Vol. 1 No. 2
Effect of pre and post emergence herbicides on Echinochloa spp. control in rice nursery.
Author(s): A.S. Rao
Abstract: A field experiment was conducted during Kharif 2003 and 2004 to study the effect of some new pre and post emergence herbicides on Echinochloa spp. control in rice nursery. Results revealed that all the herbicides significantly controlled Echinochloa spp over unweeded check. Among the herbicides, post emergence application of cyhalofopbutyl 100gha -1 applied at 14 days after sowing (DAS) effectively controlled Echinochloa spp, without any phytotoxicity to rice, where as the pre emergence herbicide pretilachlor 500gha-1 + safener and post emergence herbicides fenoxaprop-p-ethyl 56 gha-1 and clodinafop propargyl 53 gha-1 caused initial injury to rice, but crop recovered by 30 DAS. Application of post emergence herbicides recorded higher weed control efficiency (WCE) of 85 to 89 percent and was found to the superior to pre emergence herbicides (pretilachlor 500g ha-1 + safener pyrazosulfuron ethyl 20gha-1 and oxadiargyl 80gha-1 ) which recorded WCE of 66 to 69 percent at 30 DAS.
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