Absorption and Translocation of14C-Ethalfluralin in Cucumber (Cucumis sativus)

Abstract

Absorption and translocation of14C-ethalfluralin (N-ethyl-N-(2-methyl-2-propenyl)-2,6-dinitro-4-(trifluoromethyl)benzenamine) were measured in cucumber plants in the field and greenhouse. In field enclosures, cucumbers treated with 1.68 or 3.36 kg ai/ha preemergence soil-surface applications of14C-ethalfluralin accumulated significantly more14C in leaves than in petioles, stems, or fruits. In greenhouse studies,14C-ethalfluralin vapor was absorbed by both cucumber seedling stems and cotyledons. Seedlings absorbed14C-ethalfluralin from a nutrient solution and translocated14C into all plant parts. Cucumber absorbed14C-ethalfluralin topically applied to the stem and translocated14C acropetally, while only limited basipetal translocation occurred. Although cotyledons absorbed14C-ethalfluralin, very little14C moved out of the treated tissue.