These are not controlled by Bispyribac sodium alone or in combination with Bensulfuron.
Dactyloctenium aegyptium and Leptochloa chinensis are problematic weeds in rice, especially under dry seeding. Both the weeds are better controlled by cultural management practices. They are reported to germinate at shallow soil depth (light enhances germination) and consequently deeper burial or mulching reduces seed germination. Chemical control of Dactyloctenium aegyptium in rice may through pre-emergence herbicides like pretilachlor or pendimethalin, while for Leptochloa chinensis higher efficacy of post emergence herbicides with inhibition of acetyl CoA carboxylasev(ACCase), e.g. fenoxaprop-p-ethyl + ethoxysulfuron had been reported. Accordingly, an efficient and cost effective IWM practice needs to be developed. Following literatures may be seen:
http://www.bioone.org/doi/abs/10.1614/WS-08-070.1
http://www.ncbi.nlm.nih.gov/pubmed/22619576
Controlling with PE herbicides would beneficial and most effective, Pretilachlor would be better...
Preemergence application of Pendimethalin can effectively control both the weeds, similarly post emergence application of pyrazosulfuron can control leptochloa. ACC and ALS inhibitors are less effective on Leptochloa. Water management can greatly improve weed management with respect to both the weeds
Pre-emergence herbicide pendimethaline and post post emergence herbicide fenoxaprop-p-ethyle can control L. chinensis.
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