RESEARCH &
EDUCATION
CENTERS (REC)
Pest Predictive Calendar-Landscape/Nursery
The Pest Predictive Calendar is a monitoring tool to assist in predicting when susceptible life stage(s) (stage you want to target for control measures) of pest insects are active by using plant phenological indicators (PPI) and growing degree days (GDD). This tool will lead to improved timing of management tactics and more effective pest management.
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Phenological sequence of plant flowering and insect events with their associated GDD in Maryland. For more information go to: How to Use the Pest Predictive Calendar and Getting and Using Growing Degree Days.
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 (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 (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 (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 | |
| 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 (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 | |
| White prunicola scale | Psedaulacaspis prunicola | egg hatch (1st gen) | 594 | |
| 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 | 714 | |
| Oak leacanium scale | Parthenolecanium quercifex | egg hatch | 789 | |
| Japanese maple scale | Lopholeucaspis japonica | egg hatch (1st gen) | 829 |  |
| European elm scale | Gossyparia surplus | egg hatch | 831 | |
| Smoketree | Cotinus coggygria | full bloom | 866 | |
| European fruit lecanium scale | Parthenolecanium corni | egg hatch | 904 | |
| Japanese stewartia | Stewartia pseudocamelia | first bloom | 908 |  |
| Smooth witherod/Possumhaw viburnum | Viburnum nudum ‘Winterthur’ | full bloom | 1002 | |
| Mimosa Webworm | Homadaula anisocentra | egg hatch (1st gen) | 1002 |  |
| Japanese stewartia | Stewartia pseudocamelia | full bloom | 1027 | |
| Japanese beetle | Popillia japonica | adult emergence | 1056 | |
| Fletcher scale | Parthenolecanium fletcheri | egg hatch | 1105 | |
| Bottlebrush buckeye | Aesculus parviflora | first bloom | 1137 | |
| Indian wax scale | Ceraplastes ceriferus | egg hatch | 1145 |  |
| Cryptomeria scale | Aspidiotus cryptomeriae | egg hatch (1st gen) | 1190 | |
| Cottony maple scale | Pulvinaria innumerabilis | egg hatch | 1194 | |
| Bottlebrush buckeye | Aesculus parviflora | full bloom | 1200 | |
| Mimosa | Albizia julibrissin | first bloom | 1215 | |
| Butterfly weed | Asclepias tuberosa | first bloom | 1216 | |
| 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 | |
| Fall webworm | Hyphantria cunea | egg hatch (1st gen) | 1530 | |
| Pine needle scale | Chionaspis pinifoliae | egg hatch (2nd gen) | 1537 |  |
| Green June beetle | Cotinus nitida | adult emergence | 1539 |  |
| Goldenraintree | Koelreuteria paniculata | full bloom | 1597 | |
| White prunicola scale | Psedaulacaspis prunicola | egg hatch (2nd gen) | 1637 | |
| Satin blue Rose-of-Sharon | Hibiscus syriacus 'Satin Blue' | full bloom | 1742 | |
| Obscure scale | Melanaspis obscura | egg hatch | 1774 | |
| Orangestriped oakworm | Anisota senatoria | egg hatch (early instar) | 1917 |  |
| Maskell scale | Lepidosaphes pallida | egg hatch (2nd gen) | 2035 | |
| Regent pagodatree | Styphnolobrium japonicum | first bloom | 2111 | |
| Euonymus scale | Unaspis euonymi | egg hatch (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 (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 (2nd gen) | 2793 | |
| Seven-son flower | Heptacodium miconioides | full bloom | 3072 | |
| White prunicola scale | Psedaulacaspis prunicola | egg hatch (3rd gen) | 3270 | |
| Banded ash clearwing borer | Podosesia aureocincta | adult emergence | 3357 | |
| Tuliptree scale | Toumeyella liriodendri | egg hatch | 3519 |  |
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