What is Alion®?

Longer-lasting Alion® herbicide provides a unique solution for pre-emergence control of a wide range of grass and broadleaf weeds, including those resistant to glyphosate herbicides, all without compromising crop safety.
See Overview

How does Alion work?

The active ingredient in Alion is a cellulose-biosynthesis inhibitor (CBI) and is classified as a WSSA Group 29 herbicide. Alion contains the most effective CBI herbicide discovered to date and works by affecting cell wall formation, as well as cell elongation and division.
See Labels/MSDS

How long will the residual weed control last?

Field trials across the United States during the last eight years confirm weed control lasting longer than six months with only 5 ounces per acre of Alion herbicide. Alion provided pre-emergent residual control of both grass and broadleaf weeds longer than leading competitive products.

In Florida, two sequential applications of 5 ounces per acre, timed four months apart, will provide season-long control in citrus.

What crops is Alion registered on?

Alion is available for use in citrus, grape, pome and stone fruit, tree nut crops, and olives. 

This herbicide can be used on tree crops established for a minimum of three years (five years for pecans and grapes) after transplanting and exhibiting normal growth and good vigor. In addition, it can be applied to citrus trees established for a minimum of one year after transplanting, unless allowed under specific local label.
See Registered Crops

What weeds does Alion control?

Alion controls a broad spectrum of grass and broadleaf weeds, including those resistant to other herbicide classes, such as ACC-ase, ALS, triazine and glyphosate-resistant weeds. For a complete list of weeds controlled, refer to Alion website the Alion label.
See All Pests

What is the use rate?

Alion should be applied at 3.5 to 6.5 ounces per acre, with a season maximum of 10.3 ounces per acre per year.
See Use & Mixing

How much rainfall is required for Alion to be incorporated into the soil?

Alion can be incorporated with as little as 0.25 inches of rainfall or irrigation. In some cases, such as extremely dry, fine-textured soil, additional moisture may be necessary for optimum performance.

When should Alion be applied?

Alion can be applied anytime up to 14 days prior to harvest on all crops other than citrus, which requires a pre-harvest interval of seven days. Best performance occurs when applied prior to rain or irrigation to a dry soil surface followed by 48 hours without irrigation, and before weed emergence. When weeds are up, it is recommended to add a post emergence product such as Rely® 280.

When making more than one application per year, allow a minimum of 90 days between applications.

How does Alion fit into a resistance management plan?

The unique active ingredient available in Alion herbicide presents an excellent weed control option for a variety of reasons. There are currently no documented cases of resistance to CBI chemistries in the United States.

In the same way fruit and tree nut producers are familiar with managing disease and insect pressure, good weed stewardship practices enable growers to prevent, manage or delay the spread of weed resistance and protect useful technologies. Respect the Rotation™ is an initiative to elevate the importance of herbicide mode of action (MOA) rotation, which is essential to improve weed resistance management. Rotate modes of action and use multiple MOAs to reduce the selection pressure caused by overusing a single MOA.

Are there crop rotation restrictions?

Only crops listed on the label may be replanted or rotated within 24 months after the last application of Alion herbicide and while following the instructions listed in the "Rotational Crop Restrictions" section.

Alion is intended for use in perennial tree crops listed on the label and for non-crop farmstead uses. Do not rotate to any crops not listed on the label within 24 months after the last application. Planting earlier than this may result in crop injury.

Refer to the Alion label for more detailed information.


View all labels / MSDS

Learn about our community outreach programs and educational initiatives. » more
Find innovative solutions that keep your citrus crops safe from start to finish.  » more
Copyright © Bayer CropScience