Dow AgroSciences’ Trellis herbicide received EPA and California registration

Dow AgroSciences received registration from the U.S. EPA and California Department of Pesticide Regulation for Trellis herbicide in grapes and tree nuts.

The active ingredient in Trellis is isoxaben, the same active ingredient in Gallery® T&V herbicide. Gallery, also manufactured by Dow AgroSciences, has been registered for non-bearing trees and vines since 1998, and has been widely-used for broadleaf weed control since its registration.

Trellis will replace Gallery T&V starting this fall, and will be labeled for use in bearing and non-bearing tree nuts and grapes, as well as non-bearing stone and pome crops.

Trellis provides pre-emergence control of 92 weeds — mostly broadleaves — including fleabane, marestail, malva, clover, morningglory and willowherb.

"In the last 13 years, there have been significant orchard and vineyard acres treated with isoxaben,” says Debbie Shatley, Dow AgroSciences field scientist. "This molecule has given growers with new plantings the ability to control a broad spectrum of weeds with no adverse effects on the crops. In terms of crop safety, isoxaben has proven to be one of the safest herbicides available for non-bearing trees and grapes.”

Trellis belongs to the benzamide herbicide family (WSSA Group 21). That family, along with its mode of action, is unique to grapes. “Trellis is the only herbicide used in grapes that uses a cellulose biosynthesis inhibitor (CBI) mode of action. Most commonly-used herbicides in these crops are PPOs, DNAs and ALS-inhibitors. Trellis will be an integral part of weed resistance management programs, such as those used in vineyards exhibiting glyphosate resistance.”

As a strictly pre-emergent herbicide, Trellis will not control existing weeds. While Trellis can be tank mixed with other grass and contact herbicides for more complete weed control, applications are best made to bare ground with limited weeds and leaves on the ground.