Weekly Field Update – 5/3/21

Coastal

Rob Last reports, “Botrytis (gray mold) is evident in places following rainfall. Sanitation and removal of the infected berries are critical to reducing inoculum loading. Fungicide applications will also be required to prevent spore germination and further spread of the disease. Where spider mite treatments have been applied, they have effectively reduced the populations but will still require scouting and monitoring.  Yields achieved are very good. Cucurbit crops continue to develop well with a low incidence of chill injury from the cooler temperatures observed on April 21/22. Crops are running well, with some flowering being observed. Cucumber beetles are being monitored, and a few aphids are present in places. Cucumber beetles observed are currently below the threshold of 5 beetles per plant. Squash bugs are also being found on some sites. Careful monitoring will be required because numbers can increase rapidly. Crops are free from disease; however, protectant fungicides are still a critical input. Blueberries are swelling well and beginning to blush.  Blackberries are flowering with excellent fruit set and bud formation. Spider mites have been evident in these crops too; however miticide applications are proving very effective.

Squash bugs are showing up in the coastal region. Photo from Rob Last.

Zack Snipes reports, “We had another nice week of weather in the Lowcountry. We are starting to dry out again so some rain would be nice. All of our crops look really great right now with no huge issues. The biggest issue I see right now is spider mites on all crops which makes sense with the warm dry weather. I’ve gotten a few calls about some strawberry plants putting out runners. We need to get in the fields and pinch those off while we are cleaning up dead berries, blossoms, and tissue. I have been in several vegetable fields lately and seen some inconsistencies in plant growth and vigor. Upon further inspection of some tomato and squash crops, I found galling on the roots which is an indicator of root-knot nematodes. If this is the case on your farm, pull up a few plants and look at the roots. We need to keep good notes on where these areas or fields are and practice good crop rotation for next season or use resistant cultivars. There are some cover crops that help with suppression as well. If you want to pull a soil sample to check for nematodes, give your local agent a call. We are doing a statewide survey looking for the guava root-knot nematode and can assist with sampling. In case you missed the “Update from the Tomato Fields” talk last Wednesday, here is the link.

Smaller squash plants in a large field made me question root-knot nematode damage.  Upon inspection of the roots, I found galling which is an indicator of nematode pressure. Photo from Zack Snipes.

Midlands

Justin Ballew reports, “The weather last week was mild and it is very dry again. The inch of rain we got last weekend didn’t go very far. Strawberries are still yielding well, though in some fields, we’re starting to see berry size decrease, like we frequently see towards the end of picking. Folks had to remove water-damaged berries from their fields following the rain this past weekend. I guess the silver lining in this dry spell is we haven’t had many water-damaged berries yet this year. We’re still seeing some mites here and there, but disease pressure remains low. I found a berry last week with an anthracnose fruit rot lesion for the first time this season. So even though disease pressure is low, we still need to keep up with fungicide programs. There is some rain in the forecast for this week, so now would be a good time to throw in one of the site specific fungicides.”

Fungicides with the best efficacy on gray mold (left) and anthracnose (right) Photo from MyIPM app.
Cabbage with some cold damage from the cold a little over a week ago. Photo from Justin Ballew

Sarah Scott reports, “Along the Ridge, crews are still finishing up thinning in peach orchards to ensure good sizing on fruit. We are well into our summer cover spray programs for the season. During pit hardening it is critical to do preventative treatment for bacterial spot. Growers should be watching for plum circulio activity as well as scale crawlers in the next week as well. Sime powdery mildew has been found on foliage. Refer the the 2021 SE Peach, Nectarine, and Plum Management Guide for specific treatment recommendations. Strawberries are performing well. Some spider mite activity as well as some botrytis in the fields, which could worsen with several days of wet weather in the forecast. Transplanting of summer crops continues, including tomatoes and peppers. Curcurbits are becoming established and harvest will begin soon. 

Peach tree after thinning. Notice all of the green fruit on the ground surrounding it. Photo from Sarah Scott.

Pee Dee

Tony Melton reports, “Tomatoes, peppers, cucumber, and sweet potato slips are really growing since it has warmed up. Getting ready to sidedress and plow cucumbers. Fresh market cabbage will be ready to harvest soon. Processing collards are almost ready to harvest- some downy mildew has been seen. Asparagus suffered from excessive rains last year. Saw some sunscald and chemical burn on strawberries, so watch what products you are applying foliar, especially fertilizers. With the small amount of rain we had last week many acres of peas have been planted; however, it is awfully dry again.”

Field Update – 4/27/20

Late last week, the Clemson Agribusiness team sent out some updated information on the Paycheck Protection Program (PPP) and the Emergency Injury Disaster Loans (EIDL).  Be sure to take a look at that info here.

Coastal

Zack Snipes reports, “We had a few storms last week that brought heavy rains to the Lowcountry totaling 5 inches in some places.  The good news is that wind and sunny days have followed those storms which is helping to dry things out.  Highbush blueberries are in mid-harvest right now and rabbiteye varieties are sizing up and may be somewhat early this year. Our strawberry crop has been disappointing this year in terms of yield.  I am seeing a ton of thrips damage in strawberry.  The threshold used for thrips is 10 per blossom.  More thrips information from NC State.  Tomato and watermelon growers need to be scouting for thrips, as problems will develop later on from infestations we are having now.  I found the first cucumber beetles (striped and spotted) on crops this spring.  We had terrible infestations last year on cucumbers and melons that made fruit unmarketable.  If you find these on your farm you need to develop a plan to manage them (first generation) right now.”

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Severe Thrips damage causes unmarketable fruit. Photo from Zack Snipes.

Midlands

Justin Ballew reports, “We had really nice weather last week and crops are growing very well. Strawberry harvest volumes are still good, but it appears bloom is slowing down in some fields.  Thrips pressure has been high recently and we’re seeing damage on some berries as a result.  If thrips are present, they can be found in the flowers or under the cap leaves of developing berries. If you’re seeing lots of damage, an application of Radiant may be needed. Brassicas are growing quickly right now. We’re still seeing high pressure of diamondback moth caterpillars.  Be sure to rotate insecticide MOA’s when treating for DBM.  If you suspect a population of DBM has developed resistance to one or more insecticides, let us know and we can arrange to test that population.”

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Thrips damage is characterized by a bronze color and cracks in the skin of the berry. Photo from Justin Ballew

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A young broccoli head, about an inch and a half wide, beginning to form. Photo from Justin Ballew

Pee Dee

Bruce McLean reports, “Strawberries, strawberries! Strawberries are coming off very well, right now. Quality is for-the-most-part very good, although last week’s showers did cause some water damaged fruit in some locations. Blueberry harvest should begin later this week. Volumes will be very light for the first week or so but should pick up soon. Muscadines are looking good, so far. Carlos variety is just beginning to bloom. Vegetables are still being planted heavily. Potatoes and greens are looking very good.”

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Pandorus Sphinx Moth hanging out in the muscadine vineyard at Pee Dee REC. Photo from Bruce McLean.

Tony Melton reports, “Late peach varieties have a short crop, early ones are ok.  Strawberry glut is over now producing a normal crop of smaller fruit.  Early large crop with big fruit was a large strain on the plants.  Thank goodness for these cool temperatures allowing flowers to set which should give us a good set into June.  Beans, cucumbers, and peas are slow due to these cool temperatures and wind.  Some having damping-off problems and applying Quadris or potassium phosphide now.  Mowing tops of sweet potatoes in the beds now and will be planting in a week or so.  Yellow margined beetle on brassicas getting worse in parts of the Pee Dee – look for the ugly small larvae eating leaves – easy to see.”

Upstate

Andy Rollins reports, “We are finding San Jose scale on peach in the upstate.  Crawling stage is out now and sprays are recommended for this pest.  It can when build up and completely kill a block of peach trees.  It is worse on late-season varieties.  Movento, Esteem, and Centaur are all labeled on this crop for that pest.  Make sure to remove completely dead limbs before spraying, if possible, and make sure you get extremely good coverage.  200 gallons of total spray solution is recommended to achieve that goal.”

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San Jose scale on a dead peach limb. Photo from Andy Rollins.

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Be sure to remove dead limbs prior to spraying for San Jose scale.  Photo from Andy Rollins.