onion school 2024


Onion School 2024

  • Wednesday, February 28, 2024, 8:30 AM - 12:30 PM

Join CCE Orange County for our annual Onion School at the Pine Island Fire House on February 28th.

Pesticide credits information is still pending, please check back for more information! 

Event Schedule

8:30-8:40 Sign In, DEC Credit Registration

8:40-8:45 Welcome, Ethan Grundberg- CCE Eastern NY Commercial Horticulture Program

8:45-9:45 Seedcorn Maggot, Onion Maggot, and Onion Thrips Management Updates for 2024, Dr. Brian Nault- Cornell Dept. of Entomology 

  • Dr. Nault will share results from a statewide survey of seedcorn (SCM) and onion maggot (OM) populations in 2023 to shed light on the risk that each species poses to onion crops. The presentation will also update growers on effective insecticidal seed treatments for managing SCM and OM as well as sharing results from a plug tray insecticide drench experiment. Finally, Dr. Nault will review updates to onion thrips management for 2024 and beyond including research trial results from a pipeline foliar insecticide that should be registered for use by 2025 in NY.

9:45-10:15 Preparing for Optogen in NY: A Review of Bicyclopyrone Weed Control in Onions, Christy Hoepting- CCE Cornell Vegetable Program

  • A new active ingredient for managing ragweed, lambsquarters, marsh yellowcress, and other annual weeds in muckgrown onions is nearly ready for use in NY. Hoepting will review her years of research on bicyclopyrone, which weeds it effectively manages, and how to best use it in an integrated weed management program in onion production

10:15-10:30 Coffee Break

10:30-10:45 Onion Tolerance of Late Pre-Emergent Herbicide Applications, Ethan Grundberg

  • Grundberg will share preliminary results from two years of an Onion Research and Development Program funded trial to evaluate the use of late pre-emergent herbicide applications on direct seeded onions to manage Palmer amaranth.

10:45-11:15 Refining Fungicide Programs for Stemphylium Leaf Blight Management, Ethan Grundberg and Christy Hoepting 

  • Stemphylium Leaf Blight (SLB), caused by the fungal pathogen Stemphylium vesicarium, is the most serious foliar onion disease affecting muck grown onions in NY. The pathogen has developed resistance to multiple FRAC groups over the past five years leaving growers with few fungicidal tools to manage the disease. Grundberg and Hoepting will provide updates on their fungicide field trials from 2023 and review several example season-long fungicide programs for compliance with best resistance management practices.

11:15-12:00 PM Stop the Rot Project Update, Christy Hoepting 

  • This ‘Stop the Rot’ project organized 24 scientists in diverse disciplines across the U.S. to research the complete system (host, pathogen, environment) of bacterial diseases of onion. The aim was to develop practical, economically sound strategies for pathogen detection and management that will improve profitability and sustainability of onion production. Hoepting will review the major findings from the multi-year Specialty Crop Research Initiative funded project that will help improve bacterial bulb rot management.

12:00-12:15 Final Remarks, Evaluations, DEC Certificate Distribution

Sorry, no refunds, if you cannot attend, please send someone in your place.


$30 per person




Pine Island Fire Department
684 County Road 1
Pine Island, New York 10969

Last updated January 17, 2024