Field Update – 7/29/19

Coastal Region

Zack Snipes reports, “We are harvesting the last remaining things in the fields, preparing fields for fall planting, and planting fall pepper and tomato.  I found an interesting disease in watermelon this week that is known as bacterial rind necrosis.  While it is not entirely known what factors and pathogens cause the disease, it is thought that environmental conditions could increase the presence of this disease.  If you have seen this disease, take precaution by rotating fields, staying away from varieties known to have had symptoms in the past, and stay on top of irrigation and nutrient management.  I have also seen some spongy squash this week.  The combination of heat, high humidity, and poor pollination can all lead to poor quality squash.”

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Watermelon with discolored rind from rind necrosis. Photo from Zack Snipes.

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Soft squash as a result of poor environmental conditions. Photo from Zack Snipes.

Midlands

Justin Ballew reports, “The weather cooled down a few degrees towards the end of last week and felt nice.  Fall tomatoes, peppers, and eggplant are in the ground now.  Downy mildew was found in the midlands in slicing cucumbers this past week, so folks growing fall cucurbits definitely need to maintain a good spray schedule.  Also, late last week, bacterial wilt was confirmed for the first time in hemp.  In the future, growers will need to practice good rotation between hemp, tobacco, tomatoes, peppers, and eggplant.”

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Peppers planted for a fall crop. Photo from Justin Ballew.

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Industrial hemp plant wilting from bacterial wilt infection.  Photo from Justin Ballew.

Lalo Toledo reports, “Bell peppers are being planted in Orangeburg and Clarendon counties. Hemp is growing well and is expected to make a good harvest. Worm damage was found on some hemp plants in Orangeburg county. Collards are also being planted.  Mole crickets have been found tunneling in many collard fields.

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Hemp is growing well in Orangeburg. Photo from Lalo Toledo.

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Mole cricket tunneling around collard seedlings can expose young roots to the sun, causing them to dry out. Photo from Lalo Toledo.

 

Pee Dee Region

Bruce McLean reports, “Last week was a welcomed reprieve from the heat and humidity. Many crops seemed to respond positively from the temperature break, as well. Watermelon, cantaloupe volumes looked very good. Yellow squash, zucchini and cucumbers were well improved from the week before. Okra volume is on the rise, and should be coming off very well in a week or so. Peas and butterbeans, on the other hand, sustained significant damage from the heat and many plantings have dried up. The first of the week looks pretty dry with building temps. By the end of the week, some welcomed rain should be in the forecast.”

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Zucchini are doing well in the slightly lower temperatures. Photo from Bruce McLean.

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The volume of harvest of okra is rising in the Pee Dee. Photo from Bruce McLean

Field Update – 7/15/19

Coastal Region

Zack Snipes reports, “Most crops are finished here in the Lowcountry.  There are a few crops that are being harvested for the final time this week.  Fall watermelon and tomato are in the ground already.  I saw some interesting cucumber beetle larvae damage on watermelons this past week. This type of damage will result in loads of melons being rejected by buyers.  Crop rotation is a vital component to managing this pest.  If you have seen this type of damage, please reach out so we can develop a plan of attack for next season.  I attended the Edisto REC Watermelon Field Day this past week and learned about the future of robotics in agricultural production and had the opportunity to taste over 30 varieties of watermelons.

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Cucumber beetle larvae damage to watermelon rind. Photo from Zack Snipes

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Robotics demo at the Watermelon Field Day at Edisto REC, 7/11/19. Photo from Zack Snipes

Midlands

Justin Ballew reports, “We had some scattered rain over the last week.  Some folks are still needing some.  We’re winding down on the spring brassicas and cucurbits.  This is good because foliar diseases like anthracnose and powdery mildew are really increasing with the humidity.  We’re still picking tomatoes and have started picking peas.  Spider mites are picking up, so scout closely for those.  Hemp is growing well, though we’ve seen some seedling disease and cutworm damage in spots.”

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Anthracnose lesions on a cucumber leaf. Photo from Justin Ballew

Sarah Scott reports, “Hot and dry weather along the Ridge. Conditions have been favorable for increased spider mite and stink bug activity.

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Stippling from spider mite feeding damage on peach leaves. Photo from Sarah Scott

Upstate

Andy Rollins reports seeing some blackberry tips wilting from raspberry cane borers. “If you see this, they need to be cut off 6 inches below the 2 girdled lines you see below.  This material can be composted or you can just squish them.  Insecticide sprays can be helpful but only when applied before symptoms appear.  It is a type of beetle larvae that is feeding on the stem before becoming an adult.  Commercially, there would have to be a major infestation to warrant the extra labor.  Normally this won’t be present in a regularly sprayed crop.”

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Stem girdling from raspberry cane borer. Photo from Andy Rollins

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Raspberry cane borer larva inside of blackberry stem. Photo from Andy Rollins

Kerrie Roach reports Ginger Gold apples are being harvested in the upstate.

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Ginger Gold apples from the upstate. Photo from Kerrie Roach

Pee Dee

Bruce Mclean reports, “Well, it looks like another hot week is on tap for us this week. Squash, watermelons, cucumbers, cantaloupes, peas and peppers are coming off in good volumes.  Quality looks especially good on these crops.  Blueberries and sweet corn are finishing up.  Starting to see some disease in muscadines.  If you are seeing leaf spots in them, it may be time to evaluate and adjust your spray program. Also, starting to see early ripening of fruit.  Be on the look out for fruit rot.

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Muscadines ripening. Photo from Bruce McLean

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Black rot lesions on muscadine leaf. Photo from Bruce McLean

Tony Melton reports, “Cucumbers having hard time setting fruit in the heat – getting many nubbins (crooked fruit).  Parthenocarpic varieties seem to handle the heat better than regular pollinated varieties.   Processing tomato harvest is progressing quickly and about ½ complete.  Processing pea harvest will begin this week – thousands of acres ahead to harvest.  Processing hot pepper harvest has begun and will continue for a month.

Alternaria Leaf Blight Common This Year

From Clemson Extension Plant Pathologist Tony Keinath.

During the 2019 Cantaloupe Disease Survey, Alternaria leaf blight has been found in several fields. It was more common in fields that had not been sprayed recently than in fields sprayed on a regular schedule. It also was found in a field rotated only one year out of cantaloupe.

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Alternaria leaf blight lesions on cantaloupe leaf.

The FRAC Group 11 fungicides (Cabrio, Quadris, Flint) are the recommended fungicides. Although the gummy stem blight fungus is resistant to this group of fungicides, they still are very effective against Alternaria leaf blight on cantaloupe and anthracnose on watermelon.

Field Update – 6/17/19

Coastal Region

Zack Snipes reports, “We received a good amount of rain last week. Some farms got just the right amount while others received 15 inches or more. I am seeing disease now that the rain has passed in all crops, especially the tomato and cucurbit crops. Keep on top of your spray programs to finish the season out. I am also seeing some cracking in heirloom, cherry, and grape tomatoes because of the rain. Stink bugs are increasing in number and tomato growers should scout their crops for them and make adjustments to insecticide programs. On Friday I visited a farm that had buckwheat strips beside the cash crop. They had, by far, the least amount of insect pressure on their cash crops as a result of providing a beneficial insect refuge.

Stink bugs nymphs on a tomato. Photo from Zack Snipes
This buckwheat strip planted in the row middle provides refuge for beneficial insects. Photo from Zack Snipes.

Midlands

Justin Ballew reports, “The first half of the week was rainy, but by the end of the week, irrigation systems were running again in places. The temperatures have been pretty mild for mid June. Vegetables are growing fast since the rain and we’re picking sweet corn, green onions, tomatoes, peppers, squash, cucumbers, and zucchini now. We’re continuing to scout for downy mildew as it’s been found in several places on the coast now. It’s only a matter of time before it shows up here, so stay on top of spray programs. Hemp is also going in the ground.

Squash is growing fast. Photo from Justin Ballew
Hemp transplants ready to go to the field. Photo from Justin Ballew

Sarah Scott reports, “After a long period of dry weather, the recent rains have stirred up some cases of anthracnose in peaches and plums. Orchard floor and perimeter management of leguminous hosts and wild Prunus species can help prevent spread of this disease. Refer to the Southeastern Peach, Nectarine, and Plum Pest Management and Culture Guide for chemical recommendations to use pre-harvest. Peaches harvested in the Ridge are starting to get some size on them and are looking good.

Anthracnose on a peach. Photo from Sarah Scott
Peaches harvested on the Ridge are looking good. Photo from Sarah Scott.

Pee Dee Region

Tony Melton reports, “Only 1 farmer had butter beans to harvest. They were planted on March 23 and sneaked-by those last frosts.  After these the next harvests will be in July because of the heat causing flower drop and reset during the cool week of June 10.  It is drying out quickly and we will need another rain this week to keep crops going.  Collards are really doing well since the cool spell gave them relief from the heat.  Southern peas are flowering and need to be sprayed for cowpea cucurlio.  Snapbeans took a real hit from the heat and there will be poor yields except for later planted ones the flowered during the cool spell.

Field Update – 6/10/19

Statewide

Dr. Tony Keinath reported downy mildew being found on cucumbers in Bamberg County this past week. He cautioned all cucumber, cantaloupe, and watermelon growers to begin preventative sprays, if they are not already doing so. Refer back to this post for more info.

Downy mildew on cucumber leaves.

Coastal Region

Zack Snipes reports, “We finally got some much needed rain in the Lowcountry. I expect to see some disease to show up this week. Growers should be scouting all crops and spraying when needed. Downy mildew was found on cucurbits this week so be aware that you may see it in your fields as well. We had a great field day this week at the Coastal Research and Education Center.”

Clemson Plant Pathologist Tony Keinath discussing watermelon diseases at the Coastal REC Field Day. 6/5/19. Photo from Zack Snipes.

Midlands

Justin Ballew reports, “We had thunderstorms come through late in the week and it’s rained every day since. We needed it badly. Sweet corn and tomato picking has begun and they are looking good. We’re seeing a few stink bugs in sweet corn, but nothing severe. Powdery mildew is showing up on some cucurbits now that moisture has returned. Downy mildew could show up at any time here, so keep an eye out for that and stay on a good preventative spray schedule.

Sweetcorn ready for harvest. Photo from Justin Ballew
These tomatoes will be harvested soon. Photo from Justin Ballew

Sarah Scott reports, “Rain fall amounts range from 1 inch to over 5 throughout Aiken,Saluda and Edgefield Counties which will give irrigation systems a much needed break. Flea beetles are showing up on peppers.”

– Adult flea beetle and damage to pepper plant. Photos from Sarah Scott

Pee Dee Region

Tony Melton reports, “Pythium has been awful with all the heat.  Bad on snapbeans, cucumbers, etc.  Southern stem blight has been awful on tomatoes and peppers with the heat.  Black rot has taken over some kale, cabbage, collard fields.  Sensation strawberry has had very poor yields this spring but is still bearing in the heat.  Pickleworm is hear and is worse in yellow squash, then cucumbers, and then zucchini.  The heat caused the flowers to fall on the early planted butterbeans causing all the early plantings to come together with the later planting then with the rain and cooler temperatures all plantings are setting now.  It appears we may have butterbeans but all plantings will come in at the same time causing problems with marketing.”