Document 14816602

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The University of Maryland Extension Agriculture and Food Systems and Environment and Natural Resources
Focus Teams proudly present this publication for commercial vegetable and fruit industries.
Volume 6 Issue 6
September 11, 2015
Vegetable Crop Insect
Update
By Joanne Whalen
DE Extension IPM
Specialist
jwhalen@udel.edu
Cole Crops
Continue to sample for
cabbage looper, diamondback larvae, beet and fall
armyworms and Harlequin bug. Although the pyrethroids
will provide control of Harlequin bugs they are not
effective on beet armyworm or diamondback. Be sure to
scout and select controls options based on the complex
of insects present in the field.
Lima Beans
Continue to scout for stink bugs, lygus bugs, soybean
looper and corn earworm. If present in the mix, be sure
to select a material labeled for soybean loopers.
Melons
Continue to scout all melons for aphids and cucumber
beetles and rind feeding caterpillars. Treatments for
aphids should be applied before populations explode and
leaf curling occurs. In addition, be sure to read the label
regarding when a penetrating surfactant is needed in
order to achieve effective control.
Peppers
At this time of year, aphids, corn borer, corn earworm,
beet armyworm and fall armyworm are all potential
problems in peppers. Be sure to select the material that
will control the complex of insects present in the field.
Spinach
Webworms and beet armyworms moths continue to be
active at this time and controls need to be applied when
worms first hatch and before they have moved deep into
the hearts of the plants. Also, remember that both
insects can produce webbing on the plants. Generally, at
least 2 applications are needed to achieve control of
webworms and beet armyworm.
Available at:
https://extension.umd.edu/sites/default/files/_docs/IPMGui
deVegetables2009.pdf
Gold Flecking on Tomatoes
By Jerry Brust
Extension IPM Vegetable Specialist
University of Maryland
jbrust@umd.edu
“Why do I still have gold fleck on my tomatoes when I
have sprayed repeatedly for thrips? I must have a
resistant thrips population.” I have heard growers tell me
this a few times this year. When I ask why they think
they have a thrips problem since they usually tell me
they do not see any thrips it is because of the gold
flecking (fig 1) they see on their tomatoes at harvest.
While gold fleck on tomatoes can be caused by a
moderately high thrips population, at this time of year
the explanation of the cause of flecking is more likely
due to the weather conditions we have been having. I
have conducted research and read many other studies
on gold flecking over the last 5 years and they all point
to 3 main possible causes. The most likely and common
one is when we have high daytime (>88oF) and
nighttime (>68oF) temperatures combined with high
humidity (dew point temperatures >68o F) and that is
what we are experiencing now and have been from July
through August. The second most common cause is high
populations of either two spotted spider mites (more
common) or thrips (less common) feeding on the plant.
High populations are when the mites or thrips feeding on
the leaves cause white speckles (stippling) on the leaves
Local Governments • U.S. Department of Agriculture
It is the policy of the University of Maryland, College of Agriculture and Natural Resources, Maryland Agricultural Experiment Station, and University of
Maryland Extension that all persons have equal opportunity and access to programs and facilities without regard to race, color, gender, religion, national origin,
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Fig. 2 Moderate flecking on tomato leaves caused by twospotted spider mite feeding.
of a plant (figs 2 and 3). Sometimes the damage
becomes so bad that the edge of a leaf will turn brown
and die because of the feeding (fig 4).
Fig. 1 Gold flecking on red round and plum tomatoes.
Fig. 3 Heavy feeding damage on tomato leaves caused by twospotted spider mite feeding.
Fig. 4 Very heavy TSSM feeding on a tomato leaf.
Gold flecking is not from direct mite or thrips feeding
on the fruit itself—it can’t be because gold flecking can
be induced in tomatoes with no thrips or mites being
present with high temperatures and humidity. Mites and
thrips CAN feed directly on tomato fruit and this damage
can superficially look like gold flecking. But the actual
‘fleck’ in gold flecking is caused by calcium salt crystals
that form inside a cell. Mites or thrips damage the fruit to
get at the juices and leave damaged cells behind (fig 4).
If you rub you finger or thumb lightly over gold flecked
fruit it will feel smooth, but rub it over thrips or mite
damaged fruit and it feels rough. At times if mite
populations are high you could get both gold flecking and
direct mite feeding on a single fruit. The third possibility
that is pretty rare for field production tomatoes is
excessive levels of calcium and phosphorous, but these
levels have to be extremely high and rarely if ever occur
under field conditions. They do occur, though, at times in
hydroponic production systems where gold flecking is
considered more of a nutrient imbalance. This is just a
quick summary of the work that has been done on this
very difficult-to-pin-down problem.
So if you have been spraying for thrips because of gold
flecking and you are still seeing it, STOP SPRAYING and
check for 1. Thrips and 2. Two-spotted spider mites. You
might find a few of each of these, especially the mites as
they like hot dry weather, exactly what we have been
having, but look at the foliage to see if there is white
speckling over most of the middle and top half of the
plant. If it is mites Oberon or Portal (both have a 1-day
phi) or Acramite (with a 3-day phi) can be used. But
chances are you have only low levels of either of these
two pests and it is more likely because of our weather
conditions that you continue to see gold flecking on your
tomatoes.
2
Fig. 5 Comparison of gold flecking on the left and mite or
thrips feeding on the right.
Botrytis impacts are not
Sour rot of grapes.
typically severe unless you
get a lot of infested fruit,
which can provide secondary
inoculum to infect new fruit.
We manage for this by
applying bloom-time sprays
to protect flowers (which are
the most susceptible) and
reducing humidity in the
canopy through thinning, but
this will not control the
disease if berries become
wounded during an infection
period, since the pathogen easily enters fruit through
wounds. Sour rot in grapes is primarily a woundmediated pathogen, and wound-management is one of
the primary strategies to manage this disease. Wounds
can be caused by mechanical injury (rubbing, sun
damage) or by insects. In small fruits, spotted wing
drosophila (SWD) is one new candidate on the scene
that is capable of wounding fruit. SWD makes wounds as
it lays its eggs, and this may facilitate fruit rot
development if not kept in check. For a review of SWD
management, please see the recent special alert article
(special alert #2—July 10, 2015) in the UMD Vegetable
and Fruit Headline News.
Two of Our Least Favorite Fall Pest
Problems May be Consorting
Together: Fruit Rot and Spotted
Wing Drosophila in Fall Berries
By Cassandra Swett,
Department of Plant Science and Landscape Architecture
University of Maryland
We are conducting studies
at the University of Maryland
to evaluate whether SWD
activity can facilitate
outbreaks of Botrytis fruit rot
in fall raspberries and
facilitate both Botrytis and
sour rot in grapes in the midAtlantic. In raspberries, we
are trapping SWD at
moderate to high levels, we
have confirmed larval
infestation in fruit, and we
have found SWD larvae in Botrytis infected fruit (arrow),
indicating that SWD may initiate fruit rot development.
Studies are underway to better understand the
importance of this potential association.
In grapes, studies in other regions indicate that SWD can
initiate sour rot development, and may play a similar role
in facilitating Botrytis fruit rot. SWD was present and
moderate to high levels in vineyard monitoring trials this
year, but we are currently working to see if we can
confirm larval infestation in grapes. SWD is likely only
able to attack very thin-skinned grape varieties
(penetration force of less than 40cN). Botrytis and sour
rot are just starting to appear in most vineyards our
region, and we will be looking to see if there is an
association with SWD.
clswett@umd.edu
&
By Kelly Hamby
Department of Entomology
University of Maryland
kahamby@umd.edu
Warm rains in the spring and some rains and heavy
dews in late summer have made this a bad year for
insects and fruit rots, and we continue to see problems
going into fall in berry crops. The main fruit rot issues
are currently Botrytis in raspberries, and both Botrytis
and sour rot in grapes. We have reason to suspect that
insects, particularly spotted wing drosophila, may be
contributing to the severity of fruit rot damage we are
seeing this fall.
Botrytis fruit rot on raspberries and grapes.
For more information and updates, please refer to the UMD
Berry Pathology Twitter site at:
https://twitter.com/berry_pathology
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How Late is Too Late for
Pumpkins to Color?
and 0-day PHI. The amount of chlorothalonil in Zing! is
an intermediate rate (1.18 lb/A chlorothalonil) of the
labeled rate range for downy mildew in products with
just chlorothalonil (1.125-1.5 lb/A). Chlorothalonil is
labeled for use at a higher rate (1.5-2.25) to manage
several other diseases including powdery mildew.
Growers trying to manage these diseases as well as
downy mildew should apply additional Bravo to bring the
amount of chlorothalonil up to the higher rate. This
necessitates applying Bravo at less than lowest labeled
rate. It is acceptable to apply a pesticide at less than
labeled rates for agricultural purposes only, unless the
labeling specifically prohibits such use. There is not a
prohibiting statement on the Bravo label. To obtain an
application rate of 1.5-2.25 lb/A chlorothalonil, tank mix
Bravo WeatherStik at 0.43-1.43 pts/A with Zing!. Zing! is
labeled for use at 36 fl ozs/A; maximum seasonal use is
8 applications with no more than 2 sequential
applications permitted before it must be alternated with
another fungicide.”
By Gordon Johnson
DE Extension Vegetable & Fruit Specialist
gcjohn@udel.edu
Delayed fruit set in pumpkin can be caused
by many factors including late planting,
heat and water stress, poor pollination
and excess fertility (too much N).
When set is delayed until August, the
question is will the pumpkin develop
and color in time for sales.
Under favorable summer growing
conditions pumpkins will start to color about 4 weeks
after fruit set and will be completely colored by 7 weeks
after set. If fruit set is delayed until August, reduced day
lengths and cooler temperatures may increase the time
for full color development. Varietal differences in days to
maturity also come into play.
In research at Purdue University, pumpkins that set in
August were tagged and then evaluated for maturity in
October. They found that for flowers that opened
between August 10 and August 21, at least 70%
produced pumpkins that were either turning or fully
orange by October 2 and 10, respectively. The remaining
20 to 30% either never set a fruit, or the fruit was still
immature at the time of harvest.
By Stanton A. Gill
Extension Specialist in IPM and Entomology
University of Maryland Extension
Sgill@umd.edu
www.Extension.umd.edu/ipm - IPM Alerts
This indicates that pumpkins set in mid-August will be
ready for October sales. In fields with delayed set, it will
be critical to keep vines healthy through September. This
will mean additional fungicide sprays through the month
with special attention being paid to powdery mildew and
downy mildew.
Sept 11, 2015
Hot and Droughty Continues
Two weeks ago I wrote that NOAA is predicting a
hotter and drier than normal September and it looks like
their prediction was “on the money.” On Labor Day
Monday I was mountain biking on the canal from Seneca
Lake to Great Falls to look at the ripening of Paw Paws. I
was surprised on how stressed the Paw Paw trees looked
along the canal. Many of the leaves were showing leaf
scorch from the extended dry weather. Yes, some of the
wild Paw Paw are ripening but I saw several that were
dropping prematurely from the dry conditions.
This weather is great, with all of the sunshine, but it will
make watering of new transplants this fall very
challenging. Keep the water coming, especially with
trickle irrigation systems, until the weather breaks.
Fungicide Product News
Kate Everts
Vegetable Pathologist
University of Delaware and University of Maryland
keverts@umd.edu
ZeroTol 2.0 is a hydrogen dioxide and peroxyacetic
acid product that has been added to the OMRI products
list. ZeroTol is a broad-spectrum bactericide/fungicide
that is registered to manage plant pathogens on
greenhouse-grown fruits, vegetables and herbs.
Hot Weather and Mite Activity
We have gone most of the summer without reporting
on spider mites. From April through July we had frequent
enough rain storms that suppressed most mite
populations. The outcome has been that we saw just a
few isolated cases in nurseries and landscapes in the first
¾ of the summer. Now that we have moved into hot and
dry weather the spider mite populations are flourishing.
We are finding two-spotted spider mites on a wide range
of plants including many herbaceous perennials. Adults
of two-spotted spider mites have two dark spots on the
body. Southern red mites are being found on mainly
Meg McGrath at Cornell provided the following
information on a new product, Zing!, that may be useful
for managing fall cucurbits: “Zing! is a new fungicide that
has the same active ingredient with targeted activity for
oomycete pathogens as Gavel but is applied at a slightly
higher rate (0.2 lbs/A zoxamide versus 0.12-0.17 lbs/A
with an application of Gavel, depending on the rate
used). Both fungicides also contain a protectant. Gavel
contains mancozeb and thus has 48-hr REI and 5-day
PHI. Zing! contains chlorothalonil and thus has 12-hr REI
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oriental holly species. Southern red mites are reddish
brown and darker than most red spider mites found on
woody ornamentals. The southern red mite is usually
active in spring and again in the late summer when we
start to have cool nights and warm days. The southern
red mite can also be found on boxwood, hibiscus and
cotoneaster.
Monitoring: Use a light colored paper on a clipboard
and place it under branches and tap them sharply. The
mites, if present, should be easily seen running around
on the light colored surface.
Control: There are several products labeled for mite
control including Akari, Aza-Direct, Abamectin (Avid), and
Forbid.
but it had cut their losses tremendously. I think this
disruption pheromone has potential for use in Maryland
nurseries that are troubled with peachtree borer in
cherry laurel, peaches or ornamental plums. If you want
to work with me in 2016, contact me at sgill@u,md.edu
or 410-868-9400.
I have been using the Isomate pheromone dispensers
for oriental fruit moth and codling moth in my orchard
since 2011 and I have experienced very little damage
from either of these pests. The scout at Hollabaugh’s
orchard said they had been using the oriental fruit moth
and codling moth disruption pheromone for over 7 years
and it was very effective in reducing their damage from
these two pest. The use of disruption pheromones would
be best done in a nursery setting. I don’t think it would
be as cost effective in a residential landscape, but I could
be wrong.
Using Disruption Pheromones
Last week I mentioned I would talk about using
disruption pheromones to deal with certain insects. Back
in late spring I wrote an article about controlling the
peachtree borer in cherry laurel. With the growing
popularity of cherry laurels we have seen a large
increase in damage form peachtree borer. Robin Rosetta,
Oregon University Extension, picked up on my article and
sent me an e-mail saying that they had been working
with a nursery in Oregon that was trying to control
peachtree borer with disruption pheromones.
Pheromones are airborne chemicals which are emitted to
attract the opposite sex. Pheromones are believed to be
detected on an instinctual, subconscious level. In other
words, you don’t know that you’re receiving them.
There is a commercial product called Isomate which is an
insect pheromone that is impregnated into a plastic stick
with a metal core called a twist tie. The plastic twist tie is
twisted around tree branches at approximately 4 to 10 ft
high and about 9 ft apart in the nursery. The twist tie
emits pheromone for 120 -180 days. The pheromone
twist ties come containing chemicals that mimic the
naturally produced pheromone of the female insect
species. Isomate is a brand name for several different
pheromones for specific insect species. We have used
the twist ties for peachtree borer and another for oriental
fruit moth.
Helping out Pollinators
To help out pollinators we need to think what we can
use in the nursery and landscape that will provide a good
food source. Good food sources helps increase the health
of pollinators. For the last 5 years I have written several
articles about a spectacular plant called the seven son
plant, Heptacodium miconiodes. I first saw this plant in
2002 when I was giving a talk in Chicago at the Morton
Arboretum. They called it the mid-west substitute for
crape myrtles. It blooms with beautiful white blooms in
mid-August to mid-September. I have several planted at
my farm in Westminster that I trained into small tree
form of about 15 ft. height. For the last 3 weeks
honeybees, wasp, and pollinating flies have been
hanging out on these flowers. There is so much buzzing
going on around the trees it sounds like an electric substation. This plant is an excellent pollen source for
pollinators and for predators to obtain nectars during
part of the year when there is not an abundance of
sources available. I would highly recommend using this
plant to help diversify a landscape and help out the
pollinators
I obtained peachtree disruption pheromone from
Isomate Company this spring. The nursery that was
planning to work with us on this project made an
application of an insecticide that would negate our
measuring its impact. I decided to deploy the pheromone
at my orchard in Westminster since I suffered damage
on cherry and plum trees with 21 trees hit with
peachtree borer in 2014. The Isomate disruption
pheromone was placed out in early June covering two
acres of growing area. I just finished examining the trees
on August 16 and found 3 peachtree borer hits on the
trees in 2015.
CDMS:
Pesticide Labels and MSDS On-Line at:
http://www.cdms.net/
I spoke with the IPM scout from Hollabaugh Orchard in
Biglerville, PA and he said they had been using the
peachtree disruption pheromone for over 3 years and
they had dramatically reduced the incidence of peachtree
borer damage in their orchard. He said it was expensive,
5
The Maryland Rural Enterprise
Development Center (MREDC)
records from the past year. Additionally, any beginning
farmer and rancher may qualify by using the former farm
operator's federal farm tax records if the beginning
farmer or rancher assumes at least 90 percent of the
farm operation
•
Livestock Producers – RMA removed the previous
cap that limited participants to those who received 35
percent or less of their income from livestock production.
Producers will now be able to insure up to $1 million
worth of animals and animal products.
•
Expanding Operations – RMA increased the cap
on historical revenue for expanding operations to 35
percent from its previous 10 percent to better allow
growing farms the opportunity to cover their growth in
the insurance guarantee.
AG Marketing Alert!
Please see the link below on the following
information/application for the 2015 CSX Sm all Grants
P rogram for Transporting Healthy Food.
http://www.conservationfund.org/images/partner/files/2015_CSX_Small
_Grants_Program_Application.pdf
Ginger S. Myers
Marketing Specialist, University of Maryland Extension
Director, Maryland Rural Enterprise Development Center
VOICE: 301-432-2767 Extension: 338
FAX: 301-432-4089
EMAIL: gsmyers@umd.edu
Whole-Farm Revenue Protection includes a wide range
of available coverage levels, provides coverage for
replanting annual commodities, includes provisions that
increase coverage for expanding operations, and allows
the inclusion of market readiness costs in the coverage.
The policy is tailored for most farms, including farms with
specialty or organic commodities (both crops and
livestock), or those marketing to local, regional, farmidentity preserved, specialty, or direct markets. The
policy covers farms or ranches with up to $8.5 million in
insured revenue.
USDA Expands Farm Safety Net,
Offers Greater Flexibility for
Beginning, Organic and Fruit and
Vegetable Growers
For more information, including product availability,
visit the RMA Whole-Farm Web page. Crop insurance is
sold and delivered solely through private crop insurance
agents. A list of crop insurance agents is available at all
USDA Service Centers and online at the RMA Agent
Locator. Learn more about crop insurance and the
modern farm safety net at www.rma.usda.gov
Whole Farm Coverage Now Available in Every
County Across the Nation
Agriculture Deputy Secretary Krysta Harden today
announced that Whole-Farm Revenue Protection
insurance will be available in every county in the nation
in 2016. The U.S. Department of Agriculture (USDA) is
also making changes to the policy to help farmers and
ranchers with diversified crops including beginning,
organic, and fruit and vegetable growers, better access
Whole-Farm Revenue Protection.
The University of Maryland Extension Woodland
Stewardship Education program serves woodland
owners, natural resource professionals and interested
citizens. Please consider attending one of these offerings.
Additional events are listed on the Event Calendar at
http://extension.umd.edu/woodland
"Whole-Farm Revenue Protection insurance allows
producers who have previously had limited access to a
risk management safety net, to insure all of the
commodities on their farm at once instead of one
commodity at a time," said Deputy Secretary Krysta
Harden. "That gives them the option of embracing more
crop diversity on their farm and helps support the
production of a wider variety of foods."
Nature-based Forestry: The Pro Silva Movement in
Europe – September 17, 2015, 12:00 pm – 1:00 pm,
online
USDA also provided additional flexibility to producers by
making the following changes, including:
•
Beginning Farmers and Ranchers – RMA makes it
easier for more beginning farmers and ranchers to
participate in the program by reducing the required
records from five to three historical years, plus farming
The next presentation in our WSE Webinars series
features Lyle Almond, University of Maryland Forest
Stewardship Educator. Lyle will provide an overview of
the “Pro Silva” movement that is sweeping across the
continent. It promotes continuous cover forestry, which
6
mimics natural forest stand development for optimizing
social, ecological, and economic benefits. The webinar
will include Lyle’s first-hand experience with the
movement through his work in the nation of Slovenia.
This webinar is free and will be conducted through
Adobe Connect. Registration is requested. To register, go
to: http://woodlandwebinarsprosilvamovement.eventbrite.com.
Secretary Bartenfelder Announces Record Cover
Crop Enrollment
Visit our website: http://extension.umd.edu/woodland
During the Governor’s Agriculture Day lunch at the
134th Maryland State Fair, Maryland Department of
Agriculture Secretary Joe Bartenfelder announced record
cover crop program enrollment by Maryland farmers as
he applauded the agriculture community for their
extraordinary stewardship efforts.
For the 2015/2016 Cover Crop Program, 1,835
Maryland farmers requested funding to plant a record
656,170 acres of winter grains. Maryland farmers have
exceeded the Watershed Implementation Plan milestone
goals in 2011, 2013 and 2015 for cover crops and are on
track to exceed the next two year milestone in 2017 with
this new record enrollment acreage. Cover crops are one
of the most cost-effective means of helping to restore
the Chesapeake Bay. The State has allocated $22.5
million for the 2015/2016 program, which is estimated to
pay for every certified planted acre in program.
Agricultural Law Education Initiative
http://umaglaw.org
The Potential Impacts of Mandatory
Labeling for Genetically Engineered
Food in the United States
“The State Fair is a chance to remind ourselves of our
roots and to see the work that Maryland farmers are
doing to create jobs, strengthen our economy, and feed
our families. Agriculture contributes $8.25 billion annually
to our state and the future of agriculture and our rural
economies is strong,” said Governor Hogan. “Our record
cover crop announcement is great news for our farmers
who continue to voluntarily take strong conservation
actions on their farms, diversify their operations and use
new technologies as they become available.”
“Not only is Maryland’s cover crop program a very
attractive and flexible program, it has the potential to do
more for the Bay than ever before,” said Agriculture
Secretary Bartenfelder. “We commend and thank all
farmers who, together, have applied to plant more than
half a million acres of small grain crops that protect our
soil and water by taking up any remaining nutrients and
preventing soil erosion over the winter.”
http://www.castscience.org/publications/?the_potential_impacts_of
_mandatory_labeling_for_genetically_engineered_f
ood_in_the_united_states_qc&show=product&prod
uctID=282272
For a chart showing cover crop acres and applications, 2007 to
2015:
http://www.mda.maryland.gov/resource_conservation/Docu
ments/CC_2015_Poster.pdf
For enrollment statistics by county, visit:
www.mda.maryland.gov/resource_conservation/Documents/c
c_by_county15.16.pdf
7
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laws on the sale and use of pesticides, and
investigates pesticide accidents or incidents and
consumer complaints on pesticide misuse.
Commercial 2015
Vegetable Production
Recommendations
Maryland EB 236
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egRecommend_MarylandBook.pdf
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8
Rescheduled:
2015 Aronia
Twilight Tour
September 17th
Subscribe to the Terp Farm
Newsletter!
We'll be sending monthly updates of what we're up
to at the Terp Farm - thanks for following along!
Terp Farm Newsletter Subscription
The 2015 Aronia Twilight Tour has been
rescheduled for Thursday, September 17th at 5 PM at the
Wye Research and Education Center in Queenstown, MD.
This twilight tour will be focused on useful information
for both new farmers interested in growing Aronia and
for veteran Aronia growers.
Whether you are organic or conventional, a veteran
Aronia grower or just interested in possibly growing
Aronia, this is a program you do not want to miss!
RSVP by calling Debby Dant at 410-827-8056 x
115 or Linda Dawkins, x 114.
Vegetable & Fruit News
A timely publication for the commercial vegetable and
fruit industry available electronically in 2015 from April
through October on the following dates: April 16; May 14;
June 11; July 9; August 13; September 11; and October 22.
Published by the University of Maryland Extension
Focus Teams 1) Agriculture and Food Systems;
and 2) Environment and Natural Resources.
Submit Articles to:
Editor,
R. David Myers, Extension Educator
Agriculture and Natural Resources
97 Dairy Lane
Gambrills, MD 21054
410 222-3906
myersrd@umd.edu
Article submission deadlines for 2015 at 4:30 p.m.
on: April 15; May 13; June 10; July 8; August 12; September 9; and
October 21.
The University of Maryland Extension programs are open to
any person and will not discriminate against anyone because of
race, age, sex, color, sexual orientation, physical or mental
disability, religion, ancestry, national origin, marital status,
genetic information, political affiliation, and gender identity or
expression.
Note: Registered Trade Mark® Products, Manufacturers, or Companies
mentioned within this newsletter are not to be considered as sole
endorsements. The information has been provided for educational
purposes only.
9
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