{"id":713,"date":"2021-12-02T07:56:55","date_gmt":"2021-12-02T15:56:55","guid":{"rendered":"http:\/\/smallgrains.wsu.edu\/weeders-of-the-west\/?p=713"},"modified":"2022-01-11T09:51:30","modified_gmt":"2022-01-11T17:51:30","slug":"tiafenacil-a-new-herbicide-in-grapes","status":"publish","type":"post","link":"https:\/\/smallgrains.wsu.edu\/weeders-of-the-west\/2021\/12\/02\/tiafenacil-a-new-herbicide-in-grapes\/","title":{"rendered":"Tiafenacil, A New Herbicide in Grapes"},"content":{"rendered":"

Tiafenacil (Gamma, Helm Agro) is now labeled in wine grapes in Oregon, Washington, and Idaho.\u00a0 Tiafenacil is a non-selective postemergence herbicide controlling broadleaves and grasses. It is a new group 14 herbicide, PPO inhibitor, in the N-phenyl-imides chemical family. It is a contact herbicide that provides fast-acting control of weeds and degrades rapidly in the soil. Tiafenacil was developed as a paraquat alternative in Korea.<\/p>\n

Tiafenacil (Gamma) is labeled for basal-direct applications in grapes. Recommended rates are 0.5 to 1.5 oz\/A of Gamma. For best performance, the adjuvants crop oil or methylated seed oil must be used and ammonium sulfate.<\/p>\n

Weeds controlled<\/h2>\n

Most annual broadleaves were controlled when treated at less than 5 inches tall. Suppression of Canada thistle was also noted, but plants recovered after treatment. Grasses controlled include Italian ryegrass<\/a> (<5 inches), annual bluegrass, and other annual grasses. In our studies, higher rates are needed for grass control. Tiafeancil can be tank-mixed with a variety of herbicides. We noticed the best performance when mixing with glufosinate or glyphosate.<\/p><\/div>\n<\/div>\n<\/div><\/div>\n

\"\"<\/p><\/div>\n<\/div>\n

\"\"<\/p><\/div>\n<\/div>\n<\/div><\/div>\n

Figure 1. Weed response to tiafeancil (Gamma) in research vineyard in Oregon. Nontreated control plots left, and tiafenacil (Gamma 0.5 oz\/A) on the right 14 days after treatment.<\/em><\/p>\n

Application Timing<\/h2>\n

Tiafenacil can be used during the dormant or non-dormant season. The pre-harvest interval is 7 days. The maximum use rate per season is 4.5 oz of Gamma per acre per season and cannot be retreated within 14 days. Only vineyards established for 2 years or more can be treated with tiafenacil.<\/p>\n

Remarks<\/h2>\n

My research work was done in silt-loam soils of Oregon, and it is wise to test lower rates in coarser soils to avoid crop injury.<\/p><\/div>\n<\/div>\n<\/div><\/div>\n<\/p>\n","protected":false},"excerpt":{"rendered":"

Tiafenacil (Gamma, Helm Agro) is now labeled in wine grapes in Oregon, Washington, and Idaho.\u00a0 Tiafenacil is a non-selective postemergence herbicide controlling broadleaves and grasses. It is a new group 14 herbicide, PPO inhibitor, in…<\/p>\n","protected":false},"author":4509,"featured_media":595,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"_links":{"self":[{"href":"https:\/\/smallgrains.wsu.edu\/weeders-of-the-west\/wp-json\/wp\/v2\/posts\/713"}],"collection":[{"href":"https:\/\/smallgrains.wsu.edu\/weeders-of-the-west\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/smallgrains.wsu.edu\/weeders-of-the-west\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/smallgrains.wsu.edu\/weeders-of-the-west\/wp-json\/wp\/v2\/users\/4509"}],"replies":[{"embeddable":true,"href":"https:\/\/smallgrains.wsu.edu\/weeders-of-the-west\/wp-json\/wp\/v2\/comments?post=713"}],"version-history":[{"count":5,"href":"https:\/\/smallgrains.wsu.edu\/weeders-of-the-west\/wp-json\/wp\/v2\/posts\/713\/revisions"}],"predecessor-version":[{"id":735,"href":"https:\/\/smallgrains.wsu.edu\/weeders-of-the-west\/wp-json\/wp\/v2\/posts\/713\/revisions\/735"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/smallgrains.wsu.edu\/weeders-of-the-west\/wp-json\/wp\/v2\/media\/595"}],"wp:attachment":[{"href":"https:\/\/smallgrains.wsu.edu\/weeders-of-the-west\/wp-json\/wp\/v2\/media?parent=713"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/smallgrains.wsu.edu\/weeders-of-the-west\/wp-json\/wp\/v2\/categories?post=713"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/smallgrains.wsu.edu\/weeders-of-the-west\/wp-json\/wp\/v2\/tags?post=713"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}