Weed Control J 2025; 24: e202500878

ISSUE Cover

Time available for absorption of glyphosate formulations and the control of Urochloa plantaggnea

DOI: 10.7824/wcj.2025;24:00878

Abstract:

Introduction:

Urochloa plantaginea is a weed species characterized by rapid growth, high water use efficiency, and a strong ability to extract nutrients from the soil. As such, it can reduce the photosynthetic capacity of crops during early development stages and negatively impact their productivity.

Objective:

To evaluate the effect of time on the absorption of spray solutions of glyphosate-based herbicide formulations in the non-treated parts of U. plantaginea plants.

Methods:

A completely randomized experimental design was used in a 6×5 factorial scheme with five replications. The first factor consisted of the spray solutions (Crucial®, Roundup Original® Mais, Roundup Transorb® R, Roundup WG®, Roundup Ultra®, and Zapp Qi 620), and the second factor was the length of time the treated leaves remained on the U. plantaginea plant (30, 60, 120, 240 and 480 minutes).

Results:

Roundup Transorb® R was the herbicide that provided the highest coverage, at 63.8%, while Roundup Original® Mais and Crucial® resulted in the lowest coverage. A minimum time of 120 minutes before removing the treated leaf was sufficient for the herbicide Zapp QI 620 to be absorbed effectively, resulting in 52% phytotoxicity.

Conclusions:

The time intervals used were sufficient for the absorption of glyphosate-based herbicide spray solutions from the treated leaf to the rest of the plant. Zapp QI 620 was the most effective herbicide at 28 days after application (DAA), achieving 52% control of U. plantaginea plants.