Please print or download these resources (click on them):
General Nursery Scouting (contains conifer information within range)
- Printable Nursery Pest Scouting 250-600 GDD
- Expanded Nursery Pest Scouting Guide 250-600 with CLICKABLE LINKS
- (Zoom in and click directly on the links within this document)
Conifer / Christmas Tree Specific Pest Scouting Guides
- Conifer/Christmas Tree Specific Pest Scouting Guide 0-600 GDD – PRINTABLE
- Conifer/Christmas Tree Specific Pest Scouting Guide 0-600 GDD – CLICKABLE LINKS
- (Zoom in and click directly on the links within this document)
To determine your local growing degree-days, please review this post “Obtaining your local growing degree-day information”
Projected GDD50 accumulation as of 5/5/2021 | ||||||
Region | Location | 5-May | 1-Jun | 1-Jul | 1-Aug | 1-Sep |
Southern | Upper Deerfield (NJ50) | 308 | 665 | 1342 | 2184 | 2970 |
Central | Howell / Freehold (NJ10) | 208 | 511 | 1132 | 1926 | 2660 |
Northern | High Point (NJ59) | 127 | 315 | 767 | 1373 | 1928 |
Forecast: NOAA NCEP Coupled Forecast System model version 2 (CFSv2) forecast system (3.5 months) (USPEST.ORG) |
Pest Scouting – Growing Degree-day Ranges | (240-600 GDD50) | |||||
CROP TYPE | Common Name | Scientific Name | GDD Min (50F) | GDD Max (95F) | Reference | Developmental / Target Stage |
Many | Redheaded flea beetle | Systena frontalis | 242 | 600 | Unv. Del | First control target – egg hatch / larval activity |
Conifer | Arborvitae leafminer | Argyresthia thuiella | 245 | 360 | RU | Larvae Treatments (1st generation) |
Prunus | American plum borer | Euzophera semifuneralis | 245 | 440 | 5 | Adult flight, egg laying |
Boxwood | Boxwood mites | Eurytetranychus buxi | 245 | 600 | RU | All Stages |
Lilac | Lilac leafminer | Caloptilia syringella | 246 | 363 | 5 | Larvae Treatments |
Holly | Holly leafminer | Phytomyza ilicis | 246 | 448 | RU | Larvae Treatment |
Yew | Taxus mealybug | Dysmicoccus wistariae | 246 | 618 | RU | Adults/Crawlers |
Conifer | Pine sawflies (Red-headed) | Neodiprion lecontei | 246 | 1388 | RU | Larvae (1st generation) |
Boxwood | Boxwood leafminer | Monarthropalpusi flavus | 249 | – | 6 | Adult emergence |
Conifer | Eastern spruce gall adelgid | Adelges abietis | 250 | 310 | 5 | Egg hatch, galls begin forming (not a control target) |
Birch | Birch Leafminer | Fenusa pusilla | 275 | 375 | 4 | Adults laying eggs |
Boxwood | Boxwood Psyllid | Cacopsylla busi | 290 | 440 | RU | Nymphs |
Conifer | Pine Needle Scale | Chionaspis pinifoliae | 298 | 448 | RU | Crawlers (1st generation) – control target |
Locust | Locust leafminer | Odontota dorsalis | 298 | 533 | 5 | Typical treatment window |
Conifer | Pine eriophyid mites | Eriophyidae | 298 | 533 | 5 | Typical treatment window |
Malus | Redbanded leafroller | Argyrotaenia velutinana | 298 | 618 | 5 | Typical treatment window |
Privet | Privet Rust Mites | Aculus ligustri | 298 | 802 | RU | All stages |
Oaks | Kermes oak scale | Allokermes spp. | 298 | 912 | 5 | Typical treatment window |
Conifer | Pine root collar weevil | Hylobius radicis | 300 | 350 | 4 | 1st adults active |
Conifer | Turpentine beetle | Dendroctonus terebrans | 300 | 350 | 4 | Parent beetles colonizing brood material |
Spirea | Spirea aphid | Aphis spiraecola | 326 | – | 6 | Adults/nymphs |
Conifer | Hemlock Woolly Adelgid | Adelges tsugae | 350 | 350 | RU | Eggs and 50% hatch |
Malus, Prunus, many | Lesser peach tree borer | Synanthedon pictipes | 350 | 375 | 4 | Adult flight, egg laying |
Rhododendron | Azalea Lacebug | Stephanitis pyrioides | 350 | 646 | RU | Adults (1st generation) |
Dogwood, apple, pecan, elm, hickory, willow | Dogwood borer | Synanthedon scitula | 350 | 850 | 4 | adults, eggs, caterpillars |
Conifer | Elongate Hemlock Scale | Fiorinia externa | 360 | 700 | RU | Crawlers (1st generation) |
Elm | Elm Leaf Beetle | Xanthogaleruca luteola | 363 | 530 | RU | Larvae treatment (1st generation) |
Conifer | Larch casebearer | Coleophora laricella | 363 | 618 | 2,4 | Nymphs active – typical treatment window |
Many | Oystershell Scale | Lepidosaphes ulmi | 363 | 707 | RU | Crawlers |
Walnut | Walnut blister mite | Eriophyes erinea | 363 | 707 | 5 | Typical treatment window |
Beech | Woolly beech aphids | Grylloprociphilus imbricator & Phyllaphis fagi | 363 | 7070 | 5 | Typical treatment window |
Conifer | Striped pine scale | Toumeyella sp. | 400 | 500 | 3 | Crawlers (1st generation) |
Conifer | Pine needle midge | Thecodiplosis brachynteroides | 400 | 500 | 7 | Adults (1st generation) |
Conifer | Pine tortoise scale | Toumeyella parvicornis | 400 | 1000 | 4 | Crawlers |
Yews, Rhododendrons, many | Black Vine Weevil | Otiorhynchus sulcatus | 400 | 2800 | RU | Adults treatment |
Basswood | Basswood lacebug | Gargaphia tiliae | 415 | – | 6 | Adults/nymphs |
MANY | Fourlined plant bug | Poecilocapsus lineatus | 435 | – | 6 | Egg hatch / early instars |
Many | Two-Spotted Mite | Tetranychus urticae | 437 | 997 | RU | Adults (build-up activity) |
Birch | Bronze Birch Borer | Agrilus anxius | 440 | 880 | RU | Adults (egg laying) |
Boxwood | Boxwood Leafminer | Monarthropalpusi flavus | 448 | 700 | RU | Larvae treatment |
Rhododendron | Azalea whitefly | Pealius azaleae | 448 | 700 | 5 | Adults/nymphs |
Oak | Oak skeletonizer | Bucculatrix ainsliella | 448 | 707 | 5 | Typical treatment window |
Conifer | Hemlock looper | Lambdina fiscellaria | 448 | 707 | 5 | Typical treatment window |
Conifer | Pine shoot beetle | Tomicus piniperda | 450 | 500 | 4 | Adults emerge; begin shoot feeding – control target |
Conifer | Pine Chafer (Anomela Beetle) | Anomala oblivia | 450 | 600 | 7 | Adults (1st generation) |
Many | Gypsy moth | Lymanttria dispar | 450 | 900 | 4 | Caterpillar to pupation – control target missed |
Juniper | Maskell scale | Lepidosaphes pallida | 470 | – | 6 | Crawlers (1st generation) |
Conifer | European pine shoot moth | Rhyacionia buoliana | 480 | 710 | 5 | Larvae Treatment |
Malus, Prunus, many | Peach Tree Borer | Synanthedon sp. | 500 | 600 | RU | Adults – emerge (1st treatment both types) |
Rhododendron | Rhododendron Borer | Synanthedon rhododendri | 509 | 696 | RU | Adults emerge |
Many | White prunicola scale | Psedaulacaspis prunicola | 513 | – | 6 | Crawlers (1st generation) |
Many | Redheaded flea beetle | Systena frontalis | 517 | 1028 | Unv. Del | Adults – feeding / laying eggs |
Many | Cottony camellia / taxus scale | Pulvinaria floccifera | 520 | – | 6 | Crawlers (1st generation) |
Birch | Birch Leafminer | Fenusa pusilla | 530 | 700 | RU | Larvae (2nd generation) |
Conifer | Arborvitae Leafminer | Argyresthia thuiella | 533 | 700 | RU | Adults (egg laying) – larvae treatments |
Euonymus | Euonymus Scale | Unaspis euonymil | 533 | 820 | RU | Crawlers (1st generation) |
Oak | Oak blotch leafminers | Cameraria spp. ; Tisheria spp. | 533 | 912 | 5 | Typical treatment window |
Maple | Greenstriped mapleworm | Dryocampa rubicunda | 533 | 1645 | 5 | Control target |
Conifer | Balsam gall midge | Paradiplosis tumifex | 550 | 700 | 4 | Galls apparent |
Conifer | Juniper scale | Carulaspis juniperi | 550 | 700 | 7 | Egg hatch |
Malus, Prunus, many | Greater peach tree borer | Synanthedon exitiosa | 575 | 710 | 4 | Adult emergence |
Conifer | Cryptomeria scale | Aspidiotus cryptomeriae | 600 | 800 | 3 | First crawler emergence |
Conifer | Bagworm | Thyridopteryx ephemeraeformis | 600 | 900 | RU | Larvae (early instars) – ONLY CONTROL WINDOW |
Conifer | Cooley spruce gall adelgid | Adelges cooleyi | 600 | 1000 | 7 | Nymphs active – Douglas fir (control target) |
RU | Rutgers Cooperative Extension – Landscape IPM Notes | |||||
2 | http://ccetompkins.org/resources/using-growing-degree-days-for-insect-management | |||||
3 | https://extension.psu.edu/ipm-basics-for-christmas-trees#section-2 | |||||
4 | https://www.canr.msu.edu/ipm/agriculture/christmas_trees/gdd_of_conifer_insects | |||||
5 | https://www.agriculture.nh.gov/publications-forms/documents/landscape-pests.pdf | |||||
6 | https://extension.umd.edu/ipm/pest-predictive-calendar-landscapenursery | |||||
7 | https://www.canr.msu.edu/ipm/agriculture/christmas_trees/gdd_of_landscape_insects | |||||
Unv. Del. | Coorespondance with Dr. Kunkel (University of Delaware) |
Boxwood Blight risk-model information, considerations, and links:
Boxwood Blight Risk Assessment as of 5/5/2021 | ||||||||
Region | Location | CODE | 4-May | 5-May | 6-May | 7-May | 8-May | 9-May |
Southern | Upper Deerfield | NJ50 | Infection Risk | Infection Risk | Very Low | Very Low | Very Low | Very Low |
Central | Howell / Freehold | NJ10 | Low | Low | Very Low | Very Low | Very Low | Very Low |
Northern | High Point | NJ59 | Very Low | Very Low | Very Low | Very Low | Very Low | Very Low |
Please check your local boxwood blight risk here (click here and type in your area code – select closest station) |
Wednesday 5/4/21 -PPA Post regarding boxwood blight activity (click here)
- These advisories are general in nature and change rapidly so someone from your business should be using this risk model (CLICK HERE) daily if boxwood is important to your financial stability – In 30 seconds you can have a better idea of boxwood blight (and other pathogen) activity in your immediate area!
- (click on the link – input area code – select closest weather station – check 7-14 prediction – click on graph / table)
Phytophthora sampling and Redheaded Flea Beetle survey requests (5-minutes to take both)
Contact – Timothy J. Waller – twaller@njaes.rutgers.edu for more information