Archives for March 2025

March 8, 2025

Black Knot Fungus of Prunus: A Common Landscape Disease

Overview:

Black knot is a cankering fungus disease that infects many trees and shrubs within the genus Prunus. It is caused by the native North American fungal pathogen Apiosporina morbosa. Although black knot fungal galls have been found in a couple of dozen Prunus species, not all species are equally susceptible, and it can be most destructive to certain varieties of cherries and plums (Photo 1).

The following species can be highly susceptible to infections: Japanese plums (Prunus salicina), European and American plums (Prunus domestica & Prunus americana), Sweet cherry (Prunus avium), Mahaleb cherry (Prunus mahaleb), and cultivated species of chokecherries.

This blog reviews the symptoms and signs of Black Knot Disease. It’s management by pruning and fungicide treatments is discussed. Finally, a handful of resistant plum varieties is provided.

Photo 1: This Japanese Plum species is highly susceptible to Black Knot Disease.

Photo 1: This Japanese Plum species is highly susceptible to Black Knot Disease. (Photo Credit: Steven K. Rettke, Rutgers Coop. Ext.)

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Filed Under: Landscape, Nursery, & Turf, Nursery, Plant Diagnostic Lab
March 4, 2025

Approaching 2025 Boxwood Blight Season

March weather is always unpredictable, however, if we have sustained periods of increased temperatures and spring rains, boxwood blight (BWB) will become an issue quickly.

New – [pictorial tri-fold] Common Boxwood Pests and Diseases (click-here). This includes Box Tree Moth images. Print the PDF out double-sided, then fold. We are working to have a better resolution print of this material very soon.

If you suspect Boxwood Blight and would like to have this verified – please contact the Rutgers Plant Diagnostic Laboratory (click here) for sample submission instructions

Boxwood Blight Risk Assessment as of 3/4/2025
Region Location CODE 3-March 4-March 5-March 6-March 7-March 8-March
Southern Upper Deerfield NJ50 Very Low  Very Low  Low Minor Risk Very Low  Very Low 
Central Howell / Freehold NJ10 Very Low  Very Low  Low Minor Risk Very Low  Very Low 
Northern High Point NJ59 Very Low  Very Low  Very Low  Minor Risk Very Low  Very Low 
M T W TH F S
 Please check YOUR LOCAL risk (click here)

There is a minor potential for boxwood blight infections this Wednesday & Thursday, throughout ALL of NJ. Incoming rains, coupled with warmer temperatures may initiate boxwood blight infections this week.

  • It is time to begin protective fungicide applications in boxwoods throughout the state if you have not already done so. 

  • If BWB is important to your business – Use the USPEST – PUSH Alerts – (click here) – to setup weekly email alerts. Create an account, watch the tutorial, and then set up your subscriptions. You select which locations (as many as you like), days you want to receive emails, and what you would like to receive alerts about (BWB and a variety of other pests and diseases). Rutgers is not directly affiliated, however this is an incredible tool. 

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Filed Under: Landscape, Nursery, & Turf, Nursery, Turf Tagged With: , , , , , , , , , ,
March 3, 2025

SAVE THE DATE: Farm Viability Extension Specialist Candidate Seminar

Manlin Cui, candidate for Extension Specialist in Farm Viability, will deliver her stakeholder seminar “Bridging Research and Practice: Enterprise Budgets, Sustainable Innovations, and Consumer Insights” on Monday, March 10, 2025 from 7:00 to 8:00 pm. 

The seminar will take place at the Middlesex County E.A.R.T.H. Center located at 42 Riva Ave, North Brunswick Township, NJ 08902. We welcome you to attend in person, but a Zoom option is available. Email kbrown@njaes.rutgers.edu for Zoom attendance troubleshooting. [Read more…]

Filed Under: Commercial Ag Updates, Field, Forage & Livestock, Fruit, Landscape, Nursery, & Turf, Vegetable Crops Tagged With: ,
March 2, 2025

USDA Extends Deadline For The 2024 Census of Horticultural Specialties

Trenton, NJ – The U.S. Department of Agriculture’s National Agricultural Statistics Service (NASS) will continue to collect the 2024 Census of Horticultural Specialties through April 18, 2025. Conducted just once every five years, the Census of Horticultural Specialties is the only source of detailed production and sales data for U.S. floriculture, nursery, and specialty crop industries, including greenhouse food crops.

Growers are encouraged to complete their survey either online at agcounts.usda.gov or by mail as soon as possible. The online questionnaire is user-friendly, accessible on most electronic devices, and saves producers time by calculating totals and automatically skipping questions that do not apply to their operations.

NASS enumerators will also continue gathering data and ask respondents to complete and return their survey form as soon as possible. If those who have received the form are no longer involved in horticultural operations, or need assistance completing the questionnaire, they can call toll-free, 888-424-7828 so their record can be updated.

Producers who receive the 2024 Census of Horticultural Specialties are required to respond by federal law (Title 7 USC 2204(g) Public Law 105-113), as it is part of the Census of Agriculture program. That same law also requires NASS to keep all individual information confidential.

“This is a great opportunity to show the importance of New Jersey food grown under cover,” stated Bruce Eklund, USDA/NASS NJ State Statistician. “Our end-of-the-year vegetable survey, for example, only shows crops grown in the open.” Growers should have received the survey via mail and or a specific survey code to complete the survey online. If you can’t locate the survey or your code, please contact Bruce at 503.308.0404 or by email at bruce.eklund@usda.gov.

The 2024 Census of Horticultural Specialties data is scheduled to be available on December 16, 2025, at nass.usda.gov/AgCensus and in the Quick Stats database at quickstats.nass.usda.gov. For more about the 2024 Census of Horticultural Specialties, please visit nass.usda.gov/go/hort.

NASS is the federal statistical agency responsible for producing official data about U.S. agriculture and is committed to providing timely, accurate and useful statistics in service to U.S. agriculture. USDA is an equal opportunity provider, employer, and lender.

Filed Under: Blueberry, Commercial Ag Updates, Fruit, Organic Production, Tree Fruit, Vegetable Crops, Wine Grape Tagged With: , ,
March 2, 2025

Stop the Bleed Training in Burlington County: Registration Open

Rutgers Cooperative Extension, in partnership with the Rutgers New Jersey Medical School, will host a Stop the Bleed training on Tuesday, April 8, 2025. The training will be held from 10:00 am – 12:00 pm at the Rutgers EcoComplex located at 1200 Florence Columbus Rd, Fieldsboro, NJ 08505.

Don’t miss this opportunity to learn the life-saving skills of pressure application, wound packing, and use of tourniquets. Attendees of this free training will also receive a complementary bleeding control kit.

Space is limited and pre-registration is required. Please complete our pre-registration form by Monday, April 1.

Questions? Email Kate Brown, RCE-Somerset County Ag Agent, at kbrown@njaes.rutgers.edu or call 908-526-6293.

Filed Under: Commercial Ag Updates, Field, Forage & Livestock, Fruit, Landscape, Nursery, & Turf, Vegetable Crops Tagged With: