2024/04/10 by Jatinder S. Aulakh, Anthony L. Witcher, Vipan Kumar · 1 voice
Agricultural and Biological Sciences · #Flowering Plant Growth and Cultivation #Plant Physiology and Cultivation Studies
paper · pdf · doi:10.21273/horttech05372-23
openalex publication_date 2024/04/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/05/21
Ornamental plant and weed response to oxyfluorfen + prodiamine herbicide was evaluated in Connecticut and Tennessee, USA, in 2017 and 2018. Preemergence application of oxyfluorfen + prodiamine was made at 0 lb/acre, 2 + 0.75 lb/acre, 4 + 1.5 lb/acre, and 8 + 3 lb/acre to container-grown ornamental plants on an outdoor gravel pad and weeds in greenhouse experiments. Ornamental plants were treated first within a week after transplanting and again 6 weeks after the first treatment. Asiatic jasmine ( Trachelospermum asiaticum ), candlestick plant ( Senna alata ), and English ivy ( Hedera helix ) in Tennessee, USA; and ‘Blue Flag’ iris ( Iris sp.), ‘Firecracker’ gladiolus ( Gladiolus sp.), and ‘Green Carpet’ Japanese pachysandra ( Pachysandra terminalis ) in Connecticut, USA, were not injured with oxyfluorfen + prodiamine regardless of rate applied. Lily-of-the-Nile ( Agapanthus africanus ) in Tennessee, USA, and ‘Bowles’ periwinkle ( Vinca minor ) in Connecticut, USA, showed minor but commercially acceptable growth reduction with oxyfluorfen + prodiamine up to 4 + 1.5 lb/acre. Shasta daisy ( Leucanthemum × superbum ) in Connecticut, USA, was the most sensitive ornamental plant. After the first application, average necrotic injury to Shasta daisy varied from 24% with 2 + 0.75 lb/acre to 31% with 8 + 3 lb/acre of oxyfluorfen + prodiamine. After the second application, necrotic injury was ≤ 5% with all oxyfluorfen + prodiamine rates tested and was commercially acceptable (≤ 20%). Oxyfluorfen + prodiamine reduced densities of creeping woodsorrel ( Oxalis corniculata ), hairy bittercress ( Cardamine hirsuta ), giant foxtail ( Setaria faberi ), and large crabgrass ( Digitaria sanguinalis ) ≥ 80% by 4 weeks after treatment. The fresh weed biomass 6 weeks after treatment indicated an 88% to 99% reduction compared with the untreated control.