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ARS Home » Southeast Area » Tifton, Georgia » Southeast Watershed Research » Research » Publications at this Location » Publication #392794
Research Project: Biologically-based Management Systems for Insect Pests and Pollinators in Agricultural Landscapes in the Southeastern Region

Location: Southeast Watershed Research

Title: Quantifying indaziflam soil dissipation and thermal stability

Author
item Porter, Kayla
item GREY, TIMOTHY - University Of Georgia
item CABRERA, MIGUEL - University Of Georgia
item BASINGER, NICHOLAS - University Of Georgia
item RUCKER, KEITH - Bayer Cropscience

Submitted to: Chemosphere
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/11/2022
Publication Date: N/A
Citation: N/A

Interpretive Summary: Despite wide use across the US in various perennial cropping systems, there is still little information available on the parameters affecting indaziflam’s soil behavior. Indaziflam half-life in Greenville sandy clay loam and Faceville loamy sand were 96 and 78 days, respectively. There was no indaziflam degradation by hydrolysis at any temperature. This is a unique and important aspect as there have been no previous reports relating how temperature is not a direct factor concerning indaziflam degradation. This has many positive implications for providing extended residual weed control as indaziflam is used in multiple facets including perennial crops, forages, industrial sites, and turf.

Technical Abstract: As a nonselective cellulose biosynthesis inhibitor, indaziflam has a niche for broad-spectrum weed control with long residual activity in various perennial cropping systems. Indaziflam’s soil persistence and chemical behavior at various temperatures has not been fully evaluated, therefore the objectives of these experiments were: (i) quantify indaziflam soil dissipation under field conditions in two common Georgia soils and (ii) evaluate indaziflam molecular stability as affected by temperature and time using laboratory techniques. Indaziflam soil dissipation followed first-order kinetics and was adequately described by the exponential decay equation. Indaziflam half-life in Greenville sandy clay loam and Faceville loamy sand were 96 and 78 days, respectively. Indaziflam half-life and soil clay content had a direct relationship, while indaziflam half-life and microbial biomass had an inverse relationship. Aqueous solutions of indaziflam were exposed to temperatures that ranged from 20 to 70°C for up to 672 hours, with results indicating that temperature had no influence on indaziflam molecular stability. Indaziflam is a long-term residual weed control option for Georgia pecan growers.