Tag: resistance
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Question of the Week – Pigweed
This week, the question was: What is this weed coming up in a field that was disked recently? This is a pigweed seedling, specifically Palmer amaranth (Amaranthus palmeri). Pigweeds are some of the most aggressive weeds that farmers battle. They are able to germinate and grow quickly in poor field conditions, outcompeting crops for water,…
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Basil Downy Mildew Arrives in Charleston, SC
From Clemson Plant Pathologist Tony Keinath. One of the rainstorms the week of June 5, 2023, brought basil downy mildew spores with it to Coastal REC. On Friday, June 9, all four cultivars in our demonstration were healthy and more than ready to harvest. On Monday, June 12, this is what we found. Basil downy…
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Pythium Damping-Off of Seedless and Pollenizer Watermelons
From Clemson Plant Pathologist Tony Keinath. Stand loss in transplanted spring seedless watermelons is usually not a serious issue in South Carolina, due to relatively sandy soils in the major production areas. Two pathogens that can cause post-transplanting damping-off and plant death are the fungus Fusarium and the water mold Pythium. Fusarium can kill seedlings…
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Resistance to Tebuconazole is Widespread in the Gummy Stem Blight Fungus in South Carolina
From Clemson Plant Pathologist Tony Keinath. Cucurbit growers should reduce the use of tebuconazole to manage gummy stem blight as the pathogenic fungus has become moderately resistant to this very commonly used fungicide. Seven watermelon fields were sampled in 2019 (six fields) and 2021 (one field) in Beaufort, Bamberg, Barnwell, and Hampton counties. Of 229…
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Beet Cultivars Tolerant to Cercospora Leaf Spot
From Clemson Plant Pathologist Tony Keinath. Once beets emerge from the ground, the biggest challenge South Carolina growers face is keeping the leaves free of Cercospora leaf spot. This disease is a problem wherever beets are grown for greens or bunching (roots sold with tops attached). Cercospora leaf spot does not affect the weight or…
The South Carolina Grower 