Dominic Reisig Injury From Thrips Feeding at Lewiston-Woodville on June 17 Peanut Notes No. 120 2025

(Updated: June 18, 2025, 2:10 a.m.)

The following images are from a trial Dominic and his group have at the Peanut Belt Research Station this year. They have a similar trial at Upper Coastal Plain Research Station. At both locations, Hemi performed better than acephate (Orthene.) Bathroid and Bifenthrin were ineffective. Suppression of thrips by acephate has decreased significantly across northeastern North Carolina.

In Peanut Notes No. 6 2025, we have data from these comparisons in 2023 and 2024 (Radiant SC and Hemi SC have the same active ingredient.) Radiant SC has a slight edge over acephate in those trials.

Decreased sensitivity to acephate in thrips has also been reported by Tim Bryant at Tidewater AREC in Suffolk (see screen shot of a portion of a Virginia Ag Pest post.)

*These peanuts were not treated with insecticide at planting.

Baythroid 2.8 oz trial on peanuts.
Bifenthrin 6.4 oz trial on peanut.
Hemi 3 oz trial on peanuts.
Orthene 12 oz trial on peanut.
On Monday, May 26 the Tidewater AREC entomology team collected tobacco thrips from cotton throughout southeastern Virginia. These populations were sent to the University of Tennessee where they were tested in the lab for susceptibility to acephate, spinetoram (Hemi SC or Radiant), and dicrotophos (Bidrin). Across all the sites, the results were very consistent with, 75-79% mortality with acephate 100% mortality with spinetoram 47-50% mortality with dicrotophos We would classify this as tobacco thrips having reduced susceptibility to acephate in southeastern Virginia.
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David Jordan
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