COLLEGE OF FOOD, AGRICULTURAL,
AND ENVIRONMENTAL SCIENCES

The Ohio State Phenology Calendar

Species   
Phenological Event
GDD
Silver Maple - Acer saccharinum first bloom 34 Corneliancherry Dogwood - Cornus mas first bloom 40 Silver Maple - Acer saccharinum full bloom 42 Red Maple - Acer rubrum first bloom 44 Speckled Alder - Alnus incana ssp. rugosa first bloom 52 Northern Lights Forsythia - Forsythia x intermedia first bloom 58 Japanese Pieris - Pieris japonica first bloom 60 Red Maple - Acer rubrum full bloom 75 Star Magnolia - Magnolia stella first bloom 83 White Pine Weevil - Pissodes strobi adult emergence 84 Border Forsythia - Forsythia x intermedia first bloom 86 Eastern Tent Caterpillar - Malacosoma americanum egg hatch 92 Manchu Cherry - Prunus tomentosa first bloom 93 Northern Lights Forsythia - Forsythia x intermedia full bloom 94 Speckled Alder - Alnus incana full bloom 97 Corneliancherry Dogwood - Cornus mas full bloom 98 Norway Maple - Acer platanoides first bloom 116 Border Forsythia - Forsythia x intermedia full bloom 116 Chanticleer Callery Pear - Pyrus calleryana first bloom 123 Sargent Cherry - Prunus sargentii first bloom 127 Larch Casebearer - Coleophora laricella larval feeding begins 128 Japanese Pieris - Pieris japonica full bloom 129 Saucer Magnolia - Magnolia x soulangiana first bloom 133 Exotic Ambrosia Beetle - Xylosandrus germanus first adult emergence 136 Common Floweringquince - Chaenomeles speciosa first bloom 137 Bradford Callery Pear - Pyrus calleryana first bloom 142 European Pine Sawfly - Neodiprion sertifer egg hatch 144 Weeping Higan Cherry - Prunus subhirtella first bloom 145 PJM Rhododendron - Rhododendron PJM first bloom 147 Norway Maple - Acer platanoides full bloom 149 Chanticleer Callery Pear - Pyrus calleryana full bloom 149 Inkberry Leafminer - Liriomyza sativae adult emergence 150 Star Magnolia - Magnolia stella full bloom 151 Sargent Cherry - Prunus sargentii full bloom 151 Allegheny Serviceberry - Amelanchier laevis first bloom 153 Spring Snow Crabapple - Malus x spring snow first bloom 155 Manchu Cherry - Prunus tomentosa full bloom 155 Smooth Crabgrass - first seedling emergence 155 Apple Serviceberry - Amelanchier x grandiflora first bloom 159 Spruce Spider Mite - Oligonychus ununguis egg hatch 162 Bradford Callery Pear - Pyrus calleryana full bloom 164 Allegheny Serviceberry - Amelanchier laevis full bloom 169 Saucer Magnolia - Magnolia x soulangiana full bloom 174 PJM Rhododendron - Rhododendron PJM full bloom 178 Weeping Higan Cherry - Prunus subhirtella full bloom 179 Boxwood Psyllid - Psylla negudinis egg hatch 179 Apple Serviceberry - Amelanchier x grandiflora full bloom 182 Common Chokecherry - Prunus virginiana first bloom 182 Koreanspice Viburnum - Viburnum carlesii first bloom 185 Regent Serviceberry - Amelanchier alnifolia first bloom 186 Japanese Flowering Crab - Malus floribunda first bloom 189 White/Green Ash - Fraxinus americana first bloom 190 Eastern Redbud - Cercis canadensis first bloom 191 Gypsy Moth - Lymantria dispar egg hatch 192 Donald Wyman Crabapple - Malus angustifolia first bloom 197 Snowdrift Crabapple - Malus x snowdrift first bloom 198 Compact Garland Spirea - Spirea x arguta full bloom 205 Koreanspice Viburnum - Viburnum carlesii full bloom 205 Azalea Lace Bug - Stephanitis pyrioides egg hatch 206 Spring Snow Crabapple - Malus x spring snow full bloom 209 Viburnum Leaf Beetle - Pyrrhalta viburni first egg hatch 210 Large Crabgrass - first seedling emergence 211 Carolina Silverbell - Halesia tetraptera first bloom 213 Common Floweringquince - Chaenomeles speciosa full bloom 214 Birch Leafminer - Fenusa pusilla adult emergence 215 Coral Burst Crabapple - Malus coralcole first bloom 217 Regent Serviceberry - Amelanchier alnifolia full bloom 219 Elm Leafminer - Kaliofenusa ulmi adult emergence 219 Common Chokecherry - Prunus virginiana full bloom 221 Alder Leafminer - Kaliodenusa ulmi adult emergence 224 Honeylocust Spider Mite - Platytetranychus multidigituli egg hatch 227 Wayfaringtree Viburnum - Viburnum lantana first bloom 229 Honeylocust Plant Bug - Diaphoncoris chlorionis egg hatch 230 Sargent Crabapple - Malus sargentii first bloom 230 Tatarian Honeysuckle - Lonicera tatarica first bloom 233 Common Lilac - Syringa vulgaris first bloom 234 Persian Lilac - Syringa persica first bloom 240 White/Green Ash - Fraxinus americana full bloom 240 Ohio Buckeye - Aesculus glabra first bloom 245 Eastern Redbud - Cercis canadensis full bloom 245 Snowdrift Crabapple - Malus x snowdrift full bloom 250 Donald Wyman Crabapple - Malus angustifolia full bloom 251 Common Horsechestnut - Aesculus hippocastanum first bloom 251 Hawthorn Lace Bug - Corythucha cydoniae adult emergence 253 Japanese Flowering Crab - Malus floribunda full bloom 254 Hawthorn Leafminer - Kaliofenusa ulmi adult emergence 260 Flowering Dogwood - Cornus florida first bloom 263 Coral Burst Crabapple - Malus coralcole full bloom 263 Smooth Crabgrass - 25% seedling emergence 263 Dwarf Fothergilla - Fothergilla gardenii first bloom 265 Red Buckeye - Aesculus pavia first bloom 265 Carolina Silverbell - Halesia tetraptera full bloom 266 Japanese Kerria - Kerria japonica first bloom 268 Blackhaw Viburnum - Viburnum prunifolium first bloom 269 Imported Willow Leaf Beetle - Chrysomela versicolor adult emergence 274 Red Chokeberry - Aronia arbutifolia first bloom 281 Wayfaringtree Viburnum - Viburnum lantana full bloom 290 Sargent Crabapple - Malus sargentii full bloom 298 Persian Lilac - Syringa x persica full bloom 303 Red Horsechestnut - Aesculus x carnea first bloom 304 Umbrella Magnolia - Magnolia tripetala first bloom 304 Pine Needle Scale - Chionaspis pinifoliae egg hatch - 1st generation 305 Cooley Spruce Gall Adelgid - Adelges cooleyi egg hatch 308 Eastern Spruce Gall Adelgid - Adelges abietis egg hatch 308 Vanhoutte Spirea - Spiraea x vanhouttei first bloom 309 Common Lilac - Syringa vulgaris full bloom 315 Pink Princess Weigela - Weigela florida first bloom 316 Blackhaw Viburnum - Viburnum prunifolium full bloom 322 Redosier Dogwood - Cornus stolonifera first bloom 323 Dwarf Fothergilla - Fothergilla gardenii full bloom 325 Winter King Hawthorn - Crategus virdis first bloom 328 Lilac Borer - Podosesia syringae adult emergence 330 Slender Deutzia - Deutzia gracilis first bloom 338 Japanese Kerria - Kerria japonica full bloom 342 Common Horsechestnut - Aesculus hippocastanum full bloom 344 Red Chokeberry - Aronia arbutifolia full bloom 351 Doublefile Viburnum - Viburnum plicatum first bloom 353 Smooth Crabgrass - 50% seedling emergence 354 Pagoda Dogwood - Cornus alternifolia first bloom 363 Red Java Weigela - Weigela florida first bloom 365 Black Cherry - Prunus serotina first bloom 368 Optimal time to spray for gypsy moth - 370 Common Sweetshrub - Calycanthus floridus first bloom 371 Lesser Peach Tree Borer - Synanthedon pictipes adult emergence 372 Ohio Buckeye - Aesculus glabra full bloom 374 Holly Leafminer - Phytomyza ilicis adult emergence 375 Euonymus Scale - Unaspis euonymii egg hatch - 1st generation 406 Ohio Pioneer Thicket Hawthorn - Crataegus laevigata first bloom 406 Vanhoutte Spirea - Spiraea x vanhouttei full bloom 406 Winter King Hawthorn - Crategus virdis full bloom 407 Catawba Rhododendron - Rhododendron catawbiense first bloom 407 Tatarian Honeysuckle - Lonicera tatarica full bloom 410 Beautybush - Kolkwitzia amabalis first bloom 417 Black Cherry - Prunus serotina full bloom 419 Miss Kim Manchurian Lilac - Syringa pubescens first bloom 422 White Fringetree - Chionanthus virginica first bloom 435 Locust Leafminer - Odontota dorsalis adult emergence 437 Red Horsechestnut - Aesculus x carnea full bloom 440 Boxwood Leafminer - Buxus sempervirens adult emergence 440 Doublefile Viburnum - Viburnum plicatum full bloom 444 Bush Cinquefoil - Dasiphora fruticosa first bloom 444 Snowmound Nippon Spirea - Spiraea nipponica first bloom 445 Red Prince Weigela - Weigela florida first bloom 446 Pink Princess Weigela - Weigela florida full bloom 446 Redosier Dogwood - Cornus sericea full bloom 448 Scarlet Firethorn - Pyracantha coccinea first bloom 459 Black Locust - Robinia pseudoacacia first bloom 467 Ohio Pioneer Thicket Hawthorn - Crataegus laevigata full bloom 470 Red Buckeye - Aesculus pavia full bloom 471 Large Crabgrass - 25% seedling emergence 472 Common Ninebark - Physocarpus opulifolius first bloom 478 Pagoda Dogwood - Cornus alternifolia full bloom 479 Umbrella Magnolia - Magnolia tripetala full bloom 480 Sweet Mockorange - Philadelphus coronarius first bloom 482 Oystershell Scale - Lepidosaphes ulmi egg hatch 497 Miss Kim Manchurian Lilac - Syringa pubescens full bloom 498 Smoketree - Cotinus coggygria first bloom 501 Catawba Rhododendron - Rhododendron catawbiense full bloom 503 White Fringetree - Chionanthus virginica full bloom 517 Arrowwood Viburnum - Viburnum dentatum first bloom 534 American Yellowwood - Cladrastis kentukea first bloom 546 Bronze Birch Borer - Agrilus anxius adult emergence 547 Multiflora Rose - Rosa multiflora first bloom 548 Smooth Crabgrass - 80% seedling emergence 548 Black Locust - Robinia pseudoacacia full bloom 548 Emerald Ash Borer - Agrilus planipennis adult emergence 550 American Holly - Ilex aquifolium first bloom 556 Black Vine Weevil - Otiorhynchus sulcatus adult emergence 560 Mountain-laurel - Kalmia latifolia first bloom 565 Scarlet Firethorn - Pyracantha coccinea full bloom 565 Red Java Weigela - Weigela florida full bloom 565 Sweetbay Magnolia - Magnolia virginiana first bloom 566 Potato Leafhopper - Empoasca fabae adult arrival 568 Juniper Scale - Carulaspis juniperi egg hatch 571 Snowmound Nippon Spirea - Spiraea nipponica full bloom 583 Beautybush - Kolkwitzia amabalis full bloom 592 Chinese Dogwood - Cornus kousa first bloom 593 Common Ninebark - Physocarpus opulifolius full bloom 596 American Yellowwood - Cladrastis kentukea full bloom 599 Smoketree - Cotinus coggygria full bloom 611 Arrowwood Viburnum - Viburnum dentatum full bloom 621 Japanese Tree Lilac - Syringa reticulata first bloom 622 Bumald Spirea - Spiraea x bumalda first bloom 624 Twospotted Spider Mite - Tetranychus urticae egg hatch 627 Bagworm - Thyridopteryx ephemeraeformis egg hatch 630 Washington Hawthorn - Crataegus phaenopyrum first bloom 635 American Holly - Ilex aquifolium full bloom 642 Multiflora Rose - Rosa multiflora full bloom 643 Northern Catalpa - Catalpa speciosa first bloom 675 Large Crabgrass - 50% seedling emergence 692 American Elder - Sambucus nigra first bloom 707 Sweet Mockorange - Philadelphus coronarius full bloom 717 Red Prince Weigela - Weigela florida full bloom 727 Fuzzy Deutzia - Deutzia scabra first bloom 727 Fletcher Scale - Hemiptera sternorrhyncha egg hatch - 1st generation 730 Washington Hawthorn - Crataegus phaenopyrum full bloom 731 Calico Scale - Hemiptera sternorrhyncha egg hatch 748 European Fruit Lecanium Scale - Parthenolecanium corni egg hatch 767 Greater Peach Tree Borer - Synanthedon exitiosa adult emergence 775 Striped Pine Scale - Toumeyella pini egg hatch 783 Winterberry Holly - Ilex verticillata first bloom 794 Japanese Tree Lilac - Syringa reticulata full bloom 808 Rhododendron Borer - Agrilus planipennis adult emergence 815 Northern Catalpa - Catalpa speciosa full bloom 816 Mountain-laurel - Kalmia latifolia full bloom 822 Dogwood Borer - Synanthedon scitula adult emergence 830 Oakleaf Hydrangea - Hydrangea quercifolia first bloom 835 Cottony Maple Scale - Pulvinaria innumerabilis egg hatch 851 Panicle Hydrangea - Hydrangea paniculata first bloom 856 Fall Webworm - Hyphantria cunea egg hatch 867 Mimosa Webworm - Homadaula anisocentra egg hatch - 1st generation 874 Fuzzy Deutzia - Deutzia scabra full bloom 884 Asian longhorned beetle - Anoplophora glabripennis first adult emergence 887 Winged Euonymus Scale - Unaspis euonymii egg hatch 892 Spruce Budscale - Physokermes piceae egg hatch 894 Winterberry Holly - Ilex verticillata full bloom 897 Greenspire Littleleaf Linden - Tilia cordata first bloom 899 American Elder - Sambucus nigra full bloom 909 Southern Catalpa - Catalpa bignonioides first bloom 913 Bumald Spirea - Spiraea x bumalda full bloom 917 Panicled Goldenraintree - Koelreuteria paniculata first bloom 924 June Bride Littleleaf Linden - Tilia cordata first bloom 953 Azalea Bark Scale - Eriococcus azaleae egg hatch 957 Japanese Beetle - Popillia japonica adult emergence 970 Emerald ash borer - Agrilus planipennis 50% adult emergence 1000 Rosebay Rhododendron - Rhododendron maximum first bloom 1010 Greenspire Littleleaf Linden - Tilia cordata full bloom 1047 Southern Catalpa - Catalpa bignonioides full bloom 1073 June Bride Littleleaf Linden - Tilia cordata full bloom 1115 Bottlebrush Buckeye - Aesculus parviflora first bloom 1158 Large Crabgrass - 80% seedling emergence 1160 Ural Falsespirea - Sorbaria sorbifolia first bloom 1170 Panicled Goldenraintree - Koelreuteria paniculata full bloom 1251 Rose-of-Sharon - Hibiscus syriacus first bloom 1347 Pine Needle Scale - Chionaspis pinifoliae egg hatch - 2nd generation 1349 Asian longhorned beetle - Anoplophora glabripennis 50% adult emergence 1887 Mimosa Webworm - Homadaula anisocentra egg hatch - 2nd generation 1920 Euonymus Scale - Unaspis euonymii egg hatch - 2nd generation 1923 Magnolia Scale - Hemiptera sternorrhyncha egg hatch 1938 Banded Ash Clearwing Borer - Podosesia syringae adult emergence 2195 Wooster 10/19/2020 5:10:21 PM 3,134



    


Denise Ellsworth
1680 Madison Ave. | Wooster, OH 44691
Phone: 330-263-3723 | ellsworth.2@osu.edu


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