NURSERY PEST SCOUTING GUIDE – JULY (1300-2200 GDD50)
Please download and print the pest scouting guide resources (printable version of the information below for your desk or truck) –(click on the link and then print):
- Nursery Pest Scouting Guide (1300-2200) GDD50
- Mid-season Conifer Specific Pest Scouting Guide (600-2200) GDD50
To determine your local growing degree-days, please review this post “Obtaining your local growing degree-day information”
| Projected GDD50 accumulation as of 7/1/2021 | ||||||
| Region | Location | 1-Jul | 1-Aug | 1-Sep | 1-Oct | 1-Nov |
| Southern | Upper Deerfield (NJ50) | 1303 | 2145 | 2931 | 3477 | 3682 |
| Central | Howell / Freehold (NJ10) | 1102 | 1896 | 2630 | 3109 | 3249 |
| Northern | High Point (NJ59) | 884 | 1490 | 2045 | 2352 | 2384 |
| Forecast: NOAA NCEP Coupled Forecast System model version 2 (CFSv2) forecast system (3.5 months) (USPEST.ORG) | ||||||
(Same material as downloads)
| Nursery Pest Scouting – Growing Degree-day Ranges | (1300-2200 GDD50) | |||||
| CROP TYPE | Common Name | Scientific Name | GDD Min (50F) | GDD Max (95F) | Reference | Developmental / Target Stage |
| Many | Japanese beetle | Popillia japonica | 950 | 2150 | 5 | Adults emerge and feed |
| Turf | Bluegrass billbug | Sphenophorus parvulus | 1094 | 1217 | RU | Larvae (40%) |
| Many | Indian wax scale | Ceroplastes ceriferus | 1145 | – | 6 | Crawlers (1st generation) |
| Many | Oriental Beetle | Anomala orientalis | 1147 | – | 6 | Adult emergence |
| Euonymus | Euonymus Scale | Unaspis euonymil | 1150 | 1388 | 5 | 2nd generation targeted treatments |
| Dogwood | Dogwood sawfly | Macremphytus tarsatus | 1151 | 1500 | RU | Larvae Treatment |
| Tulip | Tuliptree aphid | Illinoia liriodendri | 1151 | 1514 | RU | Nymphs / adults |
| Boxwood | Boxwood leafminer | Monoarthropalpus flavus | 1200 | 1400 | 5 | Larvae Treatment |
| Conifer | Northern pine weevil | Pissodes nemorensis | 1200 | 1400 | 4 | 2nd generation adults active |
| Conifer | Pales weevil | Hylobius pales | 1200 | 1400 | 4 | Adults 2nd generation |
| Conifer | Pine root collar weevil | Hylobius radicis | 1200 | 1400 | 4 | 2nd generation adults active |
| Conifer | White pine weevil | Pissodes strobi | 1200 | 1400 | 4 | 2nd generation adults active |
| Rhododendron | Azalea whitefly | Pealius azaleae | 1250 | 1500 | 5 | Adults/nymphs (2nd generation) |
| Turf | Bluegrass sod webworm | Parapediasia teterrella | 1250 | 1920 | RU | Larvae |
| Birch | Birch Skeletonizer | Bucculatrix canadensisella | 1266 | 1580 | 5 | Typical treatment window |
| Shade trees | European fruit lecanium | Parthenolecanium corni | 1266 | 1645 | 5 | Crawlers |
| Many | Fall webworm | Hyphantria cunea | 1266 | 1795 | 2 | Caterpillars present – larvae treatment |
| Many | Lacebugs ( on hawthorn) | Corythucha cydoniae | 1266 | 1544 | RU | Nymphs / adults |
| Many | Leafhoppers | Species within Cicadellidae | 1266 | 1544 | RU | Nymphs / adults |
| Privet | Privet rust mite | Aculus ligustri | 1266 | 1515 | 5 | Second typical treatment window |
| Conifer | Pine Needle Scale | Chionaspis pinifoliae | 1290 | 1917 | 3 | Crawlers emerge (2nd generation) |
| Many | Two spotted spider mite | Tetranychus urticae | 1300 | 2000 | RU | Nymphs / adults |
| Turf | N. Masked chafer | Cyclocephala borealis | 1377 | 1579 | RU | Adults (90%) |
| Conifer | Hemlock scale | Abgrallaspis ithacae | 1388 | 2154 | 5 | Typical treatment window |
| Lilac | Lilac leafminer | Caloptilia syringella | 1388 | 1644 | 5 | Typical treatment window |
| Conifer | Cooley spruce gall adelgid | Adelges cooleyi | 1500 | 1775 | RU | Adults/nymphs (Douglas Fir) |
| Malus, Prunus, many | Peachtree borer | Synanthedon sp. | 1500 | 1800 | RU | Larvae Treatment |
| Conifer | Pine Needle Scale | Chionaspis pinifoliae | 1500 | – | 4 | Hyaline crawlers = treatment timing |
| Conifer | Nantucket tip moth | Rhyacionia frustrana | 1514 | 1917 | RU | Adults 2nd generation |
| Many | Roundheaded apple tree borer | Saperda candida | 1514 | 1798 | 5 | Typical treatment window |
| Many | Redheaded flea beetle | Systena frontalis | 1570 | 1860 | Udel. | 2nd generation egg hatch |
| Many | Japanese beetle | Popillia japonica | 1590 | 1925 | RU | Adults (90%) |
| Many | White prunicola scale | Pseudaulacaspis prunicola | 1637 | – | 6 | Egg hatch / crawler (2nd generation) |
| Conifer | Rust-mites | Nalepella and Setoptus spp. | 1644 | 2030 | RU | Nymphs / adults |
| Many | Two-banded Japanese weevil | Pseudocneorhinus bifasciatus | 1644 | 2271 | RU | Adults |
| Willow | Willow twig aphids | Lachnus spp. | 1644 | 2271 | 5 | Typical treatment window |
| Conifer | Juniper webworm | Dichomeris marginella | 1645 | 1917 | RU | Larvae Treatment |
| Euonymus | Euonymus Scale | Unaspis euonymil | 1700 | – | RU | Continued 2nd generation treatments |
| Conifer | Cryptomeria scale | Aspidiotus cryptomeriae | 1750 | 2130 | RU, 4 | Crawlers emerge (2nd generation) |
| Many | Obscure scale | Melanaspis obscura | 1774 | – | 6 | Egg hatch / crawler |
| Oaks | Oak skeletonizer | Bucculatrix ainsliella | 1798 | 2155 | RU | Larvae |
| Conifer | Arborvitae leafminer | Argyresthia thuiella | 1800 | 2200 | RU | Larvae Treatment (3rd generation) |
| Mimosa, Honeylocust | Mimosa webworm | Homadaula anisocentra | 1800 | 2100 | RU | Larvae (2nd generation) |
| Conifer | Cooley spruce gall adelgid | Adelges cooleyi | 1850 | 1950 | RU | Galls open (Spruce) |
| Turf | Hairy chinch bug | Blissus leucopterus | 1903 | 2160 | RU | Second generation- 50%- 2nd instars |
| Tulip | Tuliptree aphid | Illinoia liriodendri | 1917 | 2033 | RU | Nymphs |
| Conifer | Zimmerman pine moth | Dioryctria zimmermani | 1917 | 2154 | 5 | Treatment window (adult flight-1700 GDD) |
| Mainly Oaks | Orangestriped oakworm | Anisota senatoria | 1917 | – | 6 | Egg hatch – early instars |
| Conifer | White pine aphid | Cinara strobi | 1991 | 2271 | RU | Adults |
| Rhododendron | Azalea whitefly | Pealius azaleae | 2032 | 2150 | 5 | Adults/nymphs (3rd generation) |
| Maple | Sugar maple borer | Glycobius speciosus | 2032 | 2375 | 5 | Typical treatment window |
| Conifer | Maskell scale | lepidosaphes pallia | 2035 | – | 6 | Egg hatch / crawler (2nd generation) |
| Mainly Tulip | Tulip tree scale | Toumeyella liriodendri | 2037 | 2629 | RU | Crawlers (1st generation) |
| Mainly Magnolia | Magnolia scale | Neolecanium cornuparvum | 2155 | 2800 | RU | Crawlers (1st generation) |
| Locust | Locust borer | Magacyllene robiniae | 2271 | 2805 | 5 | Typical treatment window |
| Poplar and Willow | Poplar and willow borer | Crytorhynchus lapathi | 2271 | 2806 | 5 | Typical treatment window |
| Conifer | Spruce spider mite | Oligonychus ununguis | 2375 | 2806 | 5 | Typical treatment window |
| Note: Growing degree-day values utilize daily average air temperatures with a minimum temperature threshold (a.k.a. ‘base’) of 50F = GDD50 (max. temp. threshold set at 95F). These values are accumulated from a biofix date, such as January or March 1st in the NE USA. Provided GDD50 are scouting ranges and should be truthed. | References | 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 | |||||
| Daily GDD50 = (Max + Min temp.) / 2 – 50 (min temp. threshold) | 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)-evolving GDD ranges | |||||
| Compiled 7-6-2021 – Timothy J. Waller, Ph.D. – Rutgers Cooperative Extension, Cumberland County Nursery Crops – twaller@njaes.rutgers.edu | ||||||
Redheaded flea beetle considerations:
Adults are mating and laying eggs in southern NJ. Contact material applications are still viable to target adults now (if found scouting) but will also be useful when treating larvae prior to emergence from the soil/growing media in a few weeks time. The use of systemics should also be considered to protect foliage from the next generations adults and again late season to guard from first generation adults in the 2022 spring season.
NOTE: The majority of RHFB I have personally observed have been seen later in the evening, especially if the foliage is wet. I have also isolated an anthracnose pathogen (Colletotrichum sp.) from what appeared to be damaged leaves. Thus a complete fungicide – insecticide program needs to be in place if this is a high value crop for your business.
Boxwood blight considerations:
Preventative applications should continue in high value plantings. As with the vast majority of foliar diseases, overhead irrigation plays a major role in reducing the staying power and efficacy of fungicides. Overhead irrigation or rain events also play a critical role in pathogen dispersal and ease of entry by these pathogens into plant tissues. Anything you can do to reduce/limit overhead irrigation in virtually all crops will aid in reducing the overall disease pressure that your plants experience.
Boxwood Blight Risk Model (CLICK HERE) – In 30 seconds you can have a better idea of boxwood blight (and other pathogen) activity in your immediate area!
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- (click on the link – input area code – select closest weather station – check 7-14 prediction – click on graph / table)
Great new resources by Steve Rettke
SURVEY REQUESTS
Contact – Timothy J. Waller – twaller@njaes.rutgers.edu for more information
