Evaluation of post emergence herbicides on grass weeds in pigeon pea and its bioassay on following crop

A Field experiment was conducted at Agricultural Research Station, Malnoor (UAS, Raichur) during Kharif of 2012–13 and 2013–14 to study the post emergence herbicides on the control of grassy weeds in pigeon pea and its residual effect on the following pigeon pea. The experiment consists of eight treatments viz, propaquizafop 10 EC @ 0.05, 0.062, 0.10 and 0.125 kg/ha, phenoxaprop-p-ethyl 9.3% at 0.10 kg/ha and imazethapyr at 0.075 kg/ha applied at 2 to7 leafstage ofgrassyweeds. These treatments were compared with hand weeding twice at 20 and 40 days after sowing and weedy check. The data revealed that Imazethayr @ 0.075 kg/ha and hand weeding recorded the highest grain yield of 1683 kg/ha and 1521 kg/ha, respectively. The next best treatment was propaquizafop @ 0.062 kg/ha (1372 kg/ha) and further increase in the dose did not had any beneficial effect. These treatments controlled both the monocot weed species, Dinebra retroflexa and Echinochloa colonum very effectively and had no residual effect on the following pigeon pea.