This Rutgers Plant & Pest Advisory blog will review a few of the landscape summer pests specific to mostly oak trees (Quercus). The scarlet oak sawfly will be discussed first, followed by the oak spider mite & finally the oak lace bug. All three pest species have multiple generations during the summer months & therefore can be observed throughout most of the season. None of the pest species are usually considered to be life-threatening to oak hosts but they can cause significant & undesirable aesthetic injuries. However, it could be stated that these pests may have bark, but they have little bite. Therefore, with large oak trees the spraying of many gallons of pesticides would not be justified.
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Nursery – Pest Scouting Guide for July – BWB and RHFB Reminders
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
Mimosa Webworm Activity Begins
Mimosa Webworm (Homadaula anisocentra) = (880-1200 GDD = 1st generation egg hatch): The overwintering pupal cocoons of this non-native caterpillar emerged as adults last June & eggs have been laid on leaflets or small twigs of honeylocust (Gleditisia tricanthos ) trees in NJ. This caterpillar also feeds on mimosa trees, but since honeylocust plantings in the urban environment are more common, we usually encountered them on these trees. Within many areas of the state, the early, initial 1st generation webbings by 1st instar caterpillars are now becoming noticeable at the outer edges of the leaf canopy.
Don’t Let Your Guard Down With Farm Worker Health
The COVID-19 pandemic highlighted the critical and essential role of farm labor in getting food from farm to plate. However, health concerns should not stop with a negative COVID test or vaccine, especially if an employee or family member is exhibiting any of the ‘flu-like’ symptoms that are associated with corona virus.
From the Vermont Law School Center for Agriculture and Food Systems (CAFS) – “The CAFS launched the Food System Worker Law and Policy Project in 2021 with research focused on farmworkers, who—despite forming the backbone of a trillion-dollar industry in the U.S.—face a level of occupational risk unrivaled by most workers. From repeated exposure to pesticides and extreme heat, …. ” Their newly published “report titled “Essentially Unprotected: A Focus on Farmworker Health Laws and Policies Addressing Pesticide Exposure and Heat-Related illness,” … May 2021, provides an overview of the findings as well as policy recommendations that are urgently needed to protect farmworkers.”
Typically not seen until July, we’ve already had 3 heat waves beginning in May that expose workers to a number of potential health risks that may present very similar symptoms and can be equally health, and even life, threatening. Published studies from the Rutgers Institute of Earth, Ocean, and Atmospheric Sciences suggest growing numbers of people worldwide are at risk of heat stress and related complications, including farmers and ag laborers working in high heat and humid conditions. Last year, OSHA-NIOSH released a Heat Index App (in English and Spanish at the Apple App Store or Google Play) featuring:
- A visual indicator of the current heat index and associated risk levels specific to your current geographical location
- Precautionary recommendations specific to heat index-associated risk levels
- An interactive, hourly forecast of heat index values, risk level, and recommendations for planning outdoor work activities in advance
- Editable location, temperature, and humidity controls for calculation of variable conditions
- Signs and symptoms and first aid information for heat-related illnesses
For more information about safety while working in the heat, see OSHA’s heat illness webpage, including online guidance about using the heat index to protect workers.
In addition to heat stress, harvesting and other activities along field edges, including going into the woods instead of using a portable bathroom facilities, create a high risk for tick bites which can also carry a number of diseases, many as or more debilitating than Lyme disease. It is critical for your employees’ health and well-being to get proper diagnosis and treatment for all of these ailments. This table illustrates how many tick-born diseases, as well as heat stress, all have potential symptoms very similar to those of COVID-19. Each is linked to additional resources at the CDC. In many cases, it may be the ‘other symptoms’ that may be unique to each disease and assist a medical practitioner with correct identification and lead to better verification with further testing.
Disease > Symptoms v |
COVID-19 | Heat Stress | Lyme Disease | Ehrlichiosis | Babe- biosis | Powas-san | Rocky Mtn Spotted Fever |
Vector* | Human | Black-legged Tick (a.k.a. Deer Tick) (I. scapularis) | Lone Star Tick (A. americanum) & Black-legged | Black-legged Tick | Ground hog(I. cookei), Squirrel (I. marxi) & Black-legged Ticks | American Dog Tick (D. variabilis) | |
Fever or chills | X | X | X | X | X | X | X |
Cough | X | X | |||||
Shortness of breath/difficulty breathing | X | ||||||
Fatigue | X | X | X | X | |||
Muscle/body aches | X | X | X | X | X | X | |
Headache | X | X | X | X | X | X | X |
New loss of taste or smell | X | ||||||
Sore throat | X | ||||||
Congestion or runny nose | X | ||||||
Nausea/vomiting | X | X | X | X | X | X | X |
Diarrhea | X | X | |||||
Rash | X | X | X | ||||
Other symptoms | X | X | X | X | X | X | |
Potentially Deadly/Disabling |
X | X | X | X | X | X | X |
*NOTE – main vector listed, but many tick born diseases may be vectored by other species of ticks, or different species causing same disease may be carried by different tick species.
Additional Vaccination Opportunities Across the State This Weekend
Last Friday, Governor Murphy announced that the State has reached the goal of having 70% adults fully vaccinated. Meanwhile, many areas across New Jersey still see vaccination rate below 70%. In addition to the Atlantic City rodeo event announced yesterday, the NJ Dept of Health shared these additional vaccination events/sites that will occur throughout the state this weekend:
- The Mobile Command Center (vaccination van) will be in Irvington on Saturday 6/26, at Irvington Park, Lyons Avenue and Grove Street, from 10:30AM to 1:30PM
- In Trenton on Saturday 6/26 there will be COVID-19 vaccines, music, giveaways, and a lot of fun at 416 Bellevue Avenue, Trenton, 10:00 AM – 5:00 PM
- Vaccine clinic at Rodeo in Atlantic City on Sunday 6/27 at Surf Stadium, 545 North Albany Avenue, Atlantic City, 3PM to 7PM.
Additionally, this weekend and early next week, there will be pop-up vaccination sites in Trenton, Camden, Ewing, Woodbridge, Long Branch, Lakewood, Hackensack, and Paterson.
Saturday 6/26, Grateful for the Shot pop-up clinics –
- Ewing Township, 10am to 1pm – Faith Deliverance Cathedral Church, 15 Keswick Ave, Ewing Township, NJ 08638
- Woodbridge Township, 1pm-4pm – Muslim Community of New Jersey, 15 South Second Street Fords, NJ 08863
- Long Branch City, 10am-12pm – St. Michael’s Roman Catholic Church, 800 Ocean Avenue, Long Branch, NJ 07740
- Lakewood, 9am-5pm – Lakewood Town Square, Clifton Avenue & Third Street, Lakewood, NJ 08701
Sunday 6/27, Grateful for the Shot pop-up clinics –
- Trenton, 9am to 11am – Parish of Our Lady of the Angels, 540 Chestnut Ave Trenton, NJ 08611
- Hackensack, 2pm to 5pm – Redeemed Christian Church of God The King’s Court, 81 Trinity Pl, Hackensack, NJ 07601
- Orange Township, 11am to 3 pm – First Shiloh Baptist Church, 424 Main St, City of Orange, NJ 07050
Monday 6/28, Grateful for the Shot pop-up clinics –
- Paterson City, 4pm to 7pm – Templo Shalom, 586 Main St, Paterson, NJ 07503
Tuesday 6/29, Grateful for the Shot pop-up clinics –
- Paterson City, 3pm to 6pm – Calvary Baptist Church, 575 E 18th St, Paterson, NJ 07514
Free Vaccinations at Atlantic City Rodeo Event – Sunday, June 27
On Sunday, June 27, there will be a free COVID-19 vaccination event during a rodeo being held at the Surf Stadium (545 North Albany Ave, Atlantic City). No appointments are needed and walk-ups are welcome. Both Pfizer for those ages 12 and older (1st and 2nd doses) and J&J for those 18 and older will be available. No ID documentation is required and there will be no impact on immigration status. More details are available in the attached flyers (in English and Spanish) that can be printed, posted and/or handed out for you, your family and farm employees.
COVID-19 vaccines are safe, effective and free. Get vaccinated!