G. Pardo, A. Marí, S. Fernández-Cavada, C. García-Floria, S. Hernández,
C. Zaragoza y A. Cirujeda
Issue:
111-4 (295-309)
Topic:
Plant Production
Keywords:
Weeds, barnyardgrass, late watergrass early watergrass, smallflower umbrella, sedge, herbicide
resistance
Summary:
Penoxsulam is commonly-used in rice crop in North eastern Spain with excellent control against Echi -
nochloa ssp. and with some effect on Cyperaceae, but it belongs to an herbicide group prone to develop
resistant biotypes. The aim of this work was to test herbicide programmes alternative to penoxsulam
to preserve the efficacy of the few available active ingredients. The work consisted of 6 trials. Located
in three locations during three years (2011-2013). In each trial eight herbicide programmes were applied,
in two replicates distributed randomly in the field. The results showed that, effectively, penoxsulam had a good control on Echinochloa spp. after applying oxadiazon presowing. The best two alternative programmes
to control Echinochloa ssp. and cyperaceous weeds were: (1) oxadiazon presowing followed
by an application of profoxydim at 1-3 leaves stages of the rice and a third treatment until rice tillering
of bentazone + MCPA or halosulfuron-metil and (2) propanil + bispyribac-Na at 1-3 leaves stage of
the rice, a second treatment until rice tillering of bentazone + MCPA controlling both Echinochloa spp.
and cyperaceous weeds. The drawback of this second programme is that bispyribac-Na belongs to the
same mode of action group as penoxsulam although to different chemical families. However, the results
show that it is possible to control the target weeds with several herbicide combinations to prevent
herbicide-resistance appearance.
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