totally eliminate its usage in these countries by 2015.
"It's something that the
government
finds it can do without but hasn't found a replacement," said Bruce
Shackelford,
president of 4 Star Tomato Inc. "It's not to say we don't want to use
anything
else, we haven't found anything else."
The alternative to methyl bromide is hard to come by.The U.S. Department of Agriculture invested about $150 million in the past 11 years to research for such a replacement but was unsuccessful.
Looking for a substitute that could eradicate weeds, pests and diseases is a tough task, said Jim Gilreath, an associate professor at the Gulf Coast Research and Education Center on Caruso Road.
"We could put a combo together to kill all three problems but that's difficult. This also means adding more stuff to the environment," Gilreath said.
There are several alternatives that Gilreath and other researchers are looking at, but all have weaknesses that need fine-tuning or simply more testing.
"We'd like to find more than one alternative for growers to use," Gilreath said. "We only had one compound that we've relied on for so long, and nothing lasts forever."
Though farmers greeted the exemption with relief, they are also looking at the prospect of paying more for the chemical next year. Growers pay about $2.80 for a pound of methyl bromide. About 200 pounds of the fumigant is needed to sterilize an acre. Gilreath said the price of methyl bromide has tripled in the past 10 years.
Since the ban on methyl bromide is imminent, Shackelford said he thinks most international chemical companies supplying the fumigant will be clearing their stockpiles.
"No one's going to produce what's going to be banned," he said. "It's all supply and demand and we're running out."
Other countries exempted from the ban include Australia, Belgium, Canada, France, Greece, Italy, Japan, Portugal, Spain, and the United Kingdom.
Silvia
Lim, Bradenton Herald, Tue, Mar. 30, 2004
Representative Spratt has a Tracking Number for this CBIR of 1462.
Percentage Of Imported Fruit and Vegetables
Import share of U.S. food
consumption:
·Tomatoes
- 36
·Citrus
- 13
·Grapes
– 45
·Bell
peppers – 26
·Limes
- 92
·Broccoli
– 90
·Cauliflower
– 72
·Asparagus
– 60
·cucumbers
– 44
·Avocados
– 30
·Melons
– 24
Source:
Jerardo,
Andy. "Import Share of U.S. Food Consumption Stable at 11 Percent."
Economic
Research Service, U.S. Department of Agriculture, FAU-79-01, July 2003.
Give me the luxuries of life and I will willingly do without the necessities. -- Frank Lloyd Wright
Everywhere is walking distance if you have the
time.--Steven
Wright
I have been thinking that I would make a proposition to my Republican friends... that if they will stop telling lies about the Democrats, we will stop telling the truth about them.-- Adlai E. Stevenson
Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information on it. -- Samuel Johnson
The preacher told a man interested in the horse that this horse had been trained in a "religious" way. The horse didn't understand "giddy-up" or "whoa".
The only way to make the horse go was to say, "Hallelujah!" And the only way to make the horse stop, was to say, "Amen!"
The man was pleased with his purchase and
immediately
got on the animal and instinctively said "Giddy up".
The horse just stood there. The man then remembered the preacher's
instructions. "Hallelujah!"
shouted the man. The horse began to trot and off he went. Then horse
began to run.
Soon he was heading toward a cliff. He said "whoa" and nothing happened. Then he remembered that he had to say something religious to make him stop -- but he couldn't remember the word to make the horse stop.
As he was approaching the cliff, he frantically yelled: "Stop" and "Halt!"
The horse just kept going. "Oh, no -- Bible! -- Church! -- Please stop!!" shouted the man. He was getting closer and closer to the cliff edge.
Finally, in desperation the man said a prayer. "Please, dear Lord. Please make this horse stop before I go off the end of this mountain. In Jesus' name, AMEN"
The horse came to an abrupt stop just one step from the very edge of the cliff. Whereupon the man took off his hat and wiped his sweaty brow, and thankfully said..."HALLELUJAH!"
"An intelligent man is sometimes forced to be drunk in order to spend time with his friends." -- Ernest Hemingway
"When I read about the evils of drinking, I gave up reading."-- Henny Youngman
"24 hours in a day, 24 beers in a case. Coincidence? I think not." -- Stephen Wright
"When we drink, we get drunk. When we get drunk, we fall asleep. When we fall asleep, we commit no sin. When we commit no sin, we go to heaven. Sooooo, let's all get drunk and go to heaven!" -- Brian O'Rourke
"Beer is proof that God loves us and wants us to be happy." -- Benjamin Franklin
"Without question, the greatest invention in the history of mankind is beer. Oh, I grant you that the wheel was also a fine invention, but the wheel does not go nearly as well with pizza." -- Dave Barry
Remember "I" before "E", except in Budweiser.
And, saving the best for last, as explained by Cliff Calvin, of Cheers. One afternoon at Cheers, Cliff Calvin was explaining the Buffalo Theory to his buddy Norm.
Here's how it went: "Well ya see, Norm, it's like this...A herd of buffalo can only move as fast as the slowest buffalo. And when the herd is hunted, it is the slowest and weakest ones at the back that are killed first.This natural selection is good for the herd as a whole, because the general speed and health of the whole group keeps improving by the regular killing of the weakest members.
"In much the same way, the human brain can only
operate
as fast as the slowest brain cells.Excessive
intake
of alcohol, as we know, kills brain cells. But naturally, it attacks
the
slowest and weakest brain cells first. In this way, regular consumption
of beer eliminates the weaker brain cells, making the brain a faster
and
more efficient machine. That's why you always feel smarter after a few
beers."
Contributors include: Joel
Allingham/AgriCare,
Inc, Karen Armbrester/SWFREC, Kathy Carbiener /Agricultural Pest
Management,
Jim Connor/SWFREC, Bruce Corbitt/West Coast Tomato Growers, Dr. Phyllis
Gilreath/Manatee County Extension, John Hamilton/Helena Chemical Company,
Fred Heald/Farmers Supply, Sarah Hornsby/AgCropCon, Cecil
Howell/H&R
Farm, Loren Horsman/Glades Crop Care, Bruce Johnson/General Crop
Management,
Dr. Mary Lamberts/Miami-Dade County Extension, Leon Lucas/Glades Crop
Care,
Gene McAvoy/Hendry County Extension, Alice McGhee/Thomas Produce, Jimmy
Morales/Pro Source One, Dr. Gregg Nuessly/EREC, Tim Nychk/Nychk Bros.
Farm,
Chuck Obern/C+B Farm, Teresa Olczyk/ Miami-Dade County Extension,
Darrin
Parmenter/Palm Beach County Extension, Dr. Ken Pernezny/EREC, Dr.
Richard
Raid/EREC, Dr. Pam Roberts/SWFREC, Dr. Nancy Roe/Farming Systems
Research,
Wes Roan/6 L's, Kevin Seitzinger/Gargiulo, Jay Shivler/ F& F Farm,
Kevin Short/Integrated Crop Management, Ken Shuler/Stephen’s Produce,
Ed
Skvarch/St Lucie County Extension, John Stanford/LNA Farm, Mike
Stanford/MED
Farms, Dr. Phil Stansly/SWFREC, Julie Stocker/Diamond R, Eugene
Tolar/Red
Star Farms, Dr. Charles Vavrina/SWFREC, Mark Verbeck and Donna
Verbeck/GulfCoast
Ag, Alicia Whidden/Hillsborough County
Extension,
and Dr. Henry Yonce/KAC Agricultural Research, Inc.
The SW Florida Pest and Disease Hotline is compiled by Gene McAvoy and is issued on a biweekly basis by the Hendry County Cooperative Extension Office as a service to the vegetable industry.
Gene
McAvoy
Extension
Agent III
Regional
Vegetable/
Horticulture
863-674-4092 phone
Hendry County
Extension
Office
239-860-8811 mobile Nextel agnet 28950
PO Box
68
863-674-4097 fax
LaBelle, FL
33975
GMcAvoy@mail.ifas.ufl.edu
The Institute of Food and
Agricultural
Sciences is an Equal Employment Opportunity - Affirmative Action
Employer
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services
only to individuals and institutions that function without regard to
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