Postemergence Layby Treatments

DCPA (Dacthal W-75)

Melons (all types) only

Rate 4.5 to 10.5 lb ai/a (6 to14 lb/a Dacthal W-75)

Time Apply after plants have four to five true leaves, after cultivation and weeding but before any new weeds become established.

Remarks Performs poorly in western Oregon and Washington. Results improve with rain or overhead irrigation immediately after application. Consult label for restrictions on planting sensitive crops within 8 months. Inhibits mitosis.

Site of action Group 3: microtubule assembly inhibitor

Chemical family Phthalic acid

ethalfluralin (Curbit)

Cucumber, pumpkin, summer and winter squash, watermelon

Rate 1.13 to 1.69 lb ai/a (3 to 4.5 pints/a Curbit)

Time Apply in bands between rows after planting or transplanting. Activate with 0.5 inch of irrigation within 2 to 5 days or cultivate soil 1 to 2 inches deep.

Remarks Adjust rates depending on soil textures and organic matter.

Caution Do not graze or apply to wet cloddy soils. Note replanting restrictions on label for sugar beets and red beets. (Inhibits mitosis, primarily in shoots.)

Site of action Group 3: microtubule assembly inhibitor

Chemical family Dinitroaniline

trifluralin (Treflan 4L or HFP)

Rate 0.5 to 1.0 lb ai/a (1 to 2 pints/a product)

Time Apply as a directed spray between rows when crop has three to four true leaves.

Remarks Incorporate 2 to 3 inches deep, using rolling cultivators set to throw soil toward plants in row. Spray only once per year. Consult label for restrictions on planting sensitive crops within 12 months. (Inhibits mitosis, primarily in shoots.)

Site of action Group 3: microtubule assembly inhibitor

Chemical family Dinitroaniline

Edamame

Ed Peachey

Revised March 2020