Tag: Cucurbits
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Time to Think About Cucumber Beetles
From Tom Bilbo, Extension Entomologist As the weather warms up and our summer vegetable crops get going, it’s time to be on the lookout for cucumber beetles in our various cucurbit crops. There are three species that we see in South Carolina: banded, spotted, and striped cucumber beetles, with the latter two being more problematic…
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Field Scouting and Identification of Diseases on Cucurbits in South Carolina
From Clemson Plant Pathologist Tony Keinath For anyone who missed the Preplant Cucurbit Meeting on Feb. 7, 2025, at the Edisto Research and Education Center, here is a recap of the main points on scouting fields for cucurbit diseases. Table 1 shows which diseases are most likely to show up on different crops. Use this…
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The Pesky Caterpillar Pests of Cucurbit Crops: Part 2
From Extension Vegetable Entomologist Tom Bilbo Last week, we covered identification and management strategies for the squash vine borer, the first of three common cucurbit caterpillar pests. This week, we will discuss the other two. Melonworm (Diaphania hyalinata) and Pickleworm (D. nitidalis) These closely related insects are tropical species that are only known to overwinter…
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The Pesky Caterpillar Pests of Cucurbit Crops: Part 1
From Extension Vegetable Entomologist Tom Bilbo There are three common caterpillar pests that plague growers of cucurbits in South Carolina and elsewhere throughout the Southeast: the squash vine borer (SVB), the pickleworm, and the melonworm. All three are specialist herbivores of cucurbits, which means they (the caterpillar stage) only feed on cucurbits and are specially…
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Cucumber Cultivar Response to Downy Mildew
From Clemson Plant Pathologist Tony Keinath This blog is an update on the preliminary cucumber cultivar reactions to downy mildew posted on June 16, 2023. Use the info in this blog to choose cultivars. Clearly, a few cultivars had temporarily “escaped” infection, although I don’t know how that was possible. In addition, the resistances originally…
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Fungicide Sensitivity of Cucurbit Powdery Mildew in Charleston, SC
From Clemson Plant Pathologist Tony Keinath A fungicide sensitivity bioassay was done between June 1 and June 10, 2023, to find out which fungicides can be used against the current outbreak of powdery mildew on squash, watermelon, and other cucurbits. Methods: Yellow summer squash plants ‘Early Prolific’ with three true leaves were treated with one…
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Urgent: Powdery Mildew Found on Watermelon in Charleston, SC
From Clemson Plant Pathologist Tony Keinath. Powdery mildew was found on three cultivars of seedless watermelon at the Clemson Coastal REC on May 23, 2023. All watermelon crops in South Carolina should be 1) scouted for powdewry mildew and 2) if found, sprayed to prevent powdery mildew from reducing yields by up to 40%. When…
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Cucurbit Downy Mildew Found in SC
Prepared by Rob Last, Justin Ballew, and Tony Keinath. Cucurbit downy mildew was identified in South Carolina on 5/12/23. The identification came from butternut squash grown in a sentinel plot at the Coastal REC in Charleston. The same strain that affects butternut squash also affects watermelon and summer squash. Now that downy mildew has been…
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Question of the Week – Squash Beetle Trenching
This week, the question was: Why is a portion of this squash leaf discolored? The light-colored tissue we see here is the result of squash beetle behavior known as “trenching.” Trenching cuts off (at least temporarily) the translocation of cucurbitacin defense compounds, to preserve the palatability and quality of the squash foliage feeding site. The beetles…
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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…
The South Carolina Grower 