|Weed Control - 88
Project Leader and Principal UC Investigators
David Bayer,professor, Department of Botany, UC Davis
Jim Hill, Extension agronomist, Dept. of Agronomy and Range Science, UC Davis
Tests of the experimental herbicide Londax®, as in previous years, showed encouraging results on broadleaf weeds.
Londax® gave effective control of roughseed bullrush, smallflower umbrellaplant, redstem and arrowhead at any time between the twoleaf and the well-tillered stage of plant growth. Barnyardgrass was partially controlled by Londax® at higher rates and later timings; ducksalad was not controlled with later applications. For most broadleaf weeds, control was adequate at 1 ounce per acre.
Combinations of Londax® with Ordram®, Bolero® or Basagran® controlled both grass and broadleaf weeds as well as current methods.
Facet again showed some promise for watergrass control at 0.05 to 1 pound/acre, but results were variable. Several new herbicides were evaluated for weed control and crop injury under California conditions.
These herbicide trials provided new evidence that proper timing of herbicide application is crucial. The researchers reported: "The rice must be well established and the weeds must be large enough for proper coverage by the herbicide. But once rapid tillering or flowering is reached, herbicide efficacy diminishes and good weed control is lost."
Other experiments were aimed at better integrated pest management and better understanding of rice weed biology. Among the findings: