Vol. 17 No. 1
Evaluation of imazethapyr and its ready mix combinations for weed control in okra (Abelmoschus esculentus (L.) Moench)
Author(s): R. SINGH, D. R. CHAUDHARY AND S. S. RANA
Abstract: The bio-efficiency of imazethapyr and its ready mix combination with imazamox against weeds, their effect on growth, development and yield of okra crop were studied at Palampur during kharif 2016. The major weed flora of the experimental field was composed of Echinochloa colona, Panicum dichotomiflorum, Gallinsoga parviflora, Commelina benghalensis and Cyperus rotundus constituting 7.4, 13.1, 14.1, 27.1 and 34.6 per cent, respectively. Hand weeding twice had lower count of Cyperus rotundus. Pendimethalin 1000 g ha-1 (pre-emergence) fb hand weeding (HW) (30 DAS) and pendimethalin 1500 g ha-1, hand weeding twice (30 and 45 DAS), pendimethalin 1500 g ha-1 and pendimethalin 1000 g ha-1 fb imazethapyr + imazamox 60 g ha-1 (post-emergence) was significantly superior to other treatments in reducing the count of Commelina benghalensis upto 90 days after sowing (DAS).Pendimethalin 1000 g ha-1 (pre-emergence) fb hand weeding (HW) at 30 days after sowing (DAS), hand weeding and pendimethalin 1500 g ha-1 effectively controlled Gallinsoga parviflora. Pendimethalin1000 g ha-1 (pre-emergence) fb hand weeding (HW) at 30 (DAS) had the lowest population of Panicum dichotomiflorum. Pendimethalin 1000 g ha-1 (pre-emergence) fb hand weeding at 30 (DAS), pendimethalin 1500 g ha-1 (pre-emergence) and hand weeding (30&45 DAS) resulted in significantly lower total weed count. Pendimethalin 1000 g ha-1 (pre) fb hand weeding (30 DAS), hand weeding (30 and 45 DAS) and pendimethalin 1500 g ha-1 (pre) alone produced taller plants of okra compared to other treatments. Treatments having imazethapyr as a part significantly reduced the plant height probably owing to phytotoxicity. Hand weeding (30 and 45 DAS), pendimethalin (pre) 1000 g ha-1 fb hand weeding (30 DAS) and pendimethalin (pre) 1500 g ha-1 alone were earlier in days to 50% flowering and days to first picking. Phytotoxicity induced by imazethapyr resulted in significantly lower final plant stand in the treatments constituting of it. Pendimethalin (pre) 1000 g ha-1 fb hand weeding (30DAS) and pendimethalin (pre) 1500 g ha-1 alone had more number of fruits/plant than other treatments. Pendimethalin 1000 g ha-1 (pre) fb hand weeding (30 DAS) remaining at par with imazethapyr + pendimethalin 1200 g ha-1 (pre) and pendimethalin 1500 g ha-1 (pre) alone resulted in significantly higher fresh fruit yield/plant and fruit yield per hectare over the other weed control treatments. The fresh fruit yield per plant under weedy check was only 18% of that under pendimethalin 1000 g ha-1 (pre-emergence) fb hand weeding indicating.
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