Effect of cyhalofop-butyl for annual grass weed control in rain-fed rice.
DOI:
https://doi.org/10.15517/am.v15i2.11897Keywords:
grass weeds, rainfed rice, cyhalofop-butyl, chemical control, Echinochloa colona, Digitaria ciliaris.Abstract
In 2002, two experiments were
carried out in the municipality of Tres Valles, Ver., Mexico, in
order to evaluate the effectiveness of cyhalofop-butyl on the
annual grass weed control in rain-fed rice cv Milagro
Filipino. A randomized complete block design with seven
treatments and four replications was utilized for both
experiments. Cyhalofop-butyl was evaluated at 180, 225,
270, 315 y 360 g/ha, propanil at 4320 g/ha and a weedy check
were also included. The treatments were applied when the
rice plants had a height of 25 cm. Annual grass weeds present
in the experiments, were junglerice and Southern crabgrass
[Digitaria ciliaris (Retz.) Koeler]. Grass weed control and
toxicity to rice were evaluated at 15, 30 and 45 days after
application. The highest junglerice and Southern crabgrass
controls were obtained when cyhalofop-butyl was applied at
315 and 360 g/ha. The different dosages of this herbicide, did
not cause any toxicity to rice. The effect of propanil on weeds
was similar to that of cyhalofop-butyl at 360 g/ha during the
first 15 days after application.
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