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Blossom End Rot in Peppers
Blossom end rot of bell pepper The hot, dry weather of the last few weeks has been stressful for peppers, resulting in the appearance of blossom end rot, especially in early fruit sets. Blossom end...
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Cucurbit Downy Mildew is Spreading in Ohio Despite Hot Weather
Micrograph of a tape mount of spores and sporangiophores of the cucurbit downy mildew pathogen from cucumber leaves. Photo by Francesca Rotondo. Downy mildew continues to spread in Ohio cucumbers...
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Cucumber Downy Mildew Confirmed in Sandusky County in Ohio
Downy mildew was confirmed today on cucumbers in our sentinel plot on the OSU North Central Agricultural Research Station in Fremont and a home garden in Clyde, both in Sandusky County. This follows...
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Bacterial Canker Showing Up in Tomatoes this Summer
Bacterial canker in fresh-market tomatoes. Bacterial canker is a systemic disease of tomatoes caused by the bacterium Clavibacter michiganensis subsp. michiganensis. It can occur in fresh market and...
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Plectosporium Blight of Pumpkins, Squash
White, diamond-shaped lesions of Plectosporium blight on pumpkin vine (photo by Francesca Rotondo) We’ve had several reports this week of Plectosporium blight appearing in pumpkins in Ohio. Sometimes...
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Cercospora “Frogeye” Leaf Spot of Peppers
Frogeye lesions on pepper leaves (photo by M. Netz) Frogeye leaf spot, caused by the fungus Cercospora capsici, has distinctive symptoms on leaves, stems and peduncles of pepper and eggplant. Lesions...
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Notes on Downy Mildews – Cucurbits and Basil
Downy mildew on cantaloupe Downy mildew has been reported in several Northern Ohio counties: on cucumbers in Huron, Medina, Sandusky, Seneca, and Wayne counties, and also on cantaloupe in Sandusky...
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Cucurbit Downy Mildew Update
Severe damage to cucumbers by downy mildew. Photo by M. Mechling. The OSU Vegetable Pathology lab confirmed downy mildew in cucumbers from Jefferson and Perry counties in eastern and central Ohio...
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Cucurbit Downy Mildew Spreads to Squash, Pumpkins and Watermelons in Ohio
Downy mildew lesions on pumpkin. Photo by Francesca Rotondo. We are coming to the end of the cucurbit growing season, and until this week had only seen downy mildew on cucumbers and a few cantaloupes...
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Managing Phytophthora Blight and Pythium Root Rot in Peppers – Fungicide Update
Ohio pepper growers are taking advantage of some dry, warm days to set transplants in the field. If Pythium root rot or Phytophthora blight has been a problem in these fields in the past, or high...
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Staking Tomatoes and Peppers – Can Stakes be Reused?
We often get questions from growers about reusing wooden or other stakes for tomato and pepper production, particularly if diseases like Phytophthora blight, Pythium root rot or bacterial canker were...
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Cucumber Downy Mildew Confirmed in Ontario – Cucumber and Melon Growers in...
Downy mildew was reported on cucumbers in Ontario today. This is the first report for 2021 of cucurbit downy mildew in the Great Lakes region. There have been no reports of cucurbit downy mildew in...
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Cucurbit Downy Mildew Fungicide Efficacy in Ohio 2018-2020 and...
Now that we know cucumber downy mildew has appeared in the Great Lakes Region (Ontario report – see my post on 6/17/2021), cucumber and melon growers should prepare for fungicide applications. There...
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This is a Year for Bacterial Diseases in Ohio Open Field Vegetables
Numerous intense rainstorms that have moved across Ohio during the 2021 growing season so far have created conditions for the establishment and spread of bacterial diseases. Unseasonably cool weather...
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Cucurbit Powdery Mildew Management Recommendations
Powdery mildew colonies on upper leaf surface. Powdery mildew normally appears on pumpkins and other cucurbits in Ohio in early July. Signs of infection are small circular powdery growths on either...
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Managing Mildews in Home Garden Cucurbits
Downy mildew of cucumber. Downy mildew and powdery mildew are very different diseases of cucurbits but they have in common that they are obligate pathogens that require a living plant for survival and...
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Addendum: More Powdery Mildew Fungicides for Cucurbits
Thanks to Jim Jasinski for providing more info on fungicides for powdery mildew that he has tested on cucurbits. The following table is amended from my post on July 6, 2021 to include three additional...
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Cucumber Downy Mildew Confirmed in Northern Ohio
Cucurbit downy mildew occurrences in the eastern US. https://cdm.ipmpipe.org. Downy mildew was reported on pickling cucumbers in Seneca County today. The field was heavily damaged, with about 90% of...
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Basil Downy Mildew Spotted in Wayne County, Ohio
Basil plants with severe downy mildew symptoms in a big box store garden center in Wooster, OH. Photo by F. Rotondo. This is shaping up to be a summer of downy mildews in Ohio. Rainstorms, high...
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