Chateau herbicide has drawn attention this year for its control of annual morning glory in blackeye bean trials at the University of California’s Shafter Station, according to Kurt Hembree, Fresno County farm advisor.

Although Chateau, a Valent product whose active ingredient is flumioxazin, is not registered for use on dry beans in California, Hembree said data gathered in this and future trials could help it gain registration for that purpose.

“At this point it looks like a double-hit with Chateau may be a good strategy against morning glory, and we need to get Prowl or something else into the program to get the grasses,” he said during a recent blackeye field day at the Shafter site.

Annual morning glory, whose dense foliage dotted with blue flowers can engulf a stand of blackeyes, is more common in Kern County than the northern part of the San Joaquin Valley. It is particularly difficult to control once its stems develop.

Among his various treatments this season, Hembree said he got best results by applying Chateau, first postplant preemergence and then postemergence directed after the second irrigation, on the blackeye plot for burndown and residual activity against the weed.

He said applying the postemergence directed treatment after the first irrigation and before vines closed may have been even better.

He plans to continue the trials next year, comparing timing of a postemergence directed spray after the first irrigation with one made after the second irrigation.

Hembree pointed out that while the Chateau applications were successful on blackeyes, they were not so in his trials with garbanzos, which showed high sensitivity to the material.

His trials on blackeyes this year at the Kearney Agricultural Center at Parlier also indicated good prospects for Outlook, a dimethenamid material from BASF that is strong against nutsedge and nightshade but not harmful to the crop. It is registered for dry beans elsewhere but not in California.