Captan Could Be Scarce in 2021

From Clemson Fruit Pathologist Dr. Guido Schnabel and UGA Fruit Pathologist Dr. Phil Brannen.

Unfortunately, there appears to be a shortage of Captan products this year. For our fruit crop producers this may result in a change of strategy if and when reserves run out. Strawberry growers fortunately have the option to use Thiram for basic gray mold and anthracnose control. The two products are basically equal in efficacy but thiram has a slight edge over captan for gray mold control, but it is a bit weaker against anthracnose.

Peach growers rely on captan for cover sprays. These early to mid-season applications manage green fruit rot and possibly anthracnose. Fortunately, during bloom and preharvest we use different chemistries at our disposal listed in the spray guide. As we mention often, we prefer to hold other chemical classes, those for which Monilinia fructicola (brown rot) is most likely to develop resistance, for use in the pre-harvest sprays. During captan shortage, we recommend application of two applications of a QoI/SDHI (FRAC 7+11) product, such as Luna Sensation, Merivon, Pristine or Quadris Top (FRAC 3+11), for cover sprays as needed this year. Along with any remaining captan products, we hope that this will help us to limp along till next year, while still providing excellent control of cover spray pathogens. Sulfur alone in cover sprays, though sufficient for scab control, is not efficacious for green fruit rot or other diseases; if using a QoI/SDHI (7+11) product, these will control scab as well as green fruit rot, so sulfur would not be necessary for these applications. As always, please contact your local extension agent should you have questions.

Field Update – 4/6/20

At this point, only a few cities (Columbia, Charleston, and Myrtle Beach) have issued shelter-in-place orders.  The Commissioner of Agriculture, Hugh Weathers, has drafted a Notice of Essential Food and Agriculture Employee form that farms in these areas may fill out for each employee certifying them as an essential employee.  They should keep this letter with them while commuting to and from work.  Commissioner Weathers also sent this letter to the law enforcement community in regards to his notice.

Coastal

Zack Snipes reports, “A beautiful week of weather for working outside this past week.  Our spring crops look great as well as our early summer planted crops. Tomatoes look great and have really jumped.  I found some cranberry fruit worm in highbush blueberries last week that all blueberry growers will want to keep an eye out for.  Local produce sales are in great demand right now with lots of growers finding new ways to sell to new clientele.  Strawberry season is in full swing with U-pick operations having trouble keeping up with demand.  I’ve seen lots of makeshift handwashing stations at U-Pick farms, which I applaud growers for.  Had a few calls about thrips in strawberry this past week so keep an eye out for damage.  In every strawberry field that I was in this past week, I saw hot spots of spider mites.  Scout your fields, the entire field, daily and treat the hot spots before you have to treat the entire field.  It will save you money on both treatment and potential yield loss.”

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Handwashing stations at U-Picks are protecting both growers and customers. This one was set up for around $70. Photo from Zack Snipes.

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Thrips damage on strawberry will leave the berry with a bronzed look and the outside of the berry will be hard resembling a plastic coating. Photo from Zack Snipes.

Midlands

Justin Ballew reports, “The weather was a little cooler this past week than the week before.  We also had a little rain early in the week and dew several mornings. These were perfect conditions for Botrytis and anthracnose to develop in strawberries and both showed up in a number of places.  We have a lot of blooms and green fruit out there right now, so make sure to stay on a good spray schedule and rotate MOA’s.  Spider mite pressure remains high in some places. Strawberry yields have not picked up yet and growers are easily selling everything they pick. Brassicas are growing fast in this beautiful weather. Caterpillar pressure is still up requiring widespread sprays. Keep scouting.”

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Botrytis developing on a strawberry.  Weather conditions have been perfect for Botrytis and anthracnose recently. Photo from Justin Ballew.

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Strawberry yields have not picked up yet, but we have lots of blooms and green fruit coming on. Photo from Justin Ballew.

Sarah Scott reports, “Peach trees continue to progress,  thinning of fruit is happening for some varieties now. Strawberry crop is beginning to pick up. Cooler night temperatures last week slowed ripening some. Vegetable crops continue to be planted including eggplant and peppers.”

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Broccoli plants growing well in Saluda County. Photo from Sarah Scott.

Pee Dee

Tony Melton reports, “Full speed planting processing vegetables.  Pickles, green beans, Butterbeans, peas, peppers, tomatoes are being planted.  Having trouble getting all the strawberries picked.  2nd Butterbean planting going in. 3rd sweet corn planting going in.”

Upstate

Kerrie Roach reports, “With beautiful skies and warm weather this past week, our upstate market gardeners are beginning to put things in the ground. While a little early for some, others are hedging their bets with multiple plantings over the next few weeks. Apples and peaches are continuing to progress with most apple varieties now in or near full bloom.”

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Tomato transplants for sale at a local garden supplier. Photo from Kerrie Roach.

 

Field Update 11/18

Coastal

Zack Snipes

We have had a good bit of rain and some cooler temperatures this past week.  I have noticed damage to strawberries in fields with no fencing that will cause significant yield loss this spring. I have also noticed areas in fields where deer are going under fencing. Be sure to scout your fields and take note of where deer might be entering in your field and make necessary adjustments.  In one particular case the outside fence was slightly higher in one area which allowed the deer to walk under.  I found one field where the fence was not plugged back in after workers exited.  Be sure your fencing is on all the time.

Deer found the high spot in the fence and are beginning to travel under.

 

 

Pee Dee

Tony Melton

Sweet potato tops are dead but we are still harvesting for processing.  Greens were damaged a small amount from the cold last week.  We saw a little worse damage in upper Chesterfield and in Lancaster County than in other areas.

Upstate

Andy Rollins

Close inspection of young peach trees in this case revealed two problems.  Greater peach tree borer GPTB and scale.  If growers are seeing this jelly at the base of there trees they need to inspect further many times it is GPTB but not always.  This problem can be treated with mating disruption using PTB duel.  Young trees need to be trunk  treated with chlorpyrifos “Lorsban”.  Scale problem is the white looking dots along the trunk.  Dormant oil applications should help with reducing this problem but shouldn’t be overlooked.  Keep inspecting closely.

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Jelly coming from the base of peach trees could indicate Greater peach tree borer (GPTB) presence.  Note the scale (white dots) on the trunk.

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Peach orchard in Upstate SC