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Absorption of "C-labeled glyphosate by whole carrot (Daucus carota L.) plants infected or not infected by swamp dodder (Cuscuta gronovii Willd ex R & S) increased from 14% 1 day after treatment to 56% 14 days after treatment. Absorption of 14 C-labeled glyphosate did not increase from 14 to 45 days after treatment. 14 Carbon-labeled glyphosate appeared in the carrot root 1 day after application and its concentration increased with time in both infected and noninfected plants until 14 days after treatment. From 14 to 45 days after treatment, the concentration of 14 C-labeled glyphosate in the roots decreased. At 1 day after treatment, dodder tissue contained as much 14 C- labeled glyphosate as any physiological sink in the carrot. At 45 days after treatment, dodder tissue contained more 14 C-labeled glyphosate than all other physiological sinks, except the petiole of the treated leaf. Swamp dodder stems had absorbed 14 C-labeled glyphosate directly from a solution within 1 day after treatment. Chemical name used: N- (phosphonomethyl)glycine (glyphosphate). Dodder (Cuscuta spp.) is a problem weed in various horti- cultural crops (Dawson et al., 1984), including carrot. Dodder is a phanerogamic parasite that invades host plants by means of haustoria. The haustoria grow between the host cells and pro- duce "hyphae" of two types. Search hyphae grow either inter- or intra-cellularly until contacting host sieve tube elements. The tip of the hyphae differentiates several finger-like projections, the contact hyphae. These grow between the sieve tube element and the surrounding host cells (Kuijt, 1977). It is through the haustoria that dodder obtains photoassimilates from the host plant. There is evidence that dodder obtains the majority of its growth substances from the host phloem (Wolswinkel, 1977). Phloem-mobile herbicides, such as glyphosate (GLY), are more efficient in entering dodder tissue from the host than are xylem- mobile herbicides (Fer, 1981).

Absorption and Translocation of Glyphosate by Carrot Infected by Swamp Dodder