Postemergence Herbicide Applications

Posted: November 4, 2011

On Tuesday morning, June 28, 2011 at 5:00 am, Sandea (halosulfuron-methyl) herbicide was applied postemergence on fields of pepper and cantaloupe growing in research plots at the Horticulture Research Farm, Rock Springs, PA. Sandea is labeled for application on both peppers and cantaloupes for weed control.
Sandia herbicide injury on cantelope. Photo Mike Orzoleck.

Sandia herbicide injury on cantelope. Photo Mike Orzoleck.

Normally, you will not observe any significant injury to cantaloupe or pepper plants with a Sandea application at the labeled rate. However, Tuesday morning was cool (50’s°F) with heavy dew. I think the combination of cool temperatures and heavy dew early in the morning resulted in injury to the cantaloupe plants that I have not observed before. Based on this experience, I will not apply Sandea in the field on cool, dewy mornings. See photos for typical injury symptoms that were observed on the cantaloupe variety trial plants 48 hours after Sandea application.