Month: June 2022
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Question of the Week – ICW Crysalis
This week, the question was: What is stuck to this collard leaf? This is the chrysalis of an imported cabbageworm (ICW). The ICW is an unusual brassica feeding caterpillar in that the adult stage is a butterfly, rather than a moth. Because of this, it pupates in a chrysalis, instead of a cocoon. The adult,…
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Field Testing for Bacterial Wilt
Bacterial wilt and Southern blight have been showing up in SC over the last couple weeks. While both diseases cause indistinguishable wilting in the infected plant, it is important to determine which disease is present in order to appropriately manage it. The test shown below is a quick field test that will help distinguish between…
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Managing Phytophthora Blight on Pepper
From Clemson Plant Pathologist Tony Keinath and Extension Agent Andy Rollins. After 3.28 inches of rain in the Upstate from May 23 to 26, symptoms of Phytophthora blight showed up in one or more fields of pepper and tomato after June 1. The heavy downpour and the volume of rain saturated the soil, providing the…
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Weekly Field Update – 6/6/22
Clemson Plant Pathologist Tony Keinath has been busy updating Extension Disease Publications on Clemson’s Land-Grant Press. Be sure to refer to the following resources as you think about your disease management programs: Gummy Stem Blight on Watermelon and Muskmelon, Watermelon Fungicide Guide, Cucurbit Downy Mildew Management, Powdery Mildew on Watermelon, and Controlling Bacterial Spot on…
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Downy Mildew Spreads to Charleston, SC
From Clemson Plant Pathologist Tony Keinath and Extension Agent Zack Snipes. Downy mildew was found on non-sprayed “sentinel” cucumbers at Coastal REC, Charleston, SC, on June 1. Two susceptible slicing cultivars (Silver Slicer and Poinsette) had 5% leaf area diseased, while the resistant cultivars Citadel pickling and DMR-NY401 slicing and the moderately resistant Bristol slicing…
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Question of the Week – Squash Vine Borer
This week, the question was: What is this critter resting on a zucchini flower bud? This is the adult form of the squash vine borer. The female moth lays eggs on the leaves and stems of squash and zucchini plants. A tiny caterpillar hatches from the egg and bores into the stems to feed. We…
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Fusarium Wilt Symptoms in Watermelon at Fruit Set Stage
From Clemson Plant Pathologist Tony Keinath and Extension Agent Rob Last. Watermelon growers may find new plants with symptoms of Fusarium wilt as the plants start to set fruit or as fruit sizes up. In the infested field at Coastal REC, 3-5% of the plants previously rated as healthy showed symptoms in the past 2…
The South Carolina Grower 