Author(s):

Bhimashankar, Shivaprasad M, Rajath HP, Dinesh Kumar M and Girijesh GK

Abstract: A field experiment entitled “Study on bio-efficacy of new post emergent herbicide molecules with pre-emergent herbicides in transplanted rice under hill zone of Karnataka” was conducted during Kharif season 2016 at Zonal Agricultural and Horticultural Research Station, Mudigere, to evaluate the suitable new post emergent herbicides along with pre-emergent herbicides in transplanted rice. The herbicides tested were two pre-emergent herbicides viz. Butachlor 50 EC, Bensulfuron methyl 0.6 + Pretilachlor 6 GR and five new post emergent herbicides viz. Bispyricbac sodium 10 SC, Metsulfuron methyl 20 WP, Ethoxy sulfuron 15 WDG, Chlorimuron ethyl+Metsulfuron methyl 20 WP, Fenoxyprop p ethyl 9.3 EC and old herbicide 2. 4 D Sodium salt. In addition to that, weed free up to 45 DAT and weedy check are also included to make a comparison. The experiment design was laid out in RCBD with ten treatments and three replication. The results revealed that among herbicide treatments sequential application of Butachlor 50 EC @ 1.25 kg a.i ha^-1 at 3 DAT Fb Bispyricbac sodium 10 SC @ 20 g a.i ha^-1 at 21 DAT significantly recorded lower weed count (22.32 /0.25 m²), weed dry weight (3.08g /0.25 m²), weed index (8.36 %) and higher weed control efficiency (71.16 %) without being phototoxic to the crop and as a result recorded in the higher grain yield (5165 kg ha^-1). However, these results were on par with Butachlor 50 EC @ 1.25 kg a.i ha^-1 at 3 DAT fb hand weeding at 15 and 30 DAT followed by weed free up to 45 DAT (hand weeding).

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