RESEARCH &
EDUCATION
CENTERS (REC)
Plant/Pest Common Name | Taxonomic Name | Phenological Event | GDD | Links |
Persian speedwell | Veronica persica | first bloom | 16 | |
Corneliancherry dogwood | Cornus mas | first bloom | 22 | ![]() ![]() |
Red maple | Acer rubrum | first bloom | 34 | |
Border forsythia | Forsythia x intermedia | first bloom | 35 | |
Euonymus leaf-notcher caterpillar | Pryeria sinica | egg hatch | 37 | |
Red maple | Acer rubrum | full bloom | 42 | |
Callery pear (MD Tier 2 Invasive Plant) | Pyrus calleryana | first bloom | 50 | |
Eastern tent caterpillar | Malacosoma americanum | egg hatch | 51 | ![]() ![]() ![]() |
Purple deadnettle | Lamium purpureum | first bloom | 52 | ![]() |
Border forsythia | Forsythia x intermedia | full bloom | 53 | |
Saucer magnolia | Magnolia x soulangeana | first bloom | 59 | |
Star magnolia | Magnolia stellata | first bloom | 89 | ![]() |
Flowering quince | Chaenomeles speciosa | first bloom | 103 | |
Bridal wreath spirea | Spirea x vanhouttei | first bloom | 104 | |
Callery pear (MD Tier 2 Invasive Plant) | Pyrus calleryana | full bloom | 105 | |
Koreanspice viburnum | Viburnum carlesii | First bloom | 117 | |
Sargent's cherry | Prunus sargentii | first bloom | 121 | ![]() |
Sassafras | Sassafras albidum | first bloom | 122 | ![]() |
Bridal wreath spirea | Spirea x vanhouttei | full bloom | 123 | |
Eastern redbud | Cercis canadensis | first bloom | 137 | |
Sassafras | Sassafras albidum | full bloom | 138 | |
Sargent's cherry | Prunus sargentii | full bloom | 140 | ![]() |
Double weeping higan cherry | Prunus subhirtella 'Pendula Plena Rosa' | first bloom | 142 | |
Cherry laurel | Prunus laurocerasus | first bloom | 144 | |
Koreanspice viburnum | Viburnum carlesii | full bloom | 149 | |
Red buckeye | Aesculus pavia | first bloom | 154 | |
Canadian serviceberry | Amelanchier canadensis | first bloom | 154 | |
Eastern redbud | Cercis candensis | full bloom | 156 | |
Fernald’s shadbush | Amelanchier fernaldii | full bloom | 163 | |
Woolly elm aphid | Eriosoma americana | egg hatch | 163 | ![]() |
Nantucket serviceberry | Amelanchier nantucketensis | full bloom | 171 | |
Spiny witchhazel gall aphid | Hamamelistes spinosus | adult/nymph | 171 | ![]() |
Serviceberry 'Autumn Brilliance' | Amelanchier x grandiflora | first bloom | 179 | |
Double weeping higan cherry | Prunus subhirtella 'Pendula Plena Rosa' | full bloom | 195 | |
Mountain pieris | Pieris floribunda | full bloom | 197 | |
White enkianthus | Enkianthus perulatus 'JL Pennock' | full bloom | 204 | |
Slender deutzia | Deutzia gracilus Nikko | first bloom | 211 | |
Roseslug sawfly | Endelomyia aethiops | egg hatch/early instar | 230 | ![]() |
Serviceberry 'Autumn Brilliance' | Amelanchier x grandiflora | full bloom | 235 | |
Boxwood leafminer | Monarthropalpusi flavus | adult emergence | 249 | ![]() ![]() ![]() |
Crabapple 'Adirondack' | Malus 'Adirondack' | first bloom | 260 | |
Dwarf azalea | Rhododendron atlanticum | first bloom | 260 | |
Mayapple | Podophyllum peltatum | first bloom | 264 | |
Spruce spider mite | Oligonychus ununguis | adult/nymph | 276 | ![]() ![]() ![]() |
Dogwood 'Appalachian Spring' | Cornus florida 'Appalachian Spring' | first bloom | 281 | |
Andromeda lace bug | Stephanitis takeyai | egg hatch | 281 | |
Azalea lace bug | Stephanitis pyrioides | egg hatch (1st gen) | 281 | |
Pine needle scale | Chionaspis pinifoliae | egg hatch/crawler (1st gen) | 307 | |
Sheep laurel | Kalmia angustifolia 'Royal Dwarf' | first bloom | 314 | |
Red buckeye | Aesculus pavia | full bloom | 324 | |
Spirea aphid | Aphis spiraecola | adult/nymph | 326 | ![]() ![]() |
Hemlock woolly adelgid | Adelges tsugae | egg hatch (1st gen) | 300 | |
Lilac borer | Podosesia syringae | adult emergence | 350 | ![]() ![]() |
Black locust | Robinia pseudoacacia | first bloom | 357 | ![]() |
Dogwood 'Appalachian Spring' | Cornus florida 'Appalachian Spring' | full bloom | 358 | |
Hawthorn 'Winter King' | Crataegus viridis 'Winter King' | first bloom | 358 | |
Pinxterbloom azalea | Rhododendron periclymenoides | full bloom | 360 | |
Crabapple 'Adirondack' | Malus 'Adirondack' | full bloom | 379 | |
Black locust | Robinia pseudoacacia | full bloom | 386 | ![]() |
Red horsechestnut | Aesculus x carnea 'Ft. McNair' | first bloom | 389 | |
Basswood lace bug | Gargaphia tiliae | adult/nymph | 415 | ![]() |
Emerald ash borer | Agrilus planipennis | adult emergence | 421 | ![]() ![]() ![]() |
Blue false indigo | Baptisia australis 'Purple Smoke' | first bloom | 431 | |
Fourlined plant bug | Poecilocapsus lineatus | egg hatch/early instar | 435 | ![]() ![]() |
Lesser peachtree borer | Synanthedon pictipes | adult emergence (1st gen) | 468 | ![]() |
Maskell scale | Lepidosaphes pallida | egg hatch/crawler (1st gen) | 470 | |
Thornless honeylocust 'Skyline' | Gleditsia triacanthos f. inermis 'Skycole' SKYLINE | first bloom | 472 | |
Japanese snowbell | Styrax japonicus | first bloom | 477 | |
Thornless honeylocust 'Skyline' | Gleditsia triacanthos f. inermis 'Skycole' SKYLINE | full bloom | 478 | |
Oystershell scale | Lepidosaphes ulmi | egg hatch/crawler (1st gen) | 486 | |
Tuliptree | Liriodendron tulipifera | first bloom | 490 | |
Virginia spiderwort | Tradescantia virginiana | first bloom | 494 | |
Gypsy moth | Lymantria dispar | egg hatch | 507 | ![]() ![]() ![]() |
Tuliptree | Liriodendron tulipifera | full bloom | 509 | |
Red horsechestnut | Aesculus x carnea 'Ft. McNair' | full bloom | 511 | |
White prunicola scale | Psedaulacaspis prunicola | egg hatch/crawler (1st gen) | 513 | |
Hawthorn 'Winter King' | Crataegus viridis 'Winter King' | full bloom | 515 | |
Cottony camellia/Taxus scale | Pulvinaria floccifera | egg hatch | 520 | ![]() |
Euonymus scale | Unaspis euonymi | egg hatch/crawler (1st gen) | 522 | |
American smoketree | Cotinus obovatus | full bloom | 575 | |
Common ninebark | Physocarpus opulifolius ‘Luteus’ | full bloom | 583 | |
Yellow flag iris (Maryland Tier 1 invasive plant) | Iris pseudacorus | first bloom | 587 | ![]() ![]() |
Clematis 'Westerplatte' | Clematis ‘Westerplatte’ | full bloom | 589 | |
American yellowwood | Cladrastis kentukea | first bloom | 600 | |
Bagworm | Thyridopteryx ephemeraeformis | egg hatch | 602 | |
American yellowwood | Cladrastis kentukea | full bloom | 627 | |
Japanese snowbell | Styrax japonicus | full bloom | 677 | |
Virginia spiderwort | Tradescantia virginiana | full bloom | 692 | |
Juniper scale | Carulaspis juniperi | egg hatch | 694 | |
Calico scale | Eulecanium cerasorum | egg hatch/crawler | 714 | ![]() |
Oak leacanium scale | Parthenolecanium quercifex | egg hatch/crawler | 789 | |
Japanese maple scale | Lopholeucaspis japonica | egg hatch/crawler (1st gen) | 829 | ![]() ![]() ![]() |
European elm scale | Gossyparia surplus | egg hatch/crawler | 831 | |
Smoketree | Cotinus coggygria | full bloom | 866 | |
European fruit lecanium scale | Parthenolecanium corni | egg hatch/crawler | 904 | |
Japanese stewartia | Stewartia pseudocamelia | first bloom | 908 | ![]() |
Cottony maple scale | Pulvinaria innumerabilis | egg hatch/crawler | 932 | ![]() |
Smooth witherod/Possumhaw viburnum | Viburnum nudum ‘Winterthur’ | full bloom | 1002 | |
Mimosa Webworm | Homadaula anisocentra | egg hatch/crawler (1st gen) | 1002 | ![]() ![]() ![]() |
Japanese stewartia | Stewartia pseudocamelia | full bloom | 1027 | |
Japanese beetle | Popillia japonica | adult emergence | 1056 | ![]() ![]() |
Cryptomeria scale | Aspidiotus cryptomeriae | egg hatch/crawler (1st gen) | 1101 | ![]() ![]() |
Fletcher scale | Parthenolecanium fletcheri | egg hatch/crawler | 1105 | ![]() ![]() |
Bottlebrush buckeye | Aesculus parviflora | first bloom | 1137 | |
Indian wax scale | Ceraplastes ceriferus | egg hatch/crawler | 1145 | ![]() ![]() |
Oriental beetle | Anomala orientalis | adult emergence | 1147 | |
Bottlebrush buckeye | Aesculus parviflora | full bloom | 1200 | |
Mimosa | Albizia julibrissin | first bloom | 1215 | |
Butterfly weed | Asclepias tuberosa | first bloom | 1216 | |
Fall webworm | Hyphantria cunea | egg hatch (1st gen) | 1319 | |
Mimosa | Albizia julibrissin | full bloom | 1330 | |
Beebalm | Monarda spp | first bloom | 1380 | |
Goldenraintree | Koelreuteria paniculata | first bloom | 1393 | |
Satin blue Rose-of-Sharon | Hibiscus syriacus 'Satin Blue' | first bloom | 1492 | |
Swamp milkweed | Asclepias incarnata | first bloom | 1510 | |
Pine needle scale | Chionaspis pinifoliae | egg hatch/crawler (2nd gen) | 1537 | ![]() ![]() |
Green June beetle | Cotinus nitida | adult emergence | 1539 | ![]() ![]() ![]() |
Goldenraintree | Koelreuteria paniculata | full bloom | 1597 | |
White prunicola scale | Psedaulacaspis prunicola | egg hatch/crawler (2nd gen) | 1637 | |
Satin blue Rose-of-Sharon | Hibiscus syriacus 'Satin Blue' | full bloom | 1742 | |
Obscure scale | Melanaspis obscura | egg hatch/crawler | 1774 | ![]() |
Orangestriped oakworm | Anisota senatoria | egg hatch (early instar) | 1917 | ![]() ![]() ![]() |
Maskell scale | Lepidosaphes pallida | egg hatch/crawler (2nd gen) | 2035 | |
Regent pagodatree | Styphnolobrium japonicum | first bloom | 2111 | |
Euonymus scale | Unaspis euonymi | egg hatch/crawler (2nd gen) | 2235 | ![]() ![]() |
Crapemyrtle 'Natchez' | Lagerstroemia x 'Natchez' | first bloom | 2251 | |
Regent pagodatree | Styphnolobrium japonicum | full bloom | 2330 | |
Crimsoneyed rosemallow | Hibiscus moscheutos | first bloom | 2464 | |
Hollow joe pye weed | Eutrochium fistulosum | first bloom | 2494 | |
Japanese maple scale | Lopholeucaspis japonica | egg hatch/crawler (2nd gen) | 2508 | ![]() ![]() ![]() |
Natchez crape myrtle | Lagerstroemia x 'Natchez' | full bloom | 2617 | |
Crimsoneyed rosemallow | Hibiscus moscheutos | full bloom | 2704 | |
Seven-son flower | Heptacodium miconioides | first bloom | 2770 | |
Fall webworm | Hyphantria cunea | egg hatch/crawler (2nd gen) | 2793 | |
Seven-son flower | Heptacodium miconioides | full bloom | 3072 | |
White prunicola scale | Psedaulacaspis prunicola | egg hatch/crawler (3rd gen) | 3270 | |
Banded ash clearwing borer | Podosesia aureocincta | adult emergence | 3357 | ![]() |
Tuliptree scale | Toumeyella liriodendri | egg hatch/crawler | 3519 | ![]() ![]() |