Eastern New York Commercial Horticulture Enrollment

Program Areas

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  • Variety Evaluation
  • Market Development
  • Pest Management
  • Cultural Practices

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  • Educational Meetings & Conferences
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  • On-Farm Research Trials

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Allium Leafminer Active in Southern Pennsylvania

Teresa Rusinek, Vegetable Specialist
Eastern New York Commercial Horticulture

April 18, 2018

A new invasive insect pest in the Northeast known as the Allium leafminer (ALM), Phytomyza gymnostoma, damages crops in the Allium genus (e.g., onion, garlic, leek, scallions, shallots, and chives) and is considered a major economic threat to Allium growers. Originally from Europe, ALM was first detected in Lancaster County, Pennsylvania in December of 2015 and in New Jersey and New York in 2016. As of fall 2017, ALM activity has been confirmed throughout eastern Pennsylvania, New Jersey, Delaware, southeastern New York as well as Tompkins and Suffolk counties.

ALM is currently active in Lancaster, PA where the first signs of adult fly emergence were detected on April 13, 2018. Based on our observations from last spring in the Hudson Valley, we expect emergence in our area in the next week or so.  ALM will continue to emerge, feed and lay eggs in alliums over about 4 weeks.  Leaf mining from larvae will begin to show up within two weeks after first adult emergence and intensify over the duration of the flight.  The larvae mine their way toward the base of the allium plant where they will pupate. 

Growers who have alliums with green tissue growing in the field or in high tunnels now in southeastern New York should consider protective measures soon, especially in Orange, Ulster, Dutchess, Columbia, Sullivan, and Schoharie counties where significant infestations were observed last year.  If you have small plantings that can be covered with row cover to exclude emerging ALM flies, now is the time to do so as long as you didn't have infested alliums (including wild onion grass) in the same space last season.   Growers with larger plantings may consider applications of insecticides if and when significant ALM activity is observed in the allium crop. There are both organic and conventional insecticides labeled for allium crops to control this type of leafminer.  Insecticide efficacy tests are currently being conducted in both New York and Pennsylvania. It is important to carefully observe your allium crops over the next few weeks.  ALM oviposition/feeding may initially be observed along field edges. Be vigilant and please call  or email either Teresa Rusinek  at 845 389-3562, tr28@cornell.edu  or Ethan Grundberg at  617 455-1893, eg572@cornell.edu  if you see evidence of ALM feeding or have any questions about management. 



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Upcoming Events

Champlain Valley Orchard Weed Management Field Trial Review

Event Offers DEC Credits

June 21, 2024 : Champlain Valley Orchard Weed Management Field Trial Review
Peru, NY

Friday June 21, 9-11:30AM

Meet at the Northern Orchard Walker block at 688 River Rd, Peru, NY

Join the ENYCHP on the morning of June 21st as we hear from Dr. Lynn Sosnoskie and Dr. Yu Jiang about their recent research looking at autonomous orchard crop management and weeding technologies.   We will then visit three of Mike's active herbicide research plots to see firsthand the level of control the trial treatments are providing during the critical weed free period. 

2.5 DEC Credits are available for this meeting in categories 22, 1A, and 10. Free to attend, but we ask that you please register ahead 

View Champlain Valley Orchard Weed Management Field Trial Review Details

Agricultural Supervisory Leadership Certificate Program - ASL 105: Employee Development and Training

June 25 - June 30, 2024 : ASL 105: Employee Development and Training

Online course is delivered through the user-friendly platform, Moodle. Materials will be available starting June 19, and live Zoom discussions will occur every Tuesday at 3 PM ET from June 25 to July 30, 2024. 

Topic areas include:

  • Setting clear expectations for farm teams
  • Designing engaging training programs
  • Providing effective performance feedback 
  • Streamlining onboarding processes for new hires
  • Cultivating a culture of continuous learning and growth
  • Personalized coaching and career planning strategies for farm personnel

View Agricultural Supervisory Leadership Certificate Program - ASL 105: Employee Development and Training Details

Virtual Orchard IPM Scout Training 2

June 25, 2024 : Virtual Orchard IPM Scout Training 2

Virtual Orchard IPM Scout Training 2

Tuesday June 25, 1:30-3:30PM   

Join us for the second live, virtual training on scouting of major insect pests of apple orchards. Anna Wallis (NYSIPM Program), Mike Basedow (CCE ENYCHP), and Janet van Zoeren (CCE LOFT), will broadcast from orchards in their region to discuss best practices for monitoring. We will review monitoring/scouting procedures for major economically significant pests. We will also share resources available for helping with identification of pests and forecasting pest activity.  

Who is this for? Farmers, farm employees, and industry members with IPM & pest management responsibilities, looking for new or refresher training.

View Virtual Orchard IPM Scout Training 2 Details

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Resources from CCE ENYCHP!


This website (https://enych.cce.cornell.edu/) contains our calendar of upcoming programs and registration links. For updated programmatic information, technical resources and links to newsletters please see our program blog site: https://blogs.cornell.edu/enychp/.
We also maintain the following online resources that you can view directly from these links:

• CCE ENYCH YouTube (program videos): https://www.youtube.com/channel/UCSk_E-ZKqSClcas49Cnvxkw

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