01988naa a2200241 a 450000100080000000500110000800800410001910000170006024501510007726000090022852012530023765300250149065300210151565300250153665300170156165300120157865300220159070000180161270000140163070000180164470000200166277300640168211248732016-02-24       2015    bl uuuu     u00u1 u    #d1 aMOURA, D. S.  aMULTIPLE RESISTANCE OF Sagittaria montevidensis BIOTYPES TO ACETOLACTATE SYNTHASE AND PHOTOSYSTEM II INHIBITING HERBICIDES.h[electronic resource]  c2015  aThe objective of this research was to evaluate the occurance of multiple resistance of Sagittaria montevidensis (SAGMO) biotypes to acetolactate synthase (ALS) and photosystem II (PSII) inhibiting herbicides through dose-response experiments. The experiment was conducted in a greenhouse from October 2012 to March 2013, in Pelotas, RS. The experimental design was completely randomized, with four replications. Treatments were arranged in a triple factorial design: two biotypes of S. montevidensis (SAGMO 35 ? susceptible to herbicides and SAGMO 32 ? suspected to be multiple resistance to ALS and PSII inhibiting herbicides), four herbicides (penoxsulam, (imazethapyr+imazapic), bentazon and saflufenacil) and 8 rates of these herbicides (1/32x, 1/16x, 1/8x, 1/4x, 1/2x, 0x, 1x, 2x, 4x, 8x, 16x, 32x and 64x). SAGMO 32 biotype presented high levels of resistance to penoxsulam, (imazethapyr+imazapic) and bentazon. For a 50% reduction in dry matter of the resistant biotype rate of 138 and 2.46 times higher than the label required for the susceptible biotype of the herbicides (imazethapyr+imazapic) and bentazon, respectively, are required. Saflufenacil may be used successfully to control Sagittaria montevidensis resistant in irrigated rice.  aCalifornia arrowhead  achemical control  aherbicide resistance  aOryza sativa  aRicer??  awater-seeded rice1 aNOLDIN, J. A.1 aGALON, L.1 aSCHREIBER, F.1 aBASTIANI, M. O.  tPlanta Daninha, Vi??osa, MGgv. 33, n. 4, p. 779-786, 2015.