University of Maryland Extension

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
Red maple Acer rubrum full bloom 42
Euonymus Leaf-notcher Pryeria sinica egg hatch 43
Callery pear 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
Double weeping higan cherry Prunus shubhirtella 'Pendula Plena Rosa'
first bloom 100
Flowering quince Chaenomeles speciosa first bloom 103
Bridal wreath spirea Spirea x vanhouttei first bloom 104
Common blue violet Viola sororia first bloom 104
Callery pear Pyrus calleryana full bloom 105
Sassafras Sassafras albidum full bloom 117
Bridal wreath spirea Spirea x vanhouttei full bloom 123
Eastern redbud Cercis canadensis first bloom 137
Double weeping higan cherry Prunus subhirtella 'Pendula Plena Rosa' full bloom 150
Eastern redbud Cercis candensis full bloom 156
Fernald’s shadbush Amelanchier fernaldii full bloom 163
Nantucket serviceberry Amelanchier nantucketensis full bloom 171
Spiny witchhazel gall aphid Hamamelistes spinosus adult/nymph 171
Inkberry holly leafminer Phytomyza glabricola adult emergence 179
Mountain pieris Pieris floribunda full bloom 197
White enkianthus Enkianthus perulatus 'JL Pennock' full bloom 204
Boxwood leafminer Monarthropalpusi flavus adult emergence 249
Dwarf azalea Rhododendron atlanticum first bloom 260
Mayapple Podophyllum peltatum first bloom 264
Spruce spider mite Oligonychus ununguis adult/nymph 276
Pine needle scale Chionaspis pinifoliae egg hatch (1st gen) 283
Sheep laurel Kalmia angustifolia 'Royal Dwarf' first bloom 314
Spirea aphid Aphis spiraecola adult/nymph 326
Lilac borer Podosesia syringae adult emergence 350
Black locust Robinia pseudoacacia first bloom 357
Pinxterbloom azalea Rhododendron periclymenoides full bloom 360
Emerald ash borer Agrilus planipennis adult emergence 402  
Blue false indigo Baptisia australis 'Purple Smoke' first bloom 431
Maskell scale Lepidosaphes pallida egg hatch (1st gen) 437
Virginia spiderwort Tradescantia virginiana first bloom 442
Black locust Robinia pseudoacacia full bloom 447
Basswood lace bug Gargaphia tiliae adult/nymph 462
Lesser peachtree borer Synanthedon pictipes adult emergence (1st gen) 468
Gypsy moth Lymantria dispar egg hatch
492  
Blue false indigo Baptisia australis 'Purple Smoke' full bloom 518
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
Bagworm Thyridopteryx ephemeraeformis egg hatch 591
White prunicola scale Psedaulacaspis prunicola egg hatch (1st gen) 594
Potato leafhopper Empoasca fabae adult arrival 659
Juniper scale Carulaspis juniperi egg hatch 694
Yellow flag iris (Maryland Tier 1 invasive plant) Iris pseudacorus full bloom 721  
Oak leacnium scale Parthenolecanium quercifex egg hatch 755
Virginia spiderwort Tradescantia virginiana full bloom 760
Japanese maple scale Lopholeucaspis japonica egg hatch (1st gen) 829  
Cottony camellia/taxus scale Pulvinaria floccifera egg hatch 856
Calico scale Eulecanium cerasorum egg hatch 858
Smoketree Cotinus coggygria full bloom 866
Goat's beard Aruncus dioecus full bloom 872
Japanese stewartia Stewartia pseudocamelia first bloom 908
Indian pink Spigelia marilandica full bloom 967
Euonymus scale Unaspis euonymi egg hatch (1st gen) 968
Carolina lupine Thermopsis caroliniana full bloom 989
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
Tennessee purple coneflower Echinacea tennesseensis full bloom 1345
Beebalm Monarda spp first bloom 1380
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
Butterfly weed Asclepias tuberosa full bloom 1556
White prunicola scale Psedaulacaspis prunicola egg hatch (2nd gen) 1637
Beebalm Monarda spp. full bloom 1666
Swamp milkweed Aslepias incarnata full bloom 1729
Euonymus scale Unaspis euonymi egg hatch (2nd gen) 1770  
Orangestriped oakworm Anisota senatoria egg hatch (early instar) 1915
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
Crimsoneyed rosemallow Hibiscus moscheutos full bloom 2704
Hollow joe pye weed Eutrochium fistulosom full bloom 2714
Fall webworm Hyphantria cunea egg hatch (2nd gen) 2793
White prunicola scale Psedaulacaspis prunicola egg hatch (3rd gen) 3270
Tuliptree scale Toumeyella liriodendri egg hatch 3551
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