April 17, 2023

Spotted lanternfly (SLF) hatch is ON in Southern and Central NJ – ALL New Jersey COUNTIES are now QUARANTINED

Spotted Lanternfly nymphs will be emerging now through the first week of May for Southern and Central New Jersey – reduce their population early in the nursery industry!

Two important notes:

  • Through conversations with nursery operators, state inspectors (NJDOA), and internal agent communications SLF hatch has begun, which indicates a critical time to knock down nymph populations with CONTACT insecticides.
  • The entire state of New Jersey is now within the SLF QUARANTINE!

More information:

 

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September 15, 2022

SLF: 2022 Management Recommendations in Vineyards

by Katarzyna Madalinska and Anne L. Nielsen

Adult SLF are moving into vineyards from the surrounding landscape. The number of SLF on each vine varies greatly within each vineyard and locations in the state. In most vineyards in NJ and PA there is a strong border effect with numbers highest along the outside rows. However, the orientation and shape of your vineyard influences border effects. SLF are actively feeding on grapevines and will continue to feed for 1-2 months. Most SLF are in the upper canopy and as the grapes start to store carbohydrates for the winter, SLF will move down the vine, eventually feeding at the base of the vine. Research suggests that feeding by adult SLF may harm primary bud formation the following season and reduce winter hardiness. There is not a specific treatment threshold, but a good rule of thumb is 10 SLF per vine. Movement into the vineyards will continue for several weeks so multiple insecticide applications may be needed.

Treatment at this time of year is of course complicated by pre-harvest intervals (PHI) for each insecticide and grape variety. It is important to remember that SLF will feed on vines post-harvest. There are several effective insecticides available with pre-harvest intervals and residual activity (Table 1). When treating vines pre-harvest, dead SLF are commonly observed in the clusters. Post-harvest, insecticides such as Danitol or Brigade/Bifenture/bifenthrin have the longest residual activity and are expected to reduce feeding.

There are several reasons to manage adult SLF in September and October during peak movement.

  1. Adults feed on the canes, cordon, and trunk of grape vines. Excessive feeding has been shown to lower winter hardiness by >1.5°C.
  2. SLF females lay egg masses in October. Killing females prior to egg laying will decrease population growth the following year.

Table 1. Effectiveness of Insecticides Against Spotted Lanternfly Adults. Modified recommendations from Leach et al. Crop Protection 2019 v. 24  DOI:10.1016/j.cropro.2019.05.027

Trade name Active ingredient SLF Activity Rate per acre Seasonal Allowance Residual Activity PHI

(days)

 REI

(hrs)

 Labeled for SLF?
Mustang Maxx 0.8EC cypermethrin Good 4 oz 24 oz <3 1 12 Yes, 2(ee)
Scorpion 35SL dinotefuran Excellent 5 oz. 20.9 oz <7 1 12 Yes, 2(ee)
Actara 25WDG thiamethoxam Excellent 3.5 oz 7.0 oz <14 5 12 Yes, 2(ee)
Carbaryl 4L carbaryl Excellent 1-2 qt 10 qt 7 7 12 No
Avaunt 30DG indoxicarb Fair 6 oz 12 oz 7 7 12 Yes, 2(ee)
Danitol 2.4EC fenpropathrin Excellent 16-21.33 oz 42.66 oz >26 21 24 Yes, 2(ee)
Brigade 2EC bifenthrin Excellent 3.2-6.4 oz. 6.4 oz 21 30 12 Yes, 2(ee)

 

There are several reasons to manage adult SLF in September and October during peak movement.

  1. Adults feed on the canes, cordon, and trunk of grape vines. Excessive feeding has been shown to lower winter hardiness by >1.5°C.
  2. SLF females lay egg masses in October. Killing females prior to egg laying will decrease population growth the following year.
Filed Under: Fruit, Uncategorized, Wine Grape Tagged With: ,
May 17, 2022

Management Recommendations SLF nymphs in 2022

By Katarzyna Madalinska and Anne Nielsen

New Jersey is currently in its 5th year of invasion from spotted lanternfly. Populations are now widespread throughout the state and have established in almost every county in NJ. SLF pressure is variable throughout NJ’s counties, and we do not currently have a threshold for management of nymphs.

1st instar SLF in NJ vineyard – photo by K. Madalinska

SLF nymphs are hatching throughout the state and will continue to do so in the coming weeks. Despite seeing nymphs within the vineyard, we do not recommend immediate treatment at this time. Hatch will occur over a multiple week period depending on the site of egg masses and exposure. The early instars feed on new growth, particularly the underside of leaves and shoots. At this point there is no evidence that early instar feeding results in plant injury or yield loss. Peak abundance of SLF nymphs in vineyards is during their 1st to 2nd instars approximately and 2-3 weeks after the first hatch. Management during their 2nd instar will target the highest number of individuals and prevent additional treatments against nymphs. This timing typically coincides with other key pests within the vineyard, such as grape berry moth and Japanese beetle. Many broad-spectrum insecticide options for grape berry moth or Japanese beetle will also effectively kill SLF nymphs (see table) and insecticides against SLF will not be needed until the adult stage.

Trade name Active ingredient Class Rate per acre Seasonal Allowance SLF* GBM JB
Brigade 2EC bifenthrin Pyrethroid 3.2-6.4 oz 6.4 oz E* E
Actara thiamethoxam Neonicotinoid 3.5 oz 7.0 oz E* G
Assail 30SG acetamiprid Neonicotinoid 2.5-5.3 oz 2 times G G F
Carbaryl 4L carbaryl Carbamate 1-2 qt 10 qt E G G
Avaunt indoxicarb Oxadiazine 6 oz 12 oz. E* G G
Danitol 2.4EC fenpropathrin Pyrethroid 16-21.33 oz 42.66 oz E* E E
Belay clothianidin Neonicotinoid 2.0–6.0 oz. 12 oz. G G G
BaythroidXL cyfluthrin Pyrethroid 1.6-3.2 oz 12.8 oz E E

Always consult the label for further instructions.

*2(ee) approved for SLF in NJ grapes

E = excellent control
G = good control
F = fair control

Filed Under: Uncategorized, Wine Grape Tagged With: ,
April 18, 2022

Spotted Lanternfly egg hatch is coming or here now – Critical knockdown of nymphs

Spotted Lanternfly nymphs will be emerging now through the first week of May for Southern and Central New Jersey – reduce their population early in the nursery industry!

 

Through conversations with nursery operators, state inspectors (NJDOA), and internal agent communications four shade trees represent the vast majority of nursery stock with adult SLF eggs. This means we should be targeting these trees early – treating for nymphs as they emerge from the egg masses and before they move on to more tender hosts.

The vast majority of shade trees with egg masses in NJ are:

  1. Red maple – huge proportion
  2. Birch
  3. Willow
  4. Styrax

Generally, adults are laying eggs on these four nursery crops late summer/fall, then as the nymphs emerge (April/May) they move to more tender growth, often onto understory plants, weeds, hedge rows, roses (wild and cultivated), and tender herbaceous and perennial plants (May, June, early July). This means we have a very short window to target a large percentage of nymph emergence on these four crops with Contact Insecticides. Scout these areas for nymphs over the next few weeks, and be at the ready to treat immediately. 

Be ready to target nymph populations early this season with contact materials 

Once the nymphs have moved on to their favored 1st-3rd instar crops (herbaceous, perennial, roses, grapes, etc.) they will then begin to move back to these four shade trees (and other woody hosts) as 4th instars (red-coloration, mid/late July) and adults (August) that will ultimately mate and lay eggs (September/October), repeating the cycle.

Systemic materials – Generally systemics are best utilized when targeting late instars and adult populations (both born at the nursery and flying in from outside), often requiring approximately 3-4 weeks prior to anticipated insecticidal activity. In the nursery setting we may already be utilizing systemic materials to treat other insect populations, offering some level of protection from the nymphs migrating away from theses four shade trees, towards their favored feeding locations. In operations where egg masses have been abundant, treating with systemic materials, when appropriate should be considered to reduce local populations in addition to targeting nymphs with contact materials.

Penn State – Spotted Lanternfly Management Guide (click here) – Contains the most complete list of labeled systemic and contact insecticides for SLF

Note – applications during bloom for specific host crops should be avoided to protect pollinators. 

 

Additional information: 

We are collectively trying to avoid crippling load-by-load phytosanitary inspections: 

WE as an industry are in this together, in order to safeguard our industry please do the following:

  1. SLF Training Permits for hang-tags (click here) are required for each company driver who delivers your plants out-of-state. This training is relatively simple and you can also obtain Training materials to educate your employees (click here)
  2. Scout every plant for ANY SLF life stages – from dead adults to egg masses. REMOVE life stage prior to shipment and train employees to know the various appearances of SLF egg masses. Use this guide – SLF EGG MASS GUIDE – USE FOR TRAINING (click here to download) (print and hang up / distribute to personnel)

 

Filed Under: Landscape, Nursery, & Turf, Nursery, Turf, Uncategorized Tagged With: , , , , , , , , , ,
April 14, 2022

Nursery Pest Updates and Scouting next two weeks – initiate Red-headed flea beetle systemics now for Central and Southern NJ

This post covers three topics:

  1. Control and timing of applications for Red-headed flea beetle (RHFB) – Systemic materials should be used now to target emerging adults in May. 
    1. Please refer to this resource for timing and material selection: RHFB timeline using GDD, material selection, print-out ready (click here)
    2. Combination of resources from Danny Lauderdale (NC State), Brian Kunkel (UDel.), Tim Waller (RU)
  2. Seasonal reminders:
    1. Protectant, broad-spectrum ‘cover-sprays’ should be initiated ASAP or as plastic is removed / crops can be accessed
    2. SLF egg masses: We are all in this together should be remembered when it comes to checking loads for SLF.
      1. SLF EGG MASS GUIDE – USE FOR TRAINING (click here to download, hang up for employees)
      2. Refer to this post “Don’t let Spotted Lanternfly Impact Spring Shipping” for additional information 
  3. Pest Scouting for 100-200 Growing Degree-days (approx. next two weeks in Southern and Central NJ). 
    1. Refer to this post “Obtaining your local growing degree-days” for additional information 

Growing degree-days as  4/12/22 (~Next two weeks)

Projected GDD50 accumulation as of 4/13/2022 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.
Region Location Station 13-Apr 1-May 1-Jun
South Upper Deerfield NJ50 116 236 660
Central Howell / Freehold NJ10 114 200 553
North High Point NJ59 35 67 313
Forecast: NOAA NCEP Coupled Forecast System model version 2 (CFSv2) forecast system (3.5 months) (USPEST.ORG)

 

Crop type Common Name Scientific Name GDD Min (50F) GDD Max (95F) Reference Developmental / Target Stage
Conifer Pine engraver (Ips bark beetle) Ips spp. 100 150 4 1st adults active
Conifer Balsam twig aphid Mindarus abietinus 100 150 4 Stem mothers present (control target)
Conifer European pine sawfly Neodiprion sertifer 100 195 4 1st larvae active
Andromeda Andromeda lace bug Stephanitis takeyai 115 279 RU Nymphs (1st generation)
Azalea Azalea lace bug Stephanitis pyrioides 118 372 RU Nymphs (1st generation)
Conifer Larch casebearer Coleophora laricella 120 150 4 Egg hatch
Elm, Service berry Woolly elm aphid Eriosoma americana 121 246 2 (6) Control target
Birch Birch leafminer Fenusa pusilla 123 290 RU Adults – egg laying
Many Gypsy moth Lymantria dispar 145 200 4 Egg hatch, 1st larvae
Holly Holly leaf miner Phytomyza ilicis 147 265 RU Adults – egg laying
Many Cankerworms, inch-worms, loopers (many) 148 290 2 Larvae treatment
Yews, Rhododendrons, many Black Vine Weevil Otiorhynchus sulcatus 148 400 2 Pupation / Adult emergence
Lilac, ash, privet, many Lilac / Ash Borer Podosesia syringae 148 299 2 Adult flight
Dogwood, many Dogwood Borer Synanthedon scitula 148 700 2 Adult activity
Conifer Hemlock woolly adelgid Adelges tsugae 150 150 RU Eggs and 10% hatch
Conifer Spruce needleminer Endothenia albolineana 150 200 4 1st larvae active
Conifer Spruce spider mite Oligonychus ununguis 150 175 4 1st egg hatch
Conifer Balsam gall midge Paradiplosis tumifex 150 300 4 Adults laying eggs
Witchhazel, River birch Spiny witchhazel gall aphid Hamamelistes spinosus 171 – 6 Control target
Birch Birch Leafminer Fenusa pusilla 175 215 4 1st adults active
Birch Birch leafminer Fenusa pusilla 190 290 RU Larvae (1st generation)
Conifer Spruce spider mite Oligonychus ununguis 190 363 RU Immatures/Adults
Rhododendron Rhododendron gall midge Clinodiplosis rhododendri 192 363 RU Larvae
Honeylocust Honeylocust pod gall midge Dasineura gleditchiae 192 229 RU Larvae
Privet Privet thrips Dendrothrips ornatus 192 618 2 Typical treatment window
Holly *Native holly leafminer Phytomyza ilicicola 192 298 2 Egg hatch
Holly Holly leafminer Phytomyza ilicis 192 290 RU Egg hatch
Willows, Cottonwood, Poplar Imported willow leaf beetle Plagiodera versicolora 192 448 RU Larvae/Adults
Larch Larch sawfly Pristophora erichsonii 192 299 2 Typical treatment window
Andromeda Andromeda lacebug Stephanitis takeyai 192 303 RU Adults
Rhododendron Rhododendron borer Synanthedon rhododendri 192 298 2 Typical treatment window
Conifer Cooley spruce gall adelgid Adelges cooleyi 200 310 4 1st galls visible – Spruce
Spruce Spruce budworm Choristoneura fumiferana 200 300 5 Larvae
Conifer Douglas fir needle midge Contarinia pseudotsugae 200 400 3 Adults emerge from soil
Lilac, ash, privet, many Lilac / Ash Borer Podosesia syringae 200 299 RU Adults – 1st Treatment
References RU Rutgers Cooperative Extension – Landscape IPM Notes
Daily GDD50 =                                                                                                             (Max + Min temp.) / 2 – 50 (min temp. threshold)                             (Simple average growing degree-day, min. 50F, max 95F) 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)-evolving GDD ranges
Compiled by – Timothy J. Waller, Ph.D. – Rutgers Cooperative Extension, Cumberland County Nursery Crops – twaller@njaes.rutgers.edu

Please Download these resources: (The scouting guide is for you to print and keep on hand…these are just updates)

Nursery and Landscape Pest Scouting Guide 2022 PDF (note this contains conifer pests as well)

Conifer Pest Scouting Guide 2022 PDF

Contact if seeing insects at different times: twaller@njaes.rutgers.edu (or call the Cumberland County Extension Office – 856-451-2800)

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March 22, 2022

Pest Scouting Update – 25 to 150 GDDs Plus Printable resources!

Additional resource: SLF EGG MASS GUIDE – USE FOR TRAINING (click here to download)

We have compiled the GDD resources into one single document – please download and print multiple copies of this for yourself and employees in efforts to best scout for these insect pests. These guides do not dictate when to spray, rather they inform scouting ranges for insect pests, vulnerable life-stages, and overlapping timeframes for multiple troublesome pests.

Please Download these resources:

Nursery and Landscape Pest Scouting Guide 2022 PDF (note this contains conifer pests as well)

Conifer Pest Scouting Guide 2022 PDF

Refer to this post “Obtaining your local growing degree-days” for additional information 

We will be making regular announcements throughout the season, however we wanted you to have this beta-version of the compiled growing-degree day information. This will be updated and modified throughout the season – PLEASE let me know what difference you are seeing in the field so we can continue to make this resource better for all of us.   

Contact: twaller@njaes.rutgers.edu (or call the Cumberland County Extension Office – 856-451-2800)

Growing degree-days as of writing this 3/22/22 (using USPEST.org weather station codes):

  • Southern (NJ50): 74
  • Central (NJ10): 72
  • Northeastern (Greater NYC Metro area (D6302): 41
  • Northwestern (NJ59): 21
  • Crop type Common Name Scientific Name GDD Min (50F) GDD Max (95F) Reference Developmental / Target Stage
    Conifer Zimmerman pine moth Dioryctria zimmermani 25 100 3 1st larvae
    Conifer Cooley spruce gall adelgid Adelges cooleyi 25 120 3 Spring control of overwintering stage
    Conifer Eastern spruce gall adelgid Adelges abietis 25 100 3 Spring control of overwintering stage
    Conifer Northern pine weevil Pissodes approximatus 25 100 4 1st adults active
    Conifer Zimmerman pine moth Dioryctria zimmermani 25 100 3 1st larvae active
    Conifer Cooley spruce gall adelgid Adelges cooleyi 25 120 3 Spring control of overwintering stage
    Conifer White pine weevil Pissodes strobi 25 220 4 1st adults active
    Shade trees European fruit lecanium Parthenolecanium corni 35 145 2 Spring control of overwintering stage
    Many, evergreen Euonymus scale Unaspis euonymi 35 120 2 Spring control of overwintering stage
    Conifer European pine sawfly Neodiprion sertifer 35 145 1 Hatched larvae
    Conifer Fletcher scale Parthenolecanium fletcheri 35 148 2 Spring control of overwintering stage
    Conifer European pine shoot moth / borer Rhyacionia buoiana 50 220 4 1st larvae active
    Maples Maple bladdergall mite Vasates quadripedes 58 148 2 Spring control of overwintering stage
    Honeylocust Honeylocust plant bug Diaphnocoris chlorionis 58 246 2 Nympths / adults active
    Conifer Pine tortoise scale Toumeyela parvicornis 58 148 2 Cralwer activity
    Conifer Pine bark adelgid Pineus strobi 58 618 2 Spring control of overwintering stage
    Conifer Balsam twig aphid Mindarus abietinus 60 100 4 Egg hatch
    Many Southern red mite Oligonychus ilicis 69 157 RU Spring hatch
    Conifer Eastern pine shoot borer Eucosma gloriola 75 200 4 1st adults active
    Malus, Prunus, many Eastern tent caterpillar Malacosoma americanum 90 190 2 Larvae treatment before tents apparent
    Many Gypsy moth Lymantria dispar 90 448 RU Larvae treatment (early instars)
    Conifer Cooley spruce gall adelgid Adelges cooleyi 90 180 4 1st adults active – Douglas fir
    Malus, Prunus, many Eastern tent caterpillar Malacosoma americanum 90 190 2 Larvae treatment before tents apparent (near 150-GDD50)
    Malus, Prunus, many Eastern tent caterpillar Malacosoma americanum 90 190 2 Larvae treatment before tents apparent (near 150-GDD50)
    Conifer Balsam twig aphid Mindarus abietinus 100 150 4 Stem mothers present (control target)
    Conifer Pine engraver (Ips bark beetle) Ips spp. 100 150 4 1st adults active
    Conifer European pine sawfly Neodiprion sertifer 100 195 4 1st larvae active
    Pieris Andromeda lace bug Stephanitis takeyai 115 279 RU Nymphs (1st generation)
    Azalea Azalea lace bug Stephanitis pyrioides 118 372 RU Nymphs (1st generation)
    Conifer Larch casebearer Coleophora laricella 120 150 4 Egg hatch
    Elm, Service berry Woolly elm aphid Eriosoma americana 121 246 2 (6) Control target
    Elm, Service berry Woolly elm aphid Eriosoma americana 121 246 2 (6) Control target
    Birch Birch leafminer Fenusa pusilla 123 290 RU Adults – egg laying
    Many Gypsy moth Lymantria dispar 145 200 4 Egg hatch, 1st larvae
    Holly Holly leaf miner Phytomyza ilicis 147 265 RU Adults – egg laying
    Many Cankerworms, inch-worms, loopers (many) 148 290 2 Larvae treatment
    Lilac, ash, privet, many Lilac / Ash Borer Podosesia syringae 148 299 2 Adult flight
    Yews, Rhododendrons, many Black Vine Weevil Otiorhynchus sulcatus 148 400 2 Pupation / Adult emergence
    Dogwood, many Dogwood Borer Synanthedon scitula 148 700 2 Adult activity
    Conifer Spruce spider mite Oligonychus ununguis 150 175 4 1st egg hatch
    Conifer Spruce needleminer Endothenia albolineana 150 200 4 1st larvae active
    Conifer Balsam gall midge Paradiplosis tumifex 150 300 4 Adults laying eggs
    Conifer Hemlock woolly adelgid Adelges tsugae 150 150 RU Eggs and 10% hatch
    Conifer Spruce spider mite Oligonychus ununguis 150 175 4 1st egg hatch
    Conifer Spruce needleminer Endothenia albolineana 150 200 4 1st larvae active
    Conifer Balsam gall midge Paradiplosis tumifex 150 300 4 Adults laying eggs
    Conifer Hemlock woolly adelgid Adelges tsugae 150 150 RU Eggs and 10% hatch
    Conifer Spruce spider mite Oligonychus ununguis 150 175 4 1st egg hatch
    Conifer Spruce needleminer Endothenia albolineana 150 200 4 1st larvae active
    Conifer Balsam gall midge Paradiplosis tumifex 150 300 4 Adults laying eggs

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
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 by – Timothy J. Waller, Ph.D. – Rutgers Cooperative Extension, Cumberland County Nursery Crops – twaller@njaes.rutgers.edu

 

Filed Under: Landscape, Nursery, & Turf, Nursery, Plant Diagnostic Lab, Turf Tagged With: , , , , , , ,