Search Results for: spotted lanternfly

June 14, 2023 Tim Waller, William Errickson and Steven K. Rettke

Nursery Pest and Disease Update 6/15/2023

In this edition:

Insects:
- MORE Scale crawlers emerging
- Borers
- Beetles
Diseases:
- Oomycete root diseases (Phytophthora, Pythium, Phytopythium)
- Leaf spots / foliage diseases
- Boxwood Blight – reminder
- Virus observations
Nutrient Management
- Managing Soluble Salts by monitoring EC
- Plant Tissue analysis
Plant Spotlight:
- American Holly (Ilex opaca)
Cumberland Nursery / NJNLA – Twilight: tonight (6/15) for NURSERYMEN ONLY (contact twaller@njaes.rutgers.edu or 856-451-2800 Ext. 1. for details)

Please click “read more” below to get updates on pests, diseases, and other important resources for the week of 6/15/2023.

May 14, 2023 Tim Waller, William Errickson and Steven K. Rettke

Nursery Pest and Disease Update 5/15/2023

In this edition:

Insects:
- Scale crawler emergence
- Borer insects
- Upcoming problem pests / Redheaded flea beetle / SLF / Pest Scouting Guides
Diseases:
- Leaf spot / foliage disease management
- Fire blight on Rosaceous hosts
- Canker fungi
- Boxwood blight
- Oomycete root diseases (Phytophthora, Pythium, Phytopythium)
Plant Spotlight:
- NJ native azalea species

Please click “read more” below to get updates on pests, diseases, and other important resources for the week of 5/15/2023.

April 27, 2023 Tim Waller

Nursery Pest Update 4/25 – 5/5/2023

Please note: The Rutgers Nursery and Green Industry Working Group is working to deliver regular pest and disease updates throughout the season. These will be in addition to important alerts, critical topics, and pesticide credit opportunities. This tool is made for you, the commercial agriculture business, so please let us know if there are particular topics you would like to see included in the regular update.

Email: twaller@njaes.rutgers.edu Phone: 856-451-2800 Ext. 1.

Insect Pests

Projected GDD50 accumulation as of 4/25/2023 (these change throughout the season!)
Region	Location	25-Apr	1-May	1-Jun	1-Jul	1-Aug
Southern	Upper Deerfield (NJ50)	251	281	682	1370	2218
Central	Howell / Freehold (NJ10)	188	207	537	1160	1957
Northern	High Point (NJ59)	142	143	371	864	1507
Forecast: 7-month NMME based seasonal climate forecast (USPEST.ORG)

Please download and print the Rutgers Nursery and Landscape Pest Scouting Guide or Conifer and Christmas Tree Pest Scouting Guide and refer to this post “Obtaining your local growing degree-days (GDD)” for additional information. (See pest scouting guides for complete list of references)

Please SHARE what you SEE!! If you see a pest, disease, otherwise interesting or troublesome issue please report it to the Working Group by following the QR Code on the front of the Pest Scouting Guides or by filling out this reporting form.

Please continue reading for much more detailed and important information!

February 16, 2023 Meredith Melendez

Organic Grower Advisory 3/7 Registration Open

The Rutgers Organic Grower Advisory meeting will be held on March 7th. This meeting has served to increase communication between commercial farms using organic practices and Rutgers Cooperative Extension agricultural agents and specialists. This year the meeting will be held both in-person and online. We have a AV system that will allow for better sound quality for all participants. Please see details below, and use the Qualtrics link to register if you plan to attend.

March 7th 10:00 – 2:00
Rutgers Cooperative Extension of Mercer County
1440 Parkside Avenue, Ewing NJ 08638
OR Online via Zoom

In-person attendees will have a pizza lunch option at a cost of $5.00 per person, payable at the door.

Registration deadline is March 3rd, register here!

Examples of hot topics for discussion from the 2021 Organic Grower Advisory meeting are:
• Weed control updates
• Organic animal feed
• Allium leaf miner
• Spotted lanternfly
• Organic sweet corn
• Disease control
• Organic certifications

Filed Under: Organic Production

September 15, 2022 Anne Nielsen

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.

Adults feed on the canes, cordon, and trunk of grape vines. Excessive feeding has been shown to lower winter hardiness by >1.5°C.
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.

Adults feed on the canes, cordon, and trunk of grape vines. Excessive feeding has been shown to lower winter hardiness by >1.5°C.
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: SLF, Spotted Lanternfly

May 17, 2022 Anne Nielsen

Management Recommendations SLF nymphs in 2022

By Katarzyna Madalinska and Anne Nielsen

New Jersey is currently in its 5^th 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 2^nd instars approximately and 2-3 weeks after the first hatch. Management during their 2^nd 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: SLF, Spotted Lanternfly