Home Farm Equipment Insect management in the Midsouth: What to know in 2021

Insect management in the Midsouth: What to know in 2021


It’s true yearly is completely different in farming, however in the Midsouth, you possibly can nearly at all times depend on insect strain creating potential issues. As crop scouting begins in earnest for a lot of the area, we caught up with Angus Catchot, Extension entomologist with Mississippi State College, to talk about probably pest points, how the previous winter’s excessive chilly may assist and damage, upcoming analysis that has him very excited, and in the end, what growers can do to shield yield. 

Delta Farm Press: Thrips are in all probability prime of thoughts for a lot of Midsouth cotton growers right here in early June. What are your suggestions? And the way involved ought to growers be about acephate resistance? 

Angus Catchot: In elements of the Midsouth area, notably Tennessee, we have documented the starting of acephate resistance in thrips. It’s undoubtedly one thing to preserve in thoughts, nevertheless it additionally doesn’t imply that utilizing acephate is not a very good apply. Many growers, notably in Mississippi, have opted to add both an over therapy of acephate or an in-furrow acephate utility to make up for a few of the weaknesses of the imidacloprid seed therapy.  These functions gained’t essentially get rid of the want to spray a foliar insecticide for thrips, nevertheless it definitely reduces the probabilities in many conditions. Coupled with imidacloprid, acephate continues to be offering fairly good thrips management for us.  

Nonetheless, the day might be coming the place acephate resistance in tobacco thrips might be a large scale downside. Growers ought to preserve that in thoughts when eager about foliar choices for thrips, notably if you use a therapy of acephate and see a breakthrough. You wouldn’t need to observe that utility with a foliar acephate utility. At that time, you need to take into account one thing like Bidren, dimethoate, or Intrepid Edge. Intrepid Edge could be my first selection. It prices just a little extra, however it really works properly and doesn’t flare secondary pests resembling aphids or spider mites. 

DFP: Sticking with cotton, as we glance forward to the coming weeks plant bugs might be the subsequent pest on the horizon. What ought to growers take into account for plant bug management? 

Catchot: If a subject reaches threshold as cotton begins squaring, I’d be pleased with utilizing imidacloprid one time. It’s low cost and in the very early squaring stage will do an enough job hanging squares. However after that we sometimes don’t like utilizing imidacloprid for plant bugs. It simply doesn’t present sufficient management. After pinhead sq. we want to begin transferring to different merchandise that truly present higher management, resembling Rework.  

A lot of individuals will use acephate in that early squaring window. I’d love for them to preserve acephate off as a lot as they’ll in the early levels to keep away from flaring secondary pests. I know lots of people will use it anyway. That’s unlucky as a result of rotating pesticides is essential for plant bug management and we’re going to undoubtedly want acephate after we get into the bloom interval. Moreover, acephate is horrible for flaring spider mites and aphids. 

Throughout most of the Midsouth area, as soon as we get in that third week of squaring or transferring into first bloom, we actually want to consider using Diamond. Our information actually helps that early use of Diamond throughout the peak migration of adults. It’s been actually good for us over the previous few years and one thing growers want to preserve in thoughts.  

Angus Catchot

Tarnished plant bugs are one in every of the most vital pests for Midsouth cotton producers.

DFP: With the first a part of Could being cool and moist, plenty of cotton planting didn’t start till mid-Could. Do you anticipate planting dates having an impact on insect species or strain? 

Catchot: Anytime you push plantings later there might be points, however in cotton I nonetheless assume we’ll take care of the regular suspects, that are thrips, plant bugs, spider mites and bollworms, to some extent. We take care of these pests no matter planting date. The one wild card could be aphids. Yearly is completely different with aphids. Two years in the past, we had excessive strain. This previous yr was very gentle. Aphids can come in anytime all through the season. In 2019 we noticed plenty of aphids on 2- to 4-leaf cotton. Final yr we noticed hardly any at that stage. It’s actually onerous to predict the aphid state of affairs. Nonetheless, we do know if they’re current and we spray a disruptive insecticide, we will definitely make them a lot worse. 

DFP: Transferring to soybeans, what are you able to inform us about redbanded stink bug populations? 

Catchot: A lot of individuals have questioned what they may face this yr with redbanded stink bugs. This previous winter, most of the Midsouth area skilled 7 to 10 days of actually chilly climate, so our expectation going into this season was redbanded stink bug strain could be a lot decrease. For the most half, I nonetheless assume that’s right, however from all of our ditch financial institution surveys, we did have a few hotspots as far north as Freeway 82 (which runs via Starkville, Miss.) the place we had been working some fairly first rate numbers. That’s just a little little bit of a shock, however general, I’d say the numbers are actually low. 

Going into this yr, I believe our early beans will in all probability escape redbanded stink bugs for the most half. However we do have extra wheat this yr and extra wheat beans. Given what we’ve seen in a couple of areas, we may have to take care of redbanded stink bugs in some areas, notably in the southern spots. What it’s going to actually depend upon is if the few hotspots have sufficient time to construct up to an considerable stage and trigger issues in these localized areas. 

I nonetheless assume general our numbers are approach down, and that’s going to be very helpful.  

Angus CatchotBollworm in Boll.JPG

Bollworm in cotton boll.

DFP: Did the excessive winter temperatures have an effect on different pest populations? 

Catchot: We’ve seen plenty of bollworms in crimson clover this yr. It’s not unusual for us to have extra bollworms behind chilly winters and we’ve already seen quite a bit. I believe our numbers might be larger this yr due to winter climate. So, in cotton —notably Bollgard 2 cotton — we’re going to have to be very diligent on bollworms.  

DFP: Which analysis initiatives are you most enthusiastic about for 2021? 

Catchot: We now have quite a bit happening this yr, however I’m notably enthusiastic about seeing ThryvOn on extra acres. As this expertise will get nearer to market, it’s actually necessary to take a look at it on a bigger scale to validate what we’ve seen in our smaller analysis plots. We would like to look nearer at potential thresholds and spray regimes, so we will develop extra outlined suggestions for 2022 and past. 


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