- Northern Corn Leaf Blight has been reported in southern and northern New Jersey. For more information please check the Vegetable IPM Update by clicking here.
- Southern Blight has been reported in sugar beet in southern New Jersey.
- Bacterial wilt is being reported on multiple cucurbit crops in New Jersey.
- Phytophthora blight is being reported in pepper and cucurbit crops. For more information on Phytophthora blight control please click here.
- Pepper anthracnose is being reported in southern New Jersey. For more information on preparing for pepper anthracnose please click here.
- Cucurbit downy mildew has been reported on cucumber (6/16/21) and cantaloupe (6/22/21) in southern New Jersey. There have been no reports of CDM on other cucurbit hosts in the region to date. For more information on CDM and its control please click here. To track the progress of CDM please visit the CDM forecasting website.
- No reports of Late blight in the region. To track the progress of Late blight in the US please click here.
- Cucurbit powdery mildew has been reported on summer squash, butternut, and spaghetti squash as we are now headed into mid-summer. Please scout fields on a regular basis and initiate a preventative fungicide program if you haven’t already done so. For more information on CPM control please click here.
- Bacterial leaf spot (BLS) continues to be reported on bell and non-bell peppers in southern New Jersey. For more information on our continuing survey for BLS and copper resistance detection in tomato and pepper please click here.
- For an update on Dickeya dianthicola research in potato please click here.
- The 2020/2021 Commercial Vegetable Production Recommendations Guide is available for free online.
- For a quick review on managing fungicide resistance development using tank mixes and fungicide rotations, and information on FRAC group 4, FRAC group 7, and FRAC group 3 and FRAC group 11 fungicides please click on hyperlinks.
Archives for August 2021
Vegetable Disease Update – 8/05/21
Vegetable IPM Update 08/04/21
Sweet Corn
European corn borer (ECB) moths have been captured at a few more locations over the past week, although recording sites are relatively few and numbers are very low. ECB population maps will resume if second flight catches rise to high enough numbers.
The highest nightly trap catches of ECB for the week ending 08/04/21 are as follows:
Blairstown 1 | Hillsborough 1 | New Egypt 1 |
Downer 1 | Medford 1 | |
Flanders 1 | Milltown 1 |
Nursery – Pest Scouting Guide for August – Reminders – Need a few more nurseries for Phytophthora sampling
NURSERY PEST SCOUTING GUIDE – August (1300-2200 GDD50)
Please download and print the pest scouting guide resource (printable version of the information below for your desk or truck) –(click on the link and then print):
- Pest Scouting Guide August 2021 (1600-300 GDD50 )
- To determine your local growing degree-days, please review this post “Obtaining your local growing degree-day information”
Projected GDD50 accumulation as of 8/4/2021 | ||||||
Region | Location | 1-Aug | 1-Sep | 1-Oct | 1-Nov | – |
Southern | Upper Deerfield (NJ50) | 2145 | 2931 | 3477 | 3682 | – |
Central | Howell / Freehold (NJ10) | 1896 | 2630 | 3109 | 3249 | – |
Northern | High Point (NJ59) | 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)
Pest Scouting – Growing Degree-day Ranges | (1600-3000 GDD50) | |||||
CROP TYPE | Common Name | Scientific Name | GDD Min (50F) | GDD Max (95F) | Reference | Developmental / Target Stage |
Many | Redheaded flea beetle | Systena frontalis | 1570 | 1860 | Udel. | 2nd generation egg hatch |
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 | Prophylactic 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) |
Many | Redheaded flea beetle | Systena frontalis | 1878 | 2318 | Udel. | 2nd generation Adults feeding |
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) |
Euonymus | Euonymus Scale | Unaspis euonymil | 2235 | – | 6 | Egg hatch / crawler (2nd 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 – fall activity |
Many | Southern red mite | Oligonychus ilicis | 2500 | 2700 | 5 | Typical treatment window |
Maple | Japanese maple scale | Lopholeucaspis japonica | 2508 | – | 6 | Egg hatch / crawler (2nd generation) |
Yew, many conifers | Fletcher Scale (Yew) | Parthenolecanium fletcheri | 2515 | 2800 | RU | Fall control of overwintering stage |
Conifer | Elongate hemlock scale | Fiorinia externa | 2515 | 2625 | RU | Typical treatment window – fall activity |
Hardwoods | Fall webworm | Hyphantria cunea | 2793 | – | 6 | Egg hatch / crawler (2nd generation) |
Conifer | Cooley spruce gall adelgid | Adelges cooleyi | 2800 | 3000 | 3 | Fall control of overwintering stage |
Conifer | Eastern spruce gall adelgid | Adelges abietis | 2800 | 3000 | 3 | Fall control of overwintering stage |
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 8-04-2021 – Timothy J. Waller, Ph.D. – Rutgers Cooperative Extension, Cumberland County Nursery Crops – twaller@njaes.rutgers.edu |
Redheaded flea beetle considerations:
Adults should be surfacing any day in the southern regions of the state. However, in two sentinel plot locations I have yet to see second generation adults as of 8/3/2021.
Contact materials aimed at managing developing larvae (especially growth regulators) may be particularly useful at this time. Contact materials or fast acting systemics should be used to target adults in the next few days to weeks. The use of long lasting systemics should also be considered to protect foliage from the next generations adults (if a third generation occurs) and again late season to guard from first generation adults in the 2022 spring season.
These GDD estimates and corresponding calendars are evolving as we continue to learn more about this pest. If you have high populations please contact Tim Waller so we can continue to adapt our recommendations in NJ. Email: twaller@njaes.rutgers.edu
SURVEY REQUESTS
WE NEED A FEW MORE FARMS!! Please answer a few questions if you would like to be included in a statewide Phytophthora in Conifer Nurseries sampling project
Contact – Timothy J. Waller – twaller@njaes.rutgers.edu for more information
North Jersey Grape Camp
North Jersey Grape Camp
Wednesday, August 4th at 4:30 PM
Location:
Alba Vineyard
269 County Road 627
Milford, NJ 08848
The meeting will include a vineyard tour, demonstration of vineyard sprayer technologies, discussion of a number of timely topics including, spotted lanternfly and nematode management, weed identification/management, fertility assessment and pesticide safety updates.
The following New Jersey Pesticide Recertification Credits will be awarded:
1-CORE 5-1A 5-10 5-PP2
Refreshments will be provided.
To register please contact Kim Crommelin, Rutgers Cooperative Extension of Hunterdon County at kfrey@co.hunterdon.nj.us or 908-788-1338.
For any questions and additional assistance contact Hunterdon County Agricultural Agent Megan Muehlbauer muehlbauer@njaes.rutgers.edu.