Document Type

Article

Publication Date

1-1-2024

Abstract

Tiafenacil is a new nonselective protoporphyrinogen IX oxidase-inhibiting herbicide with both grass and broadleaf activity labeled for preplant application to corn, cotton, soybean, and wheat. Early-season cotton emergence and growth often coincides in the Mid-South with preplant herbicide application in later planted cotton and soybean, thereby increasing opportunity for off-target herbicide movement from adjacent fields. Field studies were conducted in 2022 to identify any deleterious impacts of reduced rates of tiafenacil (12.5 – 0.4% of the lowest labeled application rate of 24.64 g ai ha-1) applied to oneto two-leaf cotton. Visual injury one week after treatment (WAT) with 1/8, 1/16, 1/32, and 1/64x rate of tiafenacil was 72, 54, 36, and 22%, respectively, whereas at four WAT these respective rates resulted in visual injury of 73, 67, 48, and 20%. Tiafenacil at these rates reduced cotton height 26 to 38% and 12 to 36% one and four WAT and seed cotton yield reduced 58, 38, 20, and 9%. Application of tiafenacil directly adjacent to cotton in early vegetative growth should be avoided as severe visual injury will occur. In cases where off-target movement occurs, impacted cotton should not be expected to recover fully and negative impact on growth and yield will be observed.

Publication Source (Journal or Book title)

Journal of Cotton Science

First Page

58

Last Page

64

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