Eastern New York Commercial Horticulture Enrollment

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Managing Anthracnose Fruit Rot of Blueberries

Laura McDermott, Team Leader, Small Fruit and Vegetable Specialist
Eastern New York Commercial Horticulture

May 24, 2018

anth. blue

Anthracnose (Colletotrichum acutatum) is a serious pre- and post-harvest fruit rot in most blueberry growing regions. The flowers are infected early in the spring.  Cane, twig, and leaf lesions are more sporadic.

Symptom: The fruit rot manifests itself as sunken areas on ripe fruit with gelatinous, orange spore masses. On young canes, lesions are dark brown with fruiting bodies in concentric circles. On twigs, dark brown lesions may originate from infected buds and kill part of the twig. On the leaves, lesions look reddish brown with distinct borders. Salmon-pink spore masses may appear on infected tissues under humid conditions.

Disease cycle: The fungus overwinters in infected twigs, old fruiting spurs and live buds. In spring and summer, spores produced on infected tissues are dispersed by rain and cause new infections. Spores are released between bloom and early fruit development. Prolonged wetness (12 hours or more) and temperatures of 68-77şF (20-25şC) promote disease development. Fruit infections remain latent until the fruit starts to ripen or until after harvest.

Management: Prune out old or infected wood; create an open canopy to reduce humidity and increase spray penetration; plant resistant cultivars; limit overhead irrigation; harvest in a timely manner; cool fruit rapidly after harvest; apply effective fungicides from pink bud to harvest.  Abound, Serenade Max, Bravo, Captevate are just a few of them.  Double Nickel has some efficacy for organic growers.  If you are spraying for mummyberry you will likely take care of anthracnose.  To prevent recurrence the following year, make sure to apply petal fall spray.  For additional materials that are labelled in NYS, refer to your 2018 Cornell Berry Pest Management Guidelines.  Photos were taken by C. Heidenreich, Cornell University.  Additional information can be obtained through Michigan State University fact sheet


This article was printed in the May 24th issue of the CCE ENYCHP Berry News.  To view the full newsletter click here.



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Raspberries / Blackberries

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Upcoming Events

Berry Production Twilight Meeting

Event Offers DEC Credits

July 8, 2021
Peru, NY

Rulf's Orchard, 531 Bear Swamp Road, Peru, NY 

Many berry topics will be discussed including growing Juneberries (Amelanchier, not strawberries), using entomopathogenic nematodes to control strawberry root pests, low tunnel production in June bearing strawberries, SWD monitoring and management. 2.5 DEC pesticide recertification credits available in categories 1A, 10, 22, and 23. Contact Elisabeth Hodgdon (eh528@cornell.edu or 518-650-5323) or Laura McDermott (lgm4@cornell.edu or 518-746-2562) with questions.

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Announcements

U-Pick Farm Practices During Covid-19 Pandemic

U-Pick is a critical direct marketing approach for many of our farms and provides
customers with a unique connection to fresh produce grown close to home. In light
of what we understand about the spread of COVID-19, new management practices
will be needed to protect your farm team and your customers. This document
provides recommended practices and communication strategies for U-Pick
operations for the 2020 season.

https://rvpadmin.cce.cornell.edu/uploads/doc_864.pdf

Growers-are you running low on fall pumpkins, etc?

The Produce Auctions located around the state may have what you need.  Check out all of the opportunities here: https://harvestny.cce.cornell.edu/submission.php?id=4

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

“Understanding Fungicide Resistance and How to Avoid It” with Dr. Margaret McGrath

June 16, 2021
ENYCHP Veg News Farm and Field Updates with Teresa Rusinek
“Understanding Fungicide Resistance and How to Avoid It” with Dr. Margaret McGrath of Cornell University
In this this podcast ENYCHP vegetable specialist Teresa Rusinek interviews Dr. Margaret McGrath, of Cornell University School of Integrative Plant Science, to discuss the development of fungicide resistance in plant pathogens and steps growers can take to avoid it.
Resources:
https://www.vegetables.cornell.edu/pest-management/disease-factsheets/general-guidelines-for-managing-fungicide-resistance/
Vegetable Pathology – Long Island Horticultural Research & Extension Center (cornell.edu)
The Cucurbit Downy Mildew Forecast Homepage
https://cdm.ipmpipe.org/

listen now

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