Rutgers University | New Jersey Agricultural Experiment Station | Pesticide User Responsibility

June 14, 2023 , and

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.

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May 14, 2023 , and

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.

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October 8, 2014

Odds and Ends

Springtime 2014 seemed like it would go on forever. Temperatures remained cool for an extended period and we had plenty of moisture, which are the conditions that always result in shade tree leaf diseases. Here are a few we saw…

Ash rust, caused by Puccinia sparginoides. Photo: Sabrina Tirpak, Rutgers PDL

Ash rust, caused by Puccinia sparganioides. Photo: Sabrina Tirpak, Rutgers PDL

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July 1, 2013

The Last Word in Leaf Spots

Oh no! Not more leaf spot posts! This is the last one for now, I promise. First thing first, we had a nice sample from a perennial ryegrass baseball field that was submitted for dollar spot diagnosis, which it had, but it was also covered with leaf lesions caused by the fungus Bipolaris sorokiniana. Sabrina thought it would be nice to share a photo with you.

Leaf spots caused by Bipolaris sorokiniana on perennial ryegrass leaves. Photo: Sabrina Tirpak, Rutgers PDL

Leaf spots caused by Bipolaris sorokiniana on perennial ryegrass leaves. Photo: Sabrina Tirpak, Rutgers PDL

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June 21, 2013

Red Leaf Spot… or not?

Red leaf spot of creeping bentgrass is a poorly understood leaf spot disease in turfgrass. Almost all golf course superintendents think they have it at one point or another, but nobody ever really does.

Red leaf spot on creeping bentgrass. Photo: Richard Buckley, Rutgers PDL

Red leaf spot on creeping bentgrass putting green. Photo: Richard Buckley, Rutgers PDL

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May 21, 2013

Bizzaro World

The crew of the Plant Diagnostic Laboratory are always on the hunt for new and exciting examples of plant damage. Last week, out walking her dog, Sabrina Tirpak our Principle Technician and photographer happened upon a red maple with these amazing red leaf spots.

Dramatic leaf spots caused by the ocellate maple gall midge, Acericecis ocellaris. Photo: Sabrina Tirpak, Rutgers PDL

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