Weed Management Handbook

Biology and management Wild proso millet mimics sweet corn growth. Seeds mature before corn harvest, facilitating spread with machinery. Seed longevity in soil, however, is relatively short (3 to 5 years). Rotating to grass seed or summer annual broadleaf crops helps deplete the seedbank if wild proso millet is not allowed to produce seed. Wild proso millet seedlings emerge erratically throughout the season because of inherent seed dormancy, which is strongest for black-seed types.

atrazine

Rate Maximum 2 lb ai/year

Time Apply in fall or preferably spring either as a single application at higher rates 1 to 3 weeks before plowing to actively growing quackgrass or as a split treatment, first before plowing and second before, during, or after planting, before weeds are 1.5 inches tall.

2,4-D amine

Rate 0.24 to 0.71 lb ae/A (0.5 to 1.5 pints/A product)

Time Apply after corn is tall enough to use drop nozzles between rows.

Remarks To avoid drift injury, use the same precautions in spraying 2,4-D as for winter cereals. Avoid contact with corn foliage to reduce brittle stalks and whorl distortion that prevents tassel emergence. Mimics natural plant hormones.

dimethenamid-P (Outlook)

Rate 0.56 to 0.98 lb ai/A (12 to 21 fl oz /A Outlook)

Time Early postemergence on corn up to 12 inches tall.

acetochlor (Surpass or Cadence)

Rate 0.8 to 3 lb ai/A. Consult appropriate label for rates.

Time Apply preplant or preemergence.

atrazine

Rate Consult label.

Time Apply as a single application or split applications according to one of six alternative methods listed on label.

Remarks Yearly applications or use of other herbicides can reduce populations if a few plants survive growing season.

The purpose of combining herbicides is to exploit the strong properties of each herbicide while minimizing any weaknesses or undesirable properties. By combining herbicides at reduced rates, the grower can increase the spectrum of annual weeds controlled while reducing herbicide carryover. See label concerning the herbicides in use.

clethodim (Select Max, Select Max, Clethodim 2E, Tide USA Clethodim 2EC, Willowood Clethodim 2EC, Shadow, Shadow 3EC, Cleanse)

Burndown of volunteer Round up Ready corn before re-planting corn

Rate 0.047 lb ai/A or 0.0455 lb ai/A (3 fl oz/A for Clethodim 2E or 6 fl oz/A for Select Max)

Time Up to 6 days before planting corn.

bentazon (Basagran, Bentazon 4)

Rate 0.75 to 1 lb ai/A

Time Apply when yellow nutsedge is 6 to 8 inches tall and, if needed, again at the same rate 7 to 10 days later.

glyphosate (several trade names)

Rate 0.75 to 3.75 lb ae/A

Time Apply to actively growing weeds before silking of corn.

Remarks Rates depend on weed species and growth stage as specified on label.