Evaluation of bispyribac-sodium for weed control in rainfed rice.
DOI:
https://doi.org/10.15517/am.v15i1.11922Abstract
Two experiments were established in Los
Naranjos, Veracruz, México to evaluate the weed control
efficacy of the postemergence herbicide bispyribac-sodium,
alone and in mixture with other herbicides in rainfed rice and
to evaluate the toxicity of bispyribac-sodium to rice. An
experiment was established on June 13, 1999, and the second
on June 9, 2000 with rice cv Milagro Filipino at 100 kg/ha. A
randomized complete block design with eight treatments and
the second six with four replication each one was established.
In 1999, weed control was evaluated at 15, 30 and 105 days
after application (DAA) and in 2000, at 15, 30 and 45 DAA.
In both experiments, toxicity was evaluated at 15 and 30
DAA. The main weed species were junglerice [Echinochloa
colona (L.) Link.], flatsedge (Cyperus iria L.) and Southern
crabgrass [Digitaria ciliaris (Retz.) Koel]. Bispyribacsodium
affected only emerged plants; this herbicide
efficiently controlled flatsedge at 15 g/ha, junglerice at 22
g/ha and Southern crabgrass was only partially controlled.
When bispyribac-sodium was mixed with clomazone or
thiobencarb, grass control was increased and a residual
herbicide effect was obtained. Bispyribac-sodium was highly
selective to rice.
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