Comments From Dan Anco Clemson Peanut Notes No. 155 2023

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Tomato spotted wilt virus pressure is in no short supply this year. Attached are results from one of our thrips/TSW trials that was planted April 19 (96 DAP today) with FloRun 331, which is more susceptible to TSW than something like 06G but not as susceptible as TUFRunner 511. The April planting was an intentional move to encourage TSW development. Thimet is typically associated with the most control of TSW, but as evident here, even that treatment has noticeable TSW infections (~10%). Nevertheless, we can see the improved control there compared to some of the other treatments where it was not uncommon to have between 20 and 30% TSW infection. For reference, while TSW for Admire Pro and Vydate were not different from the NTC, those products did overall contribute effective management of thrips injury.
The attached images show several items from the canopy, including a velvetbean caterpillar moth. These tend to be more common in our mid- to southern-counties from Aug – Oct and are easy to control. Dimilin is effective to prevent new larvae from fully developing and can be added to fungicide application to provide later season protection (e.g., 90-105 DAP). Dimilin has a 28-day PHI. Established populations can be managed with a number of available options (excluding Dimilin), listed on page 59 of the production guide.
Also attached is a guide from Dr. Jordan that shows the target growth stage (50% of rows lapped, not rows 50% of the way closed) when an application of growth regulator would be applied (Apogee). While we have seen efficacy of growth regulator with some of the larger canopy producing runners (e.g., TR 297, FR 331…), we have typically not seen an economic benefit of applying growth regulator to Ga-06G. In several of our experiments, Ga-06G yield ended up decreasing with growth regulator application. When growing conditions support growth regulator use, I tend to recommend the 3/4x rate (5.4 oz/A) based on comparable efficacy as the full rate while saving on cost.

Dan Anco

Extension Peanut Specialist and Associate Professor

Department of Plant and Environmental Sciences

Clemson University – Edisto Research and Education Center

64 Research Road

Blackville, SC 29817

630-207-4926 cell