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Orondis: a new fungicide for downy mildew, late blight and Phytophthora...
Orondis (Syngenta Crop Protection) is a new fungicide effective against a range of oomycete pathogens in vegetables, potatoes and other crops that will be available in 2016. There has been a lot of...
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Annual Muck Crops School, Willard, OH
The Annual Muck Crops School has been held in Willard, Ohio for the past 70 years. During this year’s school on January 8, my vegetable disease management update focused in part on diseases caused by...
View ArticleManaging Vine Crop Diseases – Mid-Ohio Growers Meeting, Dalton OH
Today I am posting my presentation “Preventing and Slashing Vine Crop Diseases” delivered to about 250 vegetable growers at the Mid-Ohio Growers Meeting held today and tomorrow at the Buckeye Event...
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It Takes a Village…
Vegetable planting season outdoors has begun in the southern parts of Ohio and is about to start in the northern tier counties, so it is time to think about disease management programs. Last year was a...
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White Mold/Timber Rot Management in Tomato High Tunnels
According to a 2015 Report on Horticulture by the National Agricultural Statistics Service (NASS), production of vegetables in “protected culture” nationwide increased 71% between 2009 and 2014....
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Watch for Dickeya – a New Potato Disease
Last year a “new” potato disease was found in several states in the Northeast and a few in the Midwest. The bacterial disease looks at first like blackleg, caused by a different bacterium, but is much...
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Downy Mildew Spotted in OH and Ontario
Downy mildew reported in Kent County, Ontario on July 5 and West Salem, OH on July 8, 2016. Downy mildew was confirmed this afternoon in cucumbers in West Salem (Wayne County), OH. This follows...
View ArticleBlackleg Caused by Dickeya dianthicola confirmed in OH
A potato sample with blackleg symptoms received late last week in the OSU Vegetable Pathology lab was confirmed to be caused by Dickeya dianthicola. This is the first report of the more aggressive...
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Cucurbit Downy Mildew Update
Counties in which downy mildew has been reported on cucurbits. Most recent outbreaks are in red. Map from cdmipmpipe.org. So far downy mildew has been confirmed on cucumbers in Wayne, Huron, Sandusky,...
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Tospoviruses in Tomatoes and Peppers
Thanks to Dr. Celeste Welty, OSU Department of Entomology, for contributing to this post. We have seen an unusually high number of tomato and pepper samples with Tomato spotted wilt virus and related...
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Downy Mildew Now on Pumpkins in Southern Ohio
We have confirmed downy mildew on pumpkins for the first time in Ohio this year, in Pike County. Downy mildew is widespread in northern Ohio on cucumbers and melons, but has not been reported on...
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Downy Mildew Now Widespread in Ohio Cucurbits
Our first report in 2016 of downy mildew on pumpkins in Ohio came from Pike County, in the southern part of the state. Late last week we found downy mildew on pumpkins and squash in our sentinel plot...
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Alternaria Leaf Spot of Cauliflower
We have received several samples of cauliflower in the last two weeks with black spots on the heads. These spots ranged from small pinpoint dots to larger circular spots up to several mm in diameter...
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OSU Vegetable Disease Management Research Report for 2016 Available
Our 2016 final report on field research trials conducted in 2016 can be accessed here:plantpathologyseriesno-146. The hot dry weather for most of the summer of 2016, followed by a wet, fairly warm...
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Basil Growers – Be on the Watch for Downy Mildew
Basil plants in a nursery in Ohio were confirmed to have downy mildew by Nancy Taylor of OSU’s Plant and Pest Diagnostic Clinic (Fig. 1). The pathogen that causes basil downy mildew, Peronospora...
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What Are the Most Worrisome Diseases in Your Vegetable Crops?
Many specialty crop growers are aware of the USDA IR-4 Minor Use Program, which works to promote registration of products for pest, disease and weed management in “minor use” crops – including...
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Managing Phytophthora Blight in Peppers
Phytophthora blight has become a very serious problem in peppers and cucurbits, particularly in areas with concentrated vegetable production. The pathogen is a water mold that thrives under conditions...
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High Tunnel/Greenhouse Tomato Diseases Starting to Appear
While open-field tomatoes are just getting started in parts of this region, high tunnel and greenhouse tomatoes have been in the soil for quite a while now to get that early start on the season. So we...
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This Week in the OSU Vegetable Disease Diagnostics Lab
It has been a busy week in the diagnostics lab – we continue to receive high tunnel and greenhouse tomatoes, but open-field vegetables and herbs are now making an appearance. These are some of the...
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Watch for Late Blight in Tomatoes and Potatoes
Our colleagues in Ontario reported late blight today on tomatoes in Chatham-Kent. That means that inoculum of the late blight pathogen is active in the region, and given the rainy/overcast, cool...
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