44769*Envoy Plus, others
Common Name: clethodim
Formulation: 0.97EC
Uses: Selective postemergence control of annual and perennial grass weeds in conifer trees, non-bearing food crops, ornamentals, and noncrop areas. Can be used in Christmas tree farms, conifer nurseries, greenhouses, shadehouses, and around outdoor ornamentals including nurseries, parks, roadside plantings, and structure landscapes.
| Amount of active ingredient | Amount by formulation |
| | 0.97EC |
Per Acre | 0.06 to 0.25 lb. | 9 to 32 fl. oz. |
Per 1,000 sq. ft. | | 0.2 to 0.7 fl. oz. |
NOTE: Application on Long Island, New York is restricted to no more than 32 fl. oz. of *Envoy Plus (0.25 lb. AI) per acre per season.
Major Weeds Controlled: Many annual and some perennial grasses such as barnyardgrass, crabgrass, foxtails, bermudagrass, johnsongrass, and quackgrass. Annual bluegrass (Poa annua) is well controlled.
Major Weeds Not Controlled: Sedges and broadleaf weeds.
For Best Results: Apply to actively growing grasses that are not under environmental stress. Consult label for appropriate application method and timing for perennial grass control. Use nonionic surfactant only.
Cautions and Precautions: Unsatisfactory control may result if grasses are stressed or if grasses are not at the correct growth stage at the time of application. Do not cultivate treated grasses seven days before or seven days after application or control may be reduced. Do not apply a broadleaf herbicide within one day following application. Do not apply if rainfall is expected within one hour of application. Do not apply more than 0.5 lb AI per acre per season (and no more than 0.25 lb AI per acre per season on Long Island, New York). Sugar maples cannot be tapped for syrup within one year of application. Repeated use of postemergence grass herbicides with the same mode of action may lead to selection of resistant biotypes. See label for list of species in which foliar or flower speckling has been observed.
Residual Activity: No residual activity.
Volatility and Leaching Potential: Little volatility. Clethodim is rapidly degraded through activity of microbes and exposure to sunlight. The chemical is only slightly adsorbed and has the potential to leach, but degradation is very rapid so the actual amount of leaching is probably slight.
Symptoms and Mode of Action: Slow-acting herbicide; requires 7 to 14 days for control. Inhibits acetyl coenzyme A carboxylase, an important enzyme for many biosynthetic pathways. Classified as Group 1 Herbicide.
Manufacturer: Valent USA Corporation
EPA Reg. No.: 59639-132
* Restricted use pesticide.