Eastern New York Commercial Horticulture Enrollment

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Allium Leafminer Spring Flight Update

Ethan Grundberg, Vegetable Specialist
Eastern New York Commercial Horticulture

May 31, 2018

The spring flight of the new invasive insect pest, the allium leafminer, began in late April with the first confirmed activity in the Red Hook area. Adults have gradually emerged from pupae in the soil and in cull piles for the past four weeks and have been feeding and laying eggs on allium leaves during that time. The diagnostic sign of this adult feeding and egg-laying is a vertical line of dots, typically found near the tip of host crop leaves. These oviposition scars are sometimes accompanied by faint, mostly vertical lines that run down the leaf blade toward the soil. These "mines" are caused by allium leafminer (ALM) maggots feeding on the interior leaf tissue.

We are still actively studying this new pest to better guide allium growers in the region on best management practices. Here are some important updates based on that work:

1.  Not all oviposition scars are egg-laying sites: Adult females use their ovipositor (egg-laying organ) to create the small dots in the leaf tissue. Adults feed on the plant exudates that are released through those physical wounds. We are studying leaf samples from multiple allium species during the adult flight period to try to determine what percentage of those oviposition locations are, on average, active egg-laying sites versus feeding sites. What is certain at this point is that NOT ALL OVIPOSITION SCARS ARE ACTIVE EGG-LAYING SITES. That means that even if you find 20 oviposition dots on a leaf, there are likely far fewer eggs in the leaf tissue. Fewer eggs mean fewer maggots, which means less potential for significant damage to crops.

2.  I still found several adult flies in the field on Monday, May 21st. Though some adults may still be active, I am confident that we are past the period of peak flight and that there is little risk of additional egg-laying on crops at this time. THIS MEANS THAT GROWERS USING ROW COVER OR INSECT NETTING TO EXCLUDE ADULTS CAN REMOVE THEM AT THIS POINT WITH LITTLE RISK OF ADDITIONAL ALM DAMAGE. Maggots will continue to hatch from recently laid eggs and further damage crops for the next couple of weeks.

3.  We are still collaborating with the Cornell entomologist Dr. Brian Nault on insecticide efficacy evaluations of both conventional and OMRI products. We will update growers prior to the beginning of thefall flight of ALM (anticipated in mid-to-late September) with findings from those trials. If extensive maggot mining is observed, Radiant SC (spinetoram, IRAC group 5) mixed with a penetrating surfactant (such as LI 700) can be used with a 1-day Pre-Harvest Interval (PHI) on most allium crops for dipteran leafminer control. Since the maggots are inside the leaf tissue, only active ingredients with translaminar (penetrates locally through the leaf tissue where the product makes contact) or systemic (is absorbed through the leaf tissue and moved upward throughout the plant vascular system) activity will reduce damage. Contact insecticides, such as pyrethroids (IRAC Group 3A) will NOT be effective at this point.

4. We have confirmed ALM activity as far north as Schoharie and Grafton and as far east as Berkshire County, Massachusetts. ALLIUM GROWERS AS FAR NORTH AS GLENS FALLS SHOULD BE PREPARED TO PROTECT FALL ALLIUMS FROM ALM and be on the lookout for alerts from the ENYCHP team once the fall emergence in confirmed.

 If you suspect ALM activity on your farm and would like further recommendations for management, feel free to reach out to me directly at 617-455-1893 or Teresa Rusinek at tr28@cornell.edu.

 

almAdult allium leafminer fly with characteristic vertical line of oviposition feeding and egg-laying scars (Photo E Grundberg)



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Upcoming Events

June Produce Field Meeting

Event Offers DEC Credits

June 5, 2024 : June Produce Field Meeting
Fort Plain, NY

Come join us for a discussion on greenhouse production, IPM techniques in the greenhouse, and a discussion of IPM strategies for tomatoes, cole crops and cucurbits. 

Meeting is free and open to the public.

2 DEC credits in categories 1A and 23 are available. 

View June Produce Field Meeting Details

Weed Management in Perennial Fruit Crops - Field Workshop

Event Offers DEC Credits

June 20, 2024 : Weed Management in Perennial Fruit Crops - Field Workshop
Tivoli, NY

Join us on the morning of June 20th as we hear from Cornell University weed management specialists Dr. Lynn Sosnoskie and Dr. Yu Jiang, who will discuss their recent research on autonomous orchard weeding systems.  

We will also hear from Mike Basedow of CCE ENYCH and learn about the ongoing results of herbicide research trials he is conducting.  Bryan Brown of NYS IPM will discuss pre-plant preparations and mulches that could be useful for controlling weeds without herbicides.   

Identifying the differences between weed species and key differences between annuals and perennials that factor into management will also be covered.     

This workshop is FREE to attend, but we ask that you please register ahead 

View Weed Management in Perennial Fruit Crops - Field Workshop Details

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

Announcements

2023 Spotted Wing Drosophila Monitoring/Management

All berry farmers are watching for monitoring reports that indicate Spotted Wing Drosophila (SWD) adults are in their region. Mid-season berry crops should be sprayed as soon as berries begin to ripen unless you've elected to use insect exclusion netting.

- For general information about SWD, and to enroll for free monitoring reports, visit the Cornell SWD blog https://blogs.cornell.edu/swd1/.
- Click here for the 2023 Quick Guide for Pesticide Management. 
- For some great instructional videos and fact sheets on insect exclusion netting, visit the University of Vermont's Ag Engineering blog.


Resources from CCE ENYCHP!

We are developing new ways to connect with the CCE ENYCHP team this year! We have a Youtube page located at this link. Check out videos on Table Grape Production, Pest Updates and the 20 Minute Ag Manager - in 4 Minutes series

We have a Facebook Page here as well as an Instagram page. We keep these places updated with current projects, events, and other interesting articles and deadlines.

There are also text alerts available. Fruit and vegetable farmers in 17 Eastern NY counties can now receive real time alerts on high risk disease and pest outbreaks texted directly to their cell phone. The Eastern NY Commercial Horticulture program, which is supported by local Cornell Cooperative Extension associations, will now offer text alerts to those that enroll in our program in 2019. 

The text alerts will be reserved for important crop alerts that could impact management decisions immediately. For instance, if there were an outbreak of Late Blight in the area, this would be transmitted to vegetable growers.

Farmers can choose the crop for which they wish to receive updates. Additionally they can request that Ag Business Alerts be sent to them. These alerts might include due dates for crop insurance deadlines, market opportunities etc.

If you have questions, please contact enychp@cornell.edu


Podcasts

Winter Greens Grower Interviews in Northern New York

October 22, 2022
In this episode, vegetable specialist Elisabeth Hodgdon interviews Lindsey Pashow, ag business development and marketing specialist with the Cornell Cooperative Extension Harvest New York team. They discuss findings from a series of interviews with winter greens producers in northern New York. Lindsey shares production and marketing challenges associated with growing winter greens in this cold and rural part of the state, success stories and advice from growers, and tips for those interested in adding new crop enterprises to their operation.

Funding for this project was provided by the Northern New York Agricultural Development Program. The episode was edited by Miles Todaro of the ENYCHP team.

Resources:
• Crop enterprise budget resources available from Penn State Extension (field and tunnel vegetables: https://extension.psu.edu/small-scale-field-grown-and-season-extension-budgets), UMass Extension (winter spinach budgets: https://ag.umass.edu/vegetable/outreach-project/improving-production-yield-of-winter-greens-in-northeast and field vegetables: https://ag.umass.edu/vegetable/fact-sheets/crop-production-budgets), and Cornell Cooperative Extension (high tunnel vegetables: https://blogs.cornell.edu/hightunnels/economics/sample-budgets-spreadsheets/). Use these budgets as templates when developing your own crop enterprise budget.
• The Organic Farmer’s Business Handbook, by Richard Wiswall
• The Winter Harvest Handbook, by Eliot Coleman

For questions about the winter greens project discussed in this podcast, reach out to Lindsey Pashow (lep67@cornell.edu) or Elisabeth Hodgdon(eh528@cornell.edu).

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