North Carolina Pest News – June 21, 2013 (Fruit and Vegetables)

— Written By Amie Newsome and last updated by Nikki Davis

NORTH CAROLINA COOPERATIVE EXTENSION SERVICE
North Carolina State University * College of Agriculture & Life Sciences
Dept. of Entomology * Box 7613 * Raleigh, NC 27695 * Ph: (919) 513-8189

 NORTH CAROLINA PEST NEWS
Stephen J. Toth, Jr., editor
Volume 28, Number 11, June 21, 2013

CAUTION: The information and recommendations in this newsletter are applicable to North Carolina and may not apply in other areas.

FRUIT AND VEGETABLES

From: Lina Quesada-Ocampo, Extension Plant Pathologist

Potato Late Blight Alert

Late blight was found on tomatoes on the Eastern shore of Virginia on June 20, 2013. Also, the Plant Disease and Insect Clinic (http://www.cals.ncsu.edu/plantpath/extension/clinic/) at North Carolina State University also received pictures of a potato sample from Watauga County, North Carolina that appears to be infected with late blight. However, this is an unconfirmed report and we are waiting for a physical sample to verify. Potato and tomato are susceptible to this disease, and can be significantly defoliated within days if environmental conditions favor the pathogen.

Active scouting and immediate action to protect potato crops in North Carolina from late blight is recommended, since we have been experiencing wet and cool weather that is conducive to disease. For more information about potato late blight and how to control it see factsheets in English and Spanish (http://projects.cals.ncsu.edu/veggiepathology/disease_factsheets) produced by Dr. Lina Quesada-Ocampo (http://plantpath.cals.ncsu.edu/faculty/lina-m-quesada-ocampo) at Department of Plant Pathology (http://plantpath.cals.ncsu.edu/). Control recommendations are also available in the USAblight website (http://www.usablight.org/), where you can also register to receive text and/or e-mail alerts when new disease outbreaks are reported.

For tomato late blight information and control recommendations, please refer to the alert released by Dr. Kelly Ivors (http://plantpath.cals.ncsu.edu/faculty/kelly-l-ivors) and the related factsheet for tomato late blight (https://www.ces.ncsu.edu/wp-content/uploads/2013/06/Tomato_late_blight_ki.pdf).

If you think you have late blight in your potatoes please contact your local Extension agent (http://www.ces.ncsu.edu/local-county-center/) and send photos and/or physical samples to the Plant Disease and Insect Clinic. If late blight is confirmed in your samples by an expert, please send a report at the USAblight website to alert other growers.

Control strategies are provided in the factsheets for commercial growers. Homeowners can use gardening fungicides that contain chlorothalonil as an active ingredient. Organic growers can use copper-based products to slow down disease progression.

Follow us on Twitter and Facebook for more veggie disease alerts (https://twitter.com/QuesadaLabNCSU and https://www.facebook.com/QuesadaLabNCSU).

From: Kelly Ivors, Extension Plant Pathologist

Tomato Late Blight Alert

Late blight of tomato, caused by Phytophthora infestans, is knocking on the doors of our state border. On Thursday, June 20, 2013, the clinic received pictures from an Extension agent of what appears to be classic symptoms of late blight on potato from Watauga County, North Carolina. The clinic has yet to receive a physical sample for confirmation. Given the fact that this disease has been confirmed in Maryland, Virginia, West Virginia, Tennessee and possibly Kentucky, in addition to the recent wet and cool weather that is conducive for the pathogen’s growth and spread, we are concerned the disease will be soon arriving to North Carolina, if it’s not already here.

Without proper preventative measures, late blight can completely defoliate and destroy a crop within one to two weeks. The disease can be severe on tomatoes grown in the mountains of North Carolina, as well as in late plantings in the piedmont.

For more information about tomato late blight and how to control it see a tomato late blight factsheet produced by Dr. Kelly Ivors at the Department of Plant Pathology. Control recommendations are also available in the USAblight website, where you can also register to receive text and/or email alerts when new disease outbreaks are reported.

For potato late blight information and control recomendations please refer to the alert (http://plantpathology.ces.ncsu.edu/2013/06/pest-news-potato-late-blight-alert/) released by Dr. Lina Quesada-Ocampo and the related factsheets in English and Spanish.

Written By

Photo of Amie NewsomeAmie NewsomeExtension Agent, Agriculture - Commercial Horticulture (919) 989-5380 (Office) amie_newsome@ncsu.eduJohnston County, North Carolina
Updated on Mar 25, 2014
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