Clemson Extension agents provide crop updates in The South Carolina Grower this week about the status of various crops being produced throughout the state.
Statewide
Dr. Matt Cutulle reports, “I saw my first nutsedge plants this year pop up in the plastic mulch of a fellow researcher’s trial last week in Charleston. Soil temperatures in plastic mulch systems are going to be higher, which may lead to earlier sprouting of yellow nutsedge tubers. POST applications of Sandea are effective for controlling emerged yellow nutsedge plants. New tubers begin forming four to six weeks after a new shoot emerges. Individual nutsedge plants may eventually form patches 10 feet or more in diameter. It is important to practice field sanitation once an infestation is recognized.”
Coastal Region
Rob Last reports, “Temperatures in the area dropped to 23 degrees Fahrenheit (F) as a low with 20% humidity and wind speeds 15 to 20 mph. The freezing temperatures started by 9 p.m. and lasted until mid-morning Sunday. As far as (Sunday night) goes, the overnight lows hit 29 F with much higher humidity and lower wind speeds. Damage assessments will begin this week.”
Zack Snipes reports, “Only time will tell the extent of the wind and cold we had this past weekend. We had 26 F on one station on the coast this weekend. The extended period of time below 32 F is really going to hurt us. The wind gusts may have done more damage than the cold. We hit 50 mph gusts, which ripped row covers off strawberries, ripped up plastic in the field and on greenhouses. Overall, I think the strawberry crop pulled through fine where folks used and kept row covers down. Blueberries got hit hard. The rabbiteyes were in full bloom and the highbush had lots of berries on them. I expect 50% losses or more in highbush and more than that in rabbiteye varieties. It is imperative that we do a good job cleaning up with sanitation and using both protective and systemic fungicides after this cold and wind. Remember that Georgia and Florida were both impacted by this weather too. They will get the first shot at transplants, so I am expecting plant shortages for our growers.”
Midlands
Justin Ballew reports, “The temperature in Lexington early Sunday morning got down to 23.9 F (according to our weather station). Row covers haven’t been removed from strawberry fields yet, so we don’t yet have a full understanding of how they weathered the cold. Theoretically, 1.2 oz covers should have minimized damage. Another weather station just east of Newberry read 19.4 F Sunday morning, so we do expect to see some damage in that area. Young brassica transplants suffered some damage to their older leaves. For now, the growing points appear to be alive. We’ll know more in a couple days, but we’re optimistic they’ll be able to grow out. Mustard and turnips also have some damaged leaves, but again, the growing points appear to be alive. We are hopeful here also.”
Pee Dee
Bruce McLean reports, “‘Well, that didn’t take long,’ was the comment from one of the blueberry growers on a text/picture sent to me. It showed damage to existing eraser-sized fruit, pad fruit and leaves. This damage was observed only hours after the temperature had started to rise on Sunday morning. Many growers chose not to frost protect for the freeze event due to very windy conditions overnight. Those gusty conditions subsided early Sunday morning (around 1 a.m. to 3 a.m.) allowing the temperature to continue to drop and frost to develop. About all of the Pee Dee experienced temperatures in the mid-to-low 20s. The lowest temperature I heard was 22 F in the Loris area, but I am sure lower temps were probably observed. Freeze events, like this, are extremely difficult to protect against. Often, running overhead freeze protection leads to worse damage than not protecting at all. In contrast, the localized freeze that occurred Sunday night/Monday morning was much more conducive to having ideal freeze protection. Unfortunately, blueberry growers have experienced these conditions more over the last few years. For all growers, it may take a few days for cold injury to fully reveal itself. Special attention in the way of a fungicide application (to guard against fungal development) and some hand labor may be required. In other news… strawberry growers, be on the lookout for increased fungal activity due to the increase in moisture. Botrytis has really started to show up this past week. Leaf spot is on the rise, too. Be sure to remove any cold-damaged flowers and tissue and any infected tissue. Also, fungicides targeted for Botrytis are likely needed. Getting a handle on Botrytis early in the season will pay off on maximizing fruit quality and pack-out come harvest season.”
Upstate
Kerrie Roach reports, “The effect of the past weekend’s freeze event will not be fully known for a while yet. At one of the weather stations in Long Creek, SC, it was below freezing for about 20 hours, and below 25 F for about 12 hours. As far as apples are concerned, we did have some early varieties like Mutsu in ‘tight cluster’ stage at some orchards, but most of the crops were ‘half-inch green’ or earlier. There will definitely be damage from the cold temperatures, but it’s unknown if it will be a thinning of varieties or loss. I would be confident in saying that any of our peaches that were in bloom are a loss. Mid and late-season varieties should be okay, but again, we will not know the damages until a week or so. The biggest thing for us in the Upstate is that it’s still March, and we still have over a month to go before we’re in the clear of potential frost or freeze events.”
Andy Rollins reports, “Farms spent last week preparing for the freeze event. Winds came in earlier than expected with near-freezing temperatures at 5 p.m. on Saturday, March 12. Winds were still so high that growers chose not to turn on sprinklers. Strawberry growers were advised to put on every row cover they had and make sure they were secure. We still suffered some damage under the cover as temperatures dropped to 20 F. Covers only held us at 26 F. Some peach farms ran wind machines. We started around 11:30 p.m. while others started earlier at 10 p.m. As soon as the sun dropped, temperatures dropped, and winds slowed earlier than predicted. Blooms from those fields do look better than those not protected, but temperatures were so low. We’re not sure how much damage was done yet. I will be looking at other crops this week to assess damage.”