The granular preemergent herbicides Snapshot TG (isoxaben + trifluralin) and Stakeout (dithiopyr) wre evaluated as an alternative to Snapshot DF (isoxaben + oryzalin) for control of spotted spurge (Chamaesyce maculata [formerly Euphorbia maculata]) in container-grown daylily (Hemerocallis × ‘Aztec Gold’). Stakeout (dithiopyr) at 1.1, 1.7, or 2.2 kg ai/ha (1.0, 1.5, 2.0 lb ai/A) and Snapshot TG (isoxaben + tritluralin) at 5.6 kg ai/ha (5.0 lb ai/A) were as effective as Rout (oxyfluorfen + oryzalin) at 3.4 kg ai/ha (3.0 lb ai/A), Snapshot (DF (isoxaben + oryzalin) at 4.5 kg ai/ha (4.0 lb ai/A), or Gallery (isoxaben) at 1.1 kg ai/ha (1.0 lb ai/A) in controlling spotted spurge. Rout (oxyfluorfen + oryzalin) and Ronstar G (oxadiazon) caused significant injury (bleached spots that became necrotic) while the other herbicides caused little to no damage.

Chamaesyce maculata, phytotoxicity, weed control, Hemerocallis
Aztec Gold daylily, Hemerocallis × ‘Aztec Gold’
Gallery DF (isoxaben), N-[3-(l-ethyl-l-methylpropyl)-5-isoxazolyl]-2,6-dimethoxybenzamide, Ronstar G (oxadiazon), 3-[2,4-dichloro-5-(1-methylethoxy)phenyl]-5-(1,1-dimethyl)-1,3,4-oxdiazol-2-(3H)-one, Rout (oxyfluorfen + oryzalin), 2-chloro-l-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl)benzene + 4-(dipropylamino)-3,5-dinitrobenzenesulfonamide, Snapshot DF (isoxaben + oryzalin), N-[3-(1-ethy1-1-methylpropyl)-5-isoxazolyl]-2,6-dimethoxybenzamide + 4-(dipropylamino)3,5-dinitrobenzenesulfonamide, Snapshot TG (isoxaben + trifluralin), N-[3-(1-ethyl-1-methylpropyl)-5-isoxazolyl]-2,6-dimethoxybenzamide + 2,6-dinitro-N-N-dipropy1-4-(trifluoromethyl)benzenamine, Stakeout (dithiopyr), S,S-dimethyl 2-(difluoromethyl)-4(2-methylpropyl)-6-(trifluoromethyl)-3,5-pyridinedicarbothioate.
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Author notes

Florida Agricultural Experiment Station Journal Series No. R-O 1672. Special thanks to Dr. Gary W. Knox for his assistance in this project.

2Assistant Professor.

3Senior Biological Scientist.

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1992