Johnson grass
Tall grass like a wild sorghum, with wide leaves that have a white midrib, a loose purplish seed head and thick white runners underground.
Crops it troubles
How to tell it is a grass
Round, hollow stems with joints, and leaves in two rows. The group decides what kills it, so check the stem and the leaf before you buy a herbicide.
How to keep it out
Plow out the runners in dry weather and leave them to dry in the sun; never let it seed, and do not carry soil with its runners to another field.
How to control it
What to do and which active ingredients work depend on your crop and how old it is. The weed control helper in anee.io gives both, for corn and every other crop it grows in.
Not sure it is this one?
Many weeds look alike. Send a photo to Anee, the smart farm technician in anee.io. She reads it with your crop, its age and the weather, and tells you what it most likely is and what to do first. In Tagalog or English.