Home Crop Monitoring Corn School: How to count leaves for herbicide timing

Corn School: How to count leaves for herbicide timing


Correct staging is important when making use of in-crop herbicides in corn, however there are a number of methods to measure corn’s development phases, and herbicide labels don’t all the time use the identical technique.

Agronomists usually use the “leaf collar” — or V-stage — technique to describe development phases, whereas others use plant top. Nevertheless, herbicide labels usually refer to barely completely different strategies that contain counting leaves.

Many product labels use both the “leaf over” technique or the “leaf tip” technique, explains Jeanette Gaultier, senior technical providers specialist with BASF, on this episode of Corn College.

As she demonstrates within the video beneath, the leaf over technique includes counting the variety of leaves, ranging from the coleoptile leaf with the rounded tip on the backside of the plant, to the final leaf that’s bent over, with its tip pointing down. Much less mature leaves which can be nonetheless pointing up should not counted.

For the leaf tip technique, all of the leaves are counted, together with any leaf suggestions pointing up from the whorl on the prime of the plant, explains Gaultier.

The leaf collar technique, in the meantime, includes counting the variety of leaves with seen collars, ranging from the coleoptile all the best way to the final leaf with a visual collar.

Wind, dry situations, frost, and different stressors — all of which have been seen in Western Canada in 2021 — could cause decrease leaves to fall off, however these leaves ought to nonetheless be counted to decide the crop’s physiological stage, notes Gaultier.

Take a look at this Corn College episode with Jeanette Gaultier for extra on corn staging, and weed management methods for corn in Western Canada:


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