Uptake of glyphosate into wheat surfactant interaction and mechanistic implications

Abstract

Glyphosate uptake into wheat in the presence of Mon 0818 a tallow amine surfactant varied with both ai and surfactant dose on the leaf surface A high level of uptake (> 80 at 24 h) was recorded when the glyphosate dose was ge; 024 g/mm² or when the Mon 0818 dose was ge; 048 g/mm² When Mon 0818 and Silwet L77 were used together although droplet spread area and ai dose changed glyphosate uptake was still dose dependant and the threshold dose for 80 uptake (at 24 h) was still between 0203 g/mm² This suggests that L77 has no negative effect per se on glyphosate uptake in the presence of Mon 0818 apart from affecting droplet spreading