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SC Fruit and Vegetable Field Report – July 20, 2021

Midlands Region

Justin Ballew reports, “Not much has changed in the midlands over the last week. We’ve received some scattered rain, and it has been warm and humid. As a result, we are still seeing disease issues. We’re still picking tomatoes, squash, zucchini, cucumbers, sweet corn, and a few greens. We’re at an in-between stage in several fields where the spring crops have finished, and folks are preparing to plant fall crops. Some have already started fall cucurbit plantings. For anyone planting strawberries this fall, if you are still deciding which varieties to try, see NCSU’s 2020/2021 variety comparison data (pages 9 and 10).

Disease development like this anthracnose of watermelon is still being favored by the weather. Justin Ballew, ©2021, Clemson Extension

Disease development like this anthracnose of watermelon is still being favored by the weather.
Justin Ballew, ©2021, Clemson Extension

Pee Dee Region

Bruce McLean reports, “Vegetable crops are looking pretty good across the Pee Dee. Fields that have received rain or are irrigated look very good. Fields that have missed the rain are a bit drought-stressed. Sweet corn, peas, butterbeans, tomatoes, squash, watermelons, cantaloupes, and cucumbers are being harvested in good volume. Okra is just beginning to be harvested well. Growers are still fighting cucurbit downy mildew (CDM) on cucumbers. Fields sprayed with fungicides for CDM (Orondis Opti, Gavel, Ranman, and Omega) are relatively clean and producing well. Fields that have not received those products are in severe decline. Cowpea curculio is still being a challenge. Some growers have asked about adding PBO8 (Piperonyl Butoxide) synergist to their insecticide application. Research has shown some efficacy, so it does help. But, it is not the silver bullet that everyone wants. There really is no alternative to having a robust spray program, spraying every three to five days starting prior to bloom.

Many varieties of blueberries have already finished up, with only mid-late and late rabbiteye blueberries going now. Blackberries have finished up, as well. Summer primocane tipping and floricane removal has begun. Be sure to apply a broad-based fungicide to all open wounds/pruning cuts to prevent disease development (i.e., cane blight, etc.). Muscadines are sizing up pretty well. Grape root borer traps have been placed in vineyards, but no moths captured yet.

Upstate Region

Kerrie Roach reports, “Things in the Upstate were a little wet the last few days, and it looks like showers will continue into the middle part of the week at least. Continue preventative measures for disease control, and if/when a plant seems too far involved, remove and dispose of the entire plant to prevent further spread. Squash vine borer has been one of the continued problems in market garden production in the last 2 weeks. At this late point in the season and lifecycle, monitor plants closely, and as soon as frass is seen, carefully cut the stem longitudinally and remove/kill the larval stage of the borer. You can mound soil on the cut part of the stem to help encourage new root growth. If done early enough, plants can continue to thrive despite the slice in the stem. New plantings of cucurbits set out in the last week or so should mature after the adults have finished laying eggs, but monitor closely for any wilting. Crop rotation, row covers, traps (yellow bowl of water), and pesticide applications can also be used as a part of a good IPM program. Check out the crop handbook for more specifics.

Organic Upstate vegetable production. Kerrie Roach, ©2021, Clemson Extension

Organic Upstate vegetable production.
Kerrie Roach, ©2021, Clemson Extension

Andy Rollins reports, “We are having thrips issues on 3 crops peaches, pepper, and cucumber. As seen in the picture, thrips cause surface damage to the outside, making fruit aesthetically less appealing and marketable. On pepper, they damage the leaves and can transmit viruses to the plant (on cucumber also). They are much worse in greenhouse and high-tunnel settings.  I have been recently concerned about the presence of chili thrips, and I am waiting on definite identification. This is a good website about this new pest. I also found a rare disease called foot rot of squash in the upstate. Dr. Tony Keinath identified it. Rotation is very important with all of our vegetable crops. We are picking some excellent quality peaches in the upstate. Cold damage has limited our wholesale picking.”

Thrips injury to peaches. Andy Rollins, ©2021, Clemson Extension

Thrips injury to peaches.
Andy Rollins, ©2021, Clemson Extension

Fusarium foot rot of squash. Andy Rollins, ©2021, Clemson Extension

Fusarium foot rot of squash.
Andy Rollins, ©2021, Clemson Extension

If this document didn’t answer your questions, please contact HGIC at hgic@clemson.edu or 1-888-656-9988.

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