Evaluation of herbicides against dodder (Cuscuta reflexa) infesting the hedges of bougainvillea (Bougainvillaea purpurea) and cleridendron (Cleridendron splendena).
Field experiments were conducted during 1998-2000, in Hisar and Punchkula, Haryana, India, to evaluate the efficacy of 5 different herbicides against dodder (Cuscuta reflexa). Results showed that glyphosate at 0.5% solution (v/v), MON 8793 at 2.7 kg/ha and MON 8794 at 1.8 kg/ha provided 85-95% control of C. reflexa on the hedges of bougainvillea (Bougainvillea purpurea) and clerodendron (Clerodendron splendena [Clerodendrum splendens]) up to 90 days after treatment at both locations. However, higher doses of these 3 herbicides caused toxicity to both bougainvillea (10-30%) and clerodendron (50-70%) without any additional efficacy against C. reflexa. At lower doses, the control of C. reflexa was not satisfactory. Glufosinate and 2,4-DE [2,4-D] as well as manual removal proved ineffective against this parasitic weed.