Effects of DCPA/Napropamide Herbicide Tank Mix on Germinants of Seven Hardwood Species in Tree Nursery Beds

Two pre-emergence herbicides-DCPA (Dacthal®) and napropamide (Devrinol®)-were applied as a tank mix of 4.76 kg(10.5 pounds) and .45 kg (1 pound) active ingredient per acre, respectively, to nursery beds of seedlings of 7 different hardwood species-hackberry (Celtis occidentalis L.), persimmon (Diospyros virginiana L.), Russian olive(Elaeagnus angustifolia L.), euonymus (Euonymus bungeanus Maxim.), American plum (Prunus americana Marsh.), sand plum (P angustifolia Marsh.), and choke-cherry (P virginiana L.)-at the time of germination but before seedling emergence. With the exception of American plum, germination counts and observations of seedling growth and condition revealed no damage from these herbicides on these hardwood species. Spring applications of these herbicides as a tank mix have several advantages over separate fall applications (just after sowing), including fewer applications of DCPA and napropamide needed to achieve adequate weed control, reduced loss of herbicide due to leaching and decomposition, reduced time spent spraying, and an increased window for application that achieves adequate control of weeds. Good weed control comparable to that achieved with separate applications of DCPA and napropamide was obtained with the tank mix. Tree Planters' Notes 44(4): 149-153; 1993.

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Author(s): Vincent A. Smith, David B. Orr, Elwood R. Hart

Publication: Tree Planters' Notes - Volumes 44, Number 4 (1993)

Section: Technical Tips

Volume: 44

Number: 4