Herbicide options for management of Wedelia sps. and other weed species in Arecanut garden of coastal Karnataka

A field experiment was conducted during rabi 2023 at Farmer's field in Shirlal village of Karkala taluk, to study the “Herbicide Options for Management of Wedelia sps. and Other Weed Species in Arecanut Garden of Coastal Karnataka.’’ The experiment was laid out in RCBD design including ten treatments consisting of eight post-emergent (PoE) herbicides, which are replicated thrice. The investigation revealed that the post-emergent application of 2,4 D sodium salt 80% WP @ 1250 g a.i. ha^-1 at the 5-6 leaf stage showed a significantly lower weed density of Wedelia species (1.67, 2.00, 3.00, and 8.67 m^-2), whereas glyphosate 41% SL IPA salt showed significantly lower total weed density (7.67, 12.67, 31.33, and 41.67 m^-2), lower total weed dry matter production (9.37, 23.60, 37.83, and 47.27 g m^-2) and higher weed control efficiency (96.97, 95.16, 89.51 and 86.81%, respectively at 15, 30, 45 and 60 days after treatment incorporation (DATI). It was found to be on par with the post-emergent application of glyphosate 71% SG (ammonium salt) @ a.i. 2.13 kg ha^-1. Further, the application of glyphosate 41% SL IPA salt @ 1.230 kg ha^-1 a.i. ha^-1 has recorded a 63.66 per cent lower weeding cost of 3100 Rs ha^-1 compared to the farmer’s practice (Rs. 8530 ha^-1).