You’re walking your fields, and you come across a weed that you know you’ve seen before. But you can’t call the name.

Friend, if that’s happened to you this spring or even in the last year or two, you need to download the new Ag Weed ID on your mobile phone. This free app, which is powered by Penton Farm Progress, can be invaluable in helping you ID and control problem weeds this spring.

The Ag Weed Id app displays multiple images of about 75 of the most common weeds found in corn, cotton, rice, grain sorghum, soybeans and wheat. It also enables growers to select weeds from their state, their crop and the current season.

“This app is geared to producers who already know what their problem weeds are, but might need help identifying a new species or recalling the name of a weed they don’t see all the time,” said Greg Frey, vice president for Penton Farm Progress. “Growers know that applying the right herbicide for the right weed is critical, and this can help meet that challenge.”

Users can use the image library on the app to help identify weeds or they can take a photo of the weed with their phone and compare what’s in their field with the images in the library. Photos can be uploaded by mobile phone or tablet device to Extension agents or crop consultants and bookmarked for later reference or shared via email, Facebook or Twitter.

The landing page for the app gives users the option of browsing the weed images or comparing images with a photo of the weed on their phone. From there, users can select the season, their location, the crop and whether the weed is a broadleaf or grass.

In April, an Arkansas rice producer would have seven weeds to choose from: Blue Mudplantain, ladysthumb, longleaf pondweed, naiads, redtsem, tumble mustard (aka London rocket) and waterhyssop. An Arkansas corn farmer, meanwhile, would have eight weeds: Canada thistle, common milkweed, common ragweed, field bindweed, Indian hemp, tumble mustard, velvetleaf and wild buckwheat.

Download the Ag Weed ID app on iTunes now. The android version will be available soon. If you have questions, contact Forrest Laws, content director, Farm Press,