Improving diquat efficacy on grasses by adding adjuvants to the spray solution before use

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Abstract

The effect of five adjuvants (non-ionic surfactant, paraffinic oil, vegetable oil, mixture of fatty acids methyl esters plus surfactant blend, and organosilicone) on diquat efficacy was assessed on poverty brome, sterile oat, and Italian ryegrass in field and pot experiments. All tank mixtures with diquat increased diquat efficacy from 50-54% to 77-98% as for fresh weight reduction, indicating significant enhancement of diquat efficacy on grasses. The increased efficacy was most likely attributed to better droplet retention and diffusion on the leaf surfaces. When combined with non-ionic surfactant, diquat showed slightly more rapid control of grass weeds (i.e. symptoms were visible within a few hours after application).

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Gitsopoulos, T. K., Damalas, C. A., & Georgoulas, I. (2014). Improving diquat efficacy on grasses by adding adjuvants to the spray solution before use. Planta Daninha, 32(2), 355–360. https://doi.org/10.1590/S0100-83582014000200013

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