for Arborists, Landscape Managers & Nursery Managers

Commercial Horticulture June 20, 2014Coordinator Weekly IPM Report: Stanton Gill, Extension Specialist, IPM for Nursery, Greenhouse and Managed Landscapes, sgill@umd.edu. 301-596-9413 (office) or 410-868-9400 (cell)

Regular Contributors: Pest and Beneficial Insect Information: Stanton Gill and Paula Shrewsbury (Extension Specialists) and Nancy Harding, Faculty Research AssistantDisease Information: Karen Rane (Plant Pathologist) and David Clement (Extension Specialist)Weed of the Week: Chuck Schuster (Extension Educator, Montgomery County)Cultural Information: Ginny Rosenkranz (Extension Educator, Wicomico/Worcester/Somerset Counties)Fertility Management: Andrew Ristvey (Regional Specialist, Wye Research & Education Center)Design, Layout and Editing: Suzanne Klick (Technician, CMREC)

In This Issue...

If you work for a commercial horticultural business in the area, you can report insect, disease, weed or cultural

plant problems found in the landscape or nursery to

sklick@umd.edu

TPM/IPM Weekly Report

June 21 – The Longest DayBy: Stanton GillIt is hard to believe it, but we have reached the longest day of the year and the start of summer. So far, this spring has been described by many people as “interesting”. We are still recouping from a terribly cold winter and there are still many dead branches on plant species that suffered from the January -7 to -8 °F weather. It is one of the wettest, coolest springs we have seen for years. Nursery owners are reporting record amounts of new growth on their trees from the frequent rain storms. The landscape and nursery industry is reporting robust sales this spring, but with all of the rain it has been difficult for everyone to get all of their work done.

As we move into the summer we will see if it turns hot and stressful or we might get lucky and continue with a cool summer. Several of the long range weather predictors have called for a cooler summer. Let’s hope this is true.

- Start of summer- Japanese beetles- Oriental beetles- Brown marmorated stink bug update- Pink patch and brown patch in turf- Fall webworm- Fourlined plant bugs- Greenstriped mapleworm- Tobacco rattle virus- Oak lecanium scale and scale update- Wool sower gall on oak- Emerald ash borer- Bagworms- White pine weevil- Winter damage- Termites swarming- Turf fertilizer applicators- Wheel bugs

Beneficial of the WeekWeed of the WeekPlant of the WeekPhenologyDegree DaysAnnouncements

IPMnetIntegrated Pest Management for

Commercial Horticulture

extension.umd.edu/ipm

Cercis canadensis The Rising SunTM is a redbud with new growth that starts orange and yellow and then eventually turns green

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Adults Japanese beetle activity is just getting started in the area this week

Japanese Beetle EmergenceBy: Stanton GillIn March of 2014 I wrote an article predicting that Japanese beetles would be emerging in June of 2014 and would do so in a “big way”. In the summer of 2013, last July and the beginning of August, we had regular rains with high soil moisture. These moisture levels allowed a large number of eggs to survive in the soil. In droughty years the larval survival is low due to desiccation of eggs. Since it was wet at the critical time last summer, large numbers of white grubs survived in the turf areas. They have pupated and now we will have large numbers of adults emerging from the soil over the next 4 – 6 weeks. Andrew Ristvey reported adult activity in Talbot County on Monday. On Tuesday we received a report of adult Japanese beetle activity in the Salisbury area from Ginny Rosenkranz. We found them on Wednesday on plant material at the Central Maryland Research and Education Center in Ellicott City. Control: It is rather important to control damage on plants early. Once a plant is fed upon it gives off volatiles that attract additional beetles to the feeding site. Seven years ago we tested azadiracthin formulations from Certis Company. The product is sold under the name Azatin XL, and is the one that was used in our test. We tested 3 rates ranging form 6 – 14 oz/100 gallons of water. At the 14 oz/100 gallon rate we were able to keep Japanese beetle adults from feeding on zinnia for 3 - 4 days. A new insecticide we tested out last year, Acelepyrn, gave control of adult Japanese beetles for 2 – 3 weeks. Beetles have been added to the new 2ee label on Acelepryn. Foliar applications of carbaryl or bifenthrin will give control, but both materials are a little harsh on beneficial organisms. If using these products, keep applications concentrated on the susceptible plants and avoid applying to the rest of the landscape.

Oriental BeetlesOriental beetle activity is also getting starting. Douglas Eller is finding oriental beetles in Cecil County. We have seen a few here in Ellicott City. The larvae (grubs) feed on roots of woody plants and perennials in nurseries and on turf in the landscape. Adults can cause some damage to flowers, but flower damage does not seem to be significant.

Oriental beetle that landed on a window screenPhoto: Douglas Eller

Maryland Department of Agriculture Pesticide Container RecylingMDA has a brochure on the dates and details of the pesticide container recycling program which is available

at: http://mda.maryland.gov/plants-pests/Documents/recycle.pdf

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This mid-instar BMSB nymph was found on coleus

What’s Happening with the Brown Marmorated Stink Bug?Stanton GillDid you ever wonder what happened to all of the brown marmorated stink bugs? Remember 2011 and 2012 when they were everywhere? Yeah, sure they are still lingering around in a couple of houses, but most people are reporting they just are not a big problem in their houses or gardens this season. There was a good number overwintering in houses this winter, but the late cold, spring has delayed their movement to the outside this year and many people are reporting they are finding them dead in their houses – as if they just ran out of energy. In many landscapes we found many of our well established predators feeding on brown marmorated stink bugs. Several parasitic wasps have also been found attacking different life stages of the bug. Many people are reporting seeing several species of birds feeding on the bugs. This predator acitivty and the strange spring weather appear to be combining to help keep this pest suppressed in several areas in Maryland. There are still a few hot spots like areas in Frederick and Washington Counties. Many of the orchards in these counties are seeing a fair amount of damage on peaches, pears, plums and apples. The BMSB has also become established in northern Italy and parts of Milan and Torreno, parts of France, and Switzerland. It has also been found in Hungary.

This week I attended a conference organized by USDA at the University of Delaware Research Center in Georgetown, Delaware to find out what is the latest research on brown marmorated stink bugs. The bug has been on the move. It is now getting established in southern California and in the agricultural areas around Sacramento. This is a big concern since it has the potential to become a hugh problem in orchards, vineyards and vegetable production areas. California produces 90% of the almonds for the world and BMSB feeds heavily on a close cousin of the almond tree – the peach. It is suspected that it will become a problem for almond growers.

One of the questions that has come up is how cold winters impact the brown marmorated stink bug. Theresa Cira, University of Minnesota, reported on this pest in Minnesota. The winter temperatures in northern Minnesota reach -35 °F and -25 °F in southern Minnesota this past winter. She reported that BMSB survived the frigid Minnesota winter by using special proteins to regulate the way their body freezes and minimize damage to cells. A rapid freeze down of the insects kills it, but a gradual freezing is something this insect species is built to withstand.

On the parasite research end, Tim Hayes of CABI, has been looking at the parasitic wasp, Trissolus japonica. Dr. Hayes has been looking at this parasite in mulberry and jujube orchards in China just outside of Beijing. He found that this species of wasp can parasitize up to 50% of the egg masses of BMSB.

If you are seeing a lot of activity from brown marmorated stink bugs in your area, let me know at sgill@umd.edu or 410-868-9400. We would like to see if there are hotspots in Maryland where this bug is very active.

First instar BMSB right after they have hatched

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Pink Patch and Brown Patch DiseasesMark Schlossberg, ProLawn Plus, Inc., is reporting that pink patch disease is active in turf this week. This disease is very similar to red thread and will be less of a problem as temperatures rise. It is time to start looking for brown patch disease. Daytime temperatures at or above 85º, nighttime temperatures above 68º, and high relative humidity are conditions that favor this disease. Brown patch is most severe in tall fescue, perennial rysegrass, and bentgrass. For more inforomation on identification and management of brown patch disease, go to University of Maryland Turfgrass Technical TT-15 (June 2011).

Pink patch in turfPhoto: Mark Schlossberg, ProLawn Plus, Inc.

Brown patch throughout a turf areaPhoto: Mark Schlossberg, ProLawn Plus, Inc.

Fall WebwormsWe are receiving steady reports this week of fall webworm activty. Jessica Frakes, Thrive, Inc., found larvae on redbud in Leesburg on June 17. Connie Bowers found caterpillars and tents on June 15 on Prunus trees, Cornus kousa, and crabapples in Silver Spring. Richard Chaffin, The Brickman Group, is reporting that they are abundant on many types of trees this week in Baltimore County. Steve Clancy, Town Creek Landscaping, found them feeding and making webs on Kwanzan cherry on June 19. Fall webworm has a wide host plant range. The larvae feed within the webbing they produce. There are two generations per season. There are two color forms of the caterpillar: one that is yellowish white with a black head and one that is brown with a red head.Control: If possible, prune out webbed terminals. Bt, horticultural oil or insecticidal soap can be used for early instars. There are many predators and parasites that help keep this pest below damaging levels

Fall webworm caterpillars feed gregariously within their webbingPhoto: Richard Chaffin, The Brickman Group

Webbing on tips of Cornus kousa branches is caused by fall webwormsPhoto: Connie Bowers, Garden Makeover Company

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Greenstriped mapleworm caterpillars were found on red maple this weekPhoto: Nancy Harding, UMD

Feeding initially causes yellow spotting before spots become brown and necrotic

Fourlined Plant BugsConnie Bowers, Garden Makeover Company, is seeing some damage on Ajania pacifica from fourlined plant bugs. This bug causes damage early in the season in May and June. It is finishing up activity at this point. There is only one generation per season. Many plants outgrow the damage.

Greenstriped Mapleworm, Dryocampa rubicundaOn Tuesday, June 17, greenstriped mapleworm larvae were found feeding on Acer rubrum (red maple) in a tree nursery in Central Maryland. This native giant silkworm moth prefers maples especially red maple, sugar maple and silver maple. However, it also feeds on boxelder and oaks especially where grown mixed in with maples. Early stage larvae tend to feed in groups, consuming whole leaves. The head is black and the body yellowish cream with greenish longitudinal lines (lines are sometimes dim in early stage larvae). Late-stage larvae tend to separate and feed singly. The full-grown caterpillar is about 40 mm long. The head is cherry red and the body yellow-green with seven dark-green lines running down the length. There are two conspicuous long black spines on the second segment of the thorax, and two rows of short spines along each side of the body. There are two generations a year.Monitoring: Look for damage on foliage of lower branches of susceptible maples during the months of May and July.Control: Greenstriped mapleworms have been shown to be parasitized by several species of insects, but not in great abundance. Normally, chemical control is not necessary. However, if high populations warrant control use Bacillus thuringiensis or spinosad (Conserve).

The adult of this caterpillar is called the rosy maple moth

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Oak Lecanium ScaleBy: Stanton GillThis week I received a call from a nursery manager who is trying to deal with oak lecanium scale. We reported last week that this soft scale had started producing crawlers. The manger popped a couple of female scale covers over and was amazed at the number of eggs found under individual females. It is easy to see how this scale with its capability to produce eggs can quickly become a major problem in a nursery or landscape. We have had many, many calls and emails this spring reporting lecanium scale in landscapes throughout the Washington and Baltimore metro area.

One thing to keep in mind is that there are many predators that feed on soft scales when they are in the crawler stage. For this reason you want to use a material that kills the scale but has the least impact on the predator populations. I usually recommend the use of Talus or Distance (both insect growth regulators) since they have less impact on beneficials than other broad spectrum materials. Another option is to make a basal trunk spray or soil drench of dinotefuran. This material should uptaken in 2 – 3 weeks. Since it is systemic it will reduce the chance of impacting beneficials running around on the leaves and branches.

TRV symptoms on epimedium which is vectored by root nematodesPhoto: Marie Rojas, IPM Scout

Wool-sower gall is only found on white oaksPhoto: Marie Rojas, IPM Scout

Tobacco Rattle VirusMarie Rojas, IPM Scout, found an epimedium with a very distinctive mottling on the leaves of one plant in a private landscape. The plant is infected with tobacco rattle virus (TRV). This virus is vectored by root-feeding nematodes (Trichodorus and Paratrichodorus).

A Gall on OakThroughout each season we receive photos and reports of various galls on oaks. This week, Marie Rojas, IPM Scout, found wool-sower galls on a white oak. The gall is caused by a small wasp, Callirhytis seminator. Now that the galls are formed, it is too late for control. This gall is rarely abundant enough to threaten the health of the tree.

Scale UpdateMarie Rojas, IPM Scout, examined samples of Japanese maple scale under the scope and found only eggs. Marie also found a couple of hatched cottony camellia taxus scale in the fluff, but many were still eggs and none had moved out of the fluff and onto the leaves.

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Marie Rojas dug into the terminal stem to confirm that white pine weevils were the source of the damagePhoto: Marie Rojas, IPM Scout

John Pond and several others pulled this adult emerald ash borer from a declining ash treePhoto: John Pond, Washington D.C. Urban Forestry Administration

Look at plants closely for the small early instar bagworms

Emerald Ash BorerJohn Pond, Washington, DC’s Urban Forestry Administration, and two UFA coworkers went to sample some declining ash trees last week for evidence of EAB. John noted that the signs of infestation were overwhelming. On June 13, they pulled an adult from a D-shaped hole in the lower crown of the tree. The tree had roughly 40% dieback.

BagwormsMarie Rojas, reported a major hatch out of bagworms on Norway spruce, arborvitae, and Korean fir in Montgomery County on June 17. Control: Applications of Bt or Spinosad (Conserve) should give good control of early instars

White Pine Weevil Marie Rojas found white pine weevil larvae in the tip of a Siberian spruce, Picea omorika. It is a native weevil that feeds on many native and introduced species of pine and spruce. Now is the time to look for stunting, flagging and death of leaders caused by the larvae boring into the stem. Cut into the terminals to be sure the weevil larvae are present and the death of the terminals is not due to disease.Control: Prune out and destroy infested terminals before the weevils turn into adults and move to leaf litterunder trees to overwinter. If weevils are a problem now, consider targeting protection from adults in the earlyspring (~March / April) next year.

A close-up view of a white pine larvaPhoto: Lorraine Graney, Bartlett Tree Experts, Bugwood.org

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Turf Fertilizer Applicators Are you aware that if you spread, apply or otherwise use fertilizer on turfgrass in Maryland as part of your business that you must be licensed? This regulation was signed in 2011 and went into effect October of 2013. It is now late June of 2014 and some questions still exist. 1) If your business applies fertilizer to turfgrass you need to have at least one person licensed per business location. One can learn about the testing locations and process from the MDA website, http://mda.maryland.gov/Pages/fertilizer.aspx, checking on the right side of this webpage one can see testing locations and dates as well as go to the manual itself. This license costs $100.00.2) Once each business location has a licensed individual, then a business license must be obtained. This can only be done after an individual license is obtained. The business license number MDA-F-XXXX will need to be posted on each vehicle that is used to transport fertilizer to a client’s site. The numbers need to be at least 2 inches tall (the same as your pesticide license number) and is different than your pesticide license number. The business license costs $50.00.3) Each technician that is doing fertilizer applications to turf, will need basic training, and will need to be registered with MDA also. The cost for each technician is $15.00.

Trainings are offered by both MDA and University of Maryland Extension. Time is running out for getting all the proper paperwork, licenses and payments made before the deadline is upon the industry and fines are levied. As professionals this is important because the need to be in compliance is part of our responsibility. The turfgrass industry has been very good and has over 1,000 individuals currently holding personal licenses, but I still see many vehicles that do not show proper license information on the vehicle.

If you have any questions on this matter feel free to contact Chuck Schuster (cfs@umd.edu) or Ginny Rosenkranz (rosnkrnz@umd.edu) as soon as possible.

Winter DamageWade Smith in Hellam, PA, reported that his brown turkey fig has just started to grow some shoots from the ground. His crapemyrtles, ‘Dynamite’ and ‘Victor’, have all leafed out. He has seen two ‘Rhapsody in Pink’ crapemyrtles in his neighborhood that have been planted for several years that appear to show no life at this point.

Termites Are SwarmingBrian Scheck, Maxalea, Inc., reported that termites were hatching on June 15 in the Timonium area. Brian noted that there were swarms of them everywhere. Your customers may see these winged adults which are an annoyance, but do not necessarily mean that they have a termite problem. Termites do not have a ‘pinched waist’ like ants. Their wings are sutured and fall off easily. Termites have bead-like antennae and ants have elbow-shaped antennae.

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Beneficial of the Week By: Paula ShrewsburyLong-legged flies (Diptera: Dolichopodidae)We often see these small (~ 1/8 – ¼”) metallic long-legged flies zipping around our woody and flowering ornamental plants. It does not seem like they are really doing much else. However, these beautiful little flies are actually predators. The adults of these “true flies” are often metallic green, blue or copper-colored. They are abundant in many managed and natural habitats, especially near swamps, streams, in woodlands, and meadows. The larvae, which are maggots, are found in varied habitats such as water, mud, decaying wood and grass stems. Little is known about the feeding habits of larvae but some are believed to be predaceous, others are leaf miners in grass stems. Adults are known to be predators of thrips, aphids, larvae of small insects, and mites. I have only been fortunate enough to actually see an adult long-legged fly feeding on prey a few times, once feeding on an azalea lace bug adult, the other time the prey was beyond recognition (see image). Adults are known to feed on an assortment of smaller insects. In addition to being beautiful (for a fly anyway) they also contribute to biological control in our managed ecosystems.

This adult long-legged fly shows the characteristic metallic coloration, long legs, and single pair of wings. This fly has the remains of lunch in its mouth.Photo: P. Shrewsbury

Wheel Bug NymphsWheel bug nymphs are active now. They are black and bright orange or red. These assassin bugs are generatlist predators that feed on a variety of insects in landscapes and nurseries.

Look for wheel bug nymphs in landscapes and nurseries

Weed of the WeekBy: Chuck Schuster, UMEPerennial sowthistle, Sonchus arvensis, is a perennial herbaceous plant that can be found in landscapes, nurseries, and on roadsides. This plant can grow to six feet in total height, has a hollow ridged stem, that when broken emits a milky colored sticky juice that has an unpleasant odor. The root system is a deep diffuse root system that moves both horizontally and vertically in the soil. Roots may extend up to ten feet from the plant and generate new plants at nodes. The roots are brittle and break easily, making mechanical removal extremely difficult. The bright yellow flower will open early in the day, and close often before the early afternoon. These flowers can be two inches in diameter. It is similar in shape to that of a dandelion, and if often misidentified as a dandelion. The bracts on the flower are green with sticky hairs. The seeds produced are tufted and will blow easily in the wind. Leaves on the stem are alternate, occur with pointed lobes and the margins will have sharp hairs. Leaf size decreases and will have fewer lobes farther up the stem from the base.

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Closed and and open balloon flowersPhotos: Ginny Rosenkranz, UME

Prevention is the best method of control. If a plant becomes established, prevent seed head formation. This plant does not respond well to just glyphosate products, and in turf settings glyphosate will destroy the desired species of turf as well. Milestone (aminopyralid) can be used early in the season when the plant is actively growing. Dicamba, triclopyr, and clopyralid have also been shown to have effectiveness.

Perennial sowthistle in flowerOSU Extension Slide Set Archives, The Ohio State University, Bugwood.org

Close-up of perenniall sowthistle stemPhoto: Michael Shephard, USDA Forest Service, Bugwood.org

Plant of the WeekBy: Ginny Rosenkranz, UMEPlatycodon grandiflorus, balloon flower, is an herbaceous perennial that has flower buds that start out looking like small hot air balloons, then as they mature grow larger and larger until they burst open to reveal a star-shaped bright blue flower. The cultivar, ‘Sentimental Blue’ is a dwarf selection that grows 6-9 inches tall compared to the 15-24 inch size of many other cultivars. The blue-purple flowers face upwards and open to 3 inches in diameter and have 5 pointed lobes. The plants themselves are very long-lived and will bloom consistently almost all summer long. They prefer to grow in average, well drained soils in full sun to partial shade. They are cold hardy in USDA zones 3-8 and are in the Campanulaceae or bellflower family. There are no serious insect or disease pests, but balloon flower plants are late to emerge in the spring and damage to the crowns can happen. One solution is to plant spring bulbs like tulips or daffodils to mark their spot. As with many blue flowers, balloon flower highlights yellow flowers and fits into perennial border gardens or rock gardens.

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PLANT PLANT STAGE (Bud with color, First bloom, Full bloom, First leaf)

LOCATION

Asclepias tuberosa First bloom June 15 (Ellicott City)

Degree Days (As of June 19) 2014 2013 2012 Baltimore, MD (BWI) 1084 1072 1350 Dulles Airport 1004 1111 1316Frostburg, MD 593 630 811 Martinsburg, WV 1035 1020 1254National Arboretum 1386 1311 1617 Reagan National 1386 1311 1317Salisbury 1250 1257 1420 St. Mary’s City 1137 1298 1465

To check degree day (DD) accumulations in your local area go to: http://www.weather.com/outdoors/agriculture/growing-degree-days/USMD0100

Note: degree days reported in this newsletter for various pests use the Weather.com web site, a base temperature of 50 °F, a start date of January 1st, and the date of monitoring as the end date.

Professional Fertilizer Applicator Recertificiation SeminarLocation: Maryland Department of Agriculture, Annapolis, MDTime: 9:30 a.m. to 11:30 a.m.

Choose any one of the following dates for recertification:June 23, 2014, August 7, 2014, or September 3, 2014

Seating is limited, register now. Cost: $12, which includes breakfast

See http://mda.maryland.gov/fertilizer for details and registration form (pdf link on right sidebar in section with blue map of Maryland). This program is open only to currently Certified Professional Fertilizer Applicators (turfgrass). Attending one of these seminars satisfies the continuing education requirement for renewing certification for the July 2015 - June 2016 year. Registration with payment is required no later than one week before the class date. For more information, call 410-841-5959.

Montgomery College, Germantown Campus Landscape Technology ProgramSummer Session IILN 141 Beekeeping (2 semester hours)July 8 to August 5, 2014 (6:00 to 9:00 p.m.)For details on cost and how to register, contact Stephen Dubik (240) 567-7803. \Steve.dubik@montgomerycollege.edu

Stanton GillExtension Specialist

sgill@umd.edu

Paula Shrewsbury Extension Specialistpshrewsb@umd.edu

Ginny RosenkranzExtension Educatorrosnkrnz@umd.edu

Chuck SchusterExtension Educator

cfs@umd.edu

Karen Rane Plant Pathologistrane@umd.edu

Andrew RistveyExtension Specialistaristvey@umd.edu

David ClementPlant Pathologist

hgic.umd.edu

The information given herein is supplied with the understanding that no discrimination is intended and no endorsement by University of Maryland Extension is implied.

CONTRIBUTORS:

University of Maryland Extension programs are open to all citizens without regard to race, color, gender, disability, religion, age, sexual orientation, marital or parental status, or national origin.

Thank you to the Maryland Arborist Association, the Landscape Contractors Association of MD, D.C. and VA, the Maryland Nursery and Landscape Association, Professional Grounds Management Society, and FALCAN for your

financial support in making these weekly reports possible.

Photos are by Suzanne Klick or Stanton Gill unless stated otherwise.

Upcoming Conferences

MNLA Field DayJune 26, 2014Location: Roseland Nurseries, Sudlersville, MDmnlaonline.org

Maryland Christmas Tree Association Summer MeetingJune 28, 2014Location: Gaver Tree Farm, 5501 Detrick Road, Mt. Airy, MD 21771Contact:301-865-3515 or gavertreefarm@aol.com

Mid-Season Aronia TourJuly 8, 2014, 5:00 - 7:30 p.m.Location: Wye Research and Education Center, Queenstown, MDContact: Andrew Ristvey, 410-827-8056, aristvey@umd.eduThere is no charge, but you need to register by July 1.

PGMS Green Industry Professional Field DayJuly 17, 2014Location: American University, Washington D.C.Green Industry Field Day Brochure

Virginia/Mid-Atlantic Regional Aquaculture Best Management Practices Training WorkshopJuly 23, 2014 2014 8:30 AM – 4 PM.Location: Hampton Roads Agricultural Research and Extension Center 1444 Diamond Springs Road, Virginia Beach, Virginia.Free, lunch provided. Pre-registration required: Attendance will be limited to first 50 pre-registrants.

To register please contact: Gail Jamison: 1-757-727-4861, gjamison@vt.edu Program components:What are Aquaculture Best Management Practices (BMPs)?; FDA aquaculture regulations, guidelines, and future trends/considerations; State regulators/regulations, and VDACS Fish Health; All about Aquaculture Feeds; BMPs for hatcheries, raceways, ponds, cage culture, hydroponics/aquaponics, recirculating aquaculture systems, harvest and post-harvest handling

PANTS14 - Penn Atlantic Nursery Trade ShowJuly 30-31, 2014Pennsylvania Convention Center, Philadelphiawww.pantshow.com or 732-449-4004

Greenhouse Biocontrol ConferenceAugust 6, 2014 Location: Maritime Institute, Linthicum, MD

Stormwater Management ProgramAugust 20 and 21, 2014

TWO Locations: August 20 - Montgomery County Extension Office, Derwood, MDAugust 21 - Robinson Nature Center, Columbia, MD