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Late Blight Sample Collection and Submission to Cornell

Margie Lund, Extension Vegetable Specialist
Cornell Vegetable Program

Last Modified: March 4, 2020

Late Blight Sample Collection and Submission to Cornell

If late blight is detected or suspected on your farm, and you cannot get a sample to a Cornell Vegetable Program staff member in a day or two, you should submit your sample to Chris Smart's lab at Cornell. Following are instructions for reporting, collecting and mailing samples to his lab.

From usablight.org:
Samples must be reported online and a form that is generated from your submission must be included with the sample. You will receive a sample number (which should be written on the sample bag when it is sent to the lab), and this number can be used to track your sample. 

Report online and fill out a form. (If you are new to the system you must Register for Sample Submission BEFORE Reporting.)

When sending late blight samples it is better to send leaf tissue rather than fruit or tubers. If you do send fruit or tubers send them in a separate bag or shipment -- so they do not crush the leaf tissue in transit. What to send:
1. A minimum of 5 fresh turgid leaves with actively sporulating lesions. Smaller lesions are best. Collected from several locations when possible.

2. Place the foliage in an air-tight dry plastic (Ziploc) bag with a cushion of air - so the foliage doesn't get crushed. Use a small shipping box rather than an envelope. PLEASE write the sample number on the bag.

3. Send the sample immediately upon collection. If you must "hold" the sample overnight, keep it at 40 - 50 F.

4. Include the completed sample submission form (see instructions for reporting sample online) in the box with the sample.

5. Mail the sample via overnight mail to:

Cornell AgriTech
Attn: Colin Day / Chris Smart
630 West North St, Barton Laboratory
Geneva, NY 14456

E-mail: cds14@cornell.edu
Phone: 315-787-2441



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Announcements

Lorsban is Banned: What Now?

Cabbage maggot (CM) feeds on brassica seedlings by tunneling into the stem of the plant just below the soil line. Their feeding can result in unsightly and unmarketable produce in the case of root brassicas like turnips, and in stunting, reduced stand, and reduced yield in head and stem brassicas like cabbage and broccoli. Lorsban and other formulations containing the active ingredient chlorpyrifos were the first line of defense for control of cabbage maggot in several brassica crops, because 1) at ~$10 per acre, it was affordable, and 2) it was easy to apply and avoided worker exposure as a directed spray at the base of the plant.

Unfortunately, Lorsban and all of its generic products for food and feed uses were banned in New York as of July 31, 2021, and in the United States as of February 28, 2022. In the absence of Lorsban and other chlorpyrifos-containing insecticides, NY brassica growers have 6 products belonging to 4 chemical classes available to manage cabbage maggot. This article, Lorsban is Banned: How to Control Cabbage Maggot in Brassicas Now?, written by Cornell Vegetable Program Specialist Christy Hoepting and Brian Nault of Cornell AgriTech, provides our "2022 Top Picks" to use instead of Lorsban plus results of Cornell research trial results related to application method, rate, and cabbage maggot control.


Propagating Strawberry Plants Through Runners

The production of strawberry plants is challenging due to the rigorous sanitation needs that must be met, especially in field propagation settings, but also in greenhouse settings. To add to that, growers in New York may find it more difficult to obtain their preferred strawberry varieties in the coming years, as fewer nurseries are propagating strawberries. The solution: strawberry plug plants propagated from runners in a controlled environment such as a greenhouse or high tunnel.

Plug production of rarer varieties that do well in New York State will fetch a higher price than dormant bare-root plants due to the higher cost of production and lower availability in the Northeast, especially if plants are available in August. Propagating Strawberry Plants Through Runners, written by Anya Osatuke of CCE Harvest NY and Brad Bergefurd of The Ohio State University, only discusses production and marketing potential of plug plants because successful field production of bare-root strawberries is very difficult to achieve without the use of highly restricted soil fumigants. 



Cornell Commercial Vegetable Guidelines Available

The 2022 Cornell Integrated Crop and Pest Management Guidelines for Commercial Vegetable Production are now available!

Written by Cornell University specialists, this publication is designed to offer producers, seed and chemical dealers, and crop consultants practical information on growing and managing vegetable crops in New York State. Topics include general culture, nutrient management, transplant production, postharvest handling, organic production, and managing common vegetable crop pest concerns. A preview of the Vegetable Guidelines can be seen online.

Cornell Crop and Pest Management Guidelines are available as a print copy ($43.50), online-only access ($43.50), or a package combining print and online access ($61.00). Shipping charges will be added to your order. Cornell Guidelines can be obtained through many local Cornell Cooperative Extension offices (call to confirm availability), or from The Cornell Store at Cornell University or call (844) 688-7620.


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