Translocation of diquat in the tuliptree (Liriodendron tulipifera, L.)

Foliar application of the phytotoxic herbicide diquat dibromide was made to twenty tuliptree seedlings actively growing under field conditions on October 6, 1973, at the Purdue Davis farm in Randolph County, Indiana. Herbicidal extraction was accomplished by two extraction procedures: Langlois, et. al., (1963), and a method described in the Pesticide Analytical Manual (9/1/67). Herbicidal application methods utilized two concentrations and three time periods for translocation to occur.Results from the herbicidal application to the tuliptree seedlings indicate that diquat dibromide is present in all parts of the seedling trees within a two hour time period, and that relative amounts of diquat per plant organ are time dependent.Ball State UniversityMuncie, IN 47306