Weed Control

NOTE:  For the herbicides listed below, one product trade name and formulation is provided for each active ingredient (common name) as an example of rates, days to harvest (dh), REI, and special instructions. In many cases there are other products available with the same active ingredient. Please see Table 17 and Alphabetical Listing by Trade Name for more information on products with the same active ingredients. 

Stale Seedbed

glyphosate (Roundup 4S): 1 to 5 pt/A (REI 12h, Group 9). See Stale Seedbed Technique.

paraquat (Gramoxone Inteon* 2S): 2.0 to 4.0 pt/A (REI 12h, Group 22). See Stale Seedbed Technique.

pelargonic acid (Scythe 4.2): 3 to 10 gal/A (REI 24h, Group 27). See Stale Seedbed Technique.

Soil Applied

trifluralin (Trilin 4EC): 1 to 1 1/2 pt/A (REI 12h, Group 3). Incorporate before planting and within six hours of application. Especially effective for annual grass.

clomazone (Command 3ME): 20 oz/A (REI 12h, Group 13). Succulent peas only. Apply after seeding to the soil surface. Will control many broadleaf weeds including common lambsquarters, velvetleaf, and jimsonweed. Some temporary crop injury (partial whitening of leaf or stem tissue) may be visible after crop emergence. Complete recovery will occur from minor early injury without affecting yield or earliness. See label for replanting restrictions.

Postemergence

clethodim (Select 2EC):  6 to 8 oz/A (20 dh, REI 24h, Group 1).  Apply to actively growing grasses.  See label for grass height and herbicide rate.  Always use a crop oil concentrate at a rate of 1 gal/100 gal spray mix.  See both container label and any supplemental label available from dealer.

bentazon (Basagran 4E): 1 1/2 to 2 pt/A (REI 48h, Group 6). Do not apply until peas have at least three pairs of leaves (or four nodes). Do not add oil to bentazon for use on peas. Do not apply to chick peas (garbanzo beans).

MCPB (Thistrol 2S): 2 to 3 pt/A, (REI 12h, Group 4). Apply post-emergence from pea shoot emergence until about three leaf nodes before flowering. Do not apply later than three nodes before flowering or after pea flower buds appear. Do not apply to peas under stress or if air temperature is greater than 90°F. This treatment is primarily for Canada thistle control. May be tank mixed with bentazon. See label for rates and timings for specific weeds.

pelargonic acid (Scythe 4.2): 3% to 10% (REI 24h, Group 27). Use a 3-5% solution for annual weeds (4-6 oz/gal water), a 5-7% solution for biennial and perennial weeds (6-9 oz/gal water), and 7-10% solution for maximum burndown (9-13 oz/gal water). Delivery rate for boom applications should be 75 to 200 gal spray solution/A; complete coverage of weed foliage is essential. Use a DIRECTED/SHIELDED SPRAY; contact with crop will cause injury. For hand-held equipment, spray to completely wet all weed foliage but not to the point of runoff. Repeat applications as necessary. Tank mixes are allowed with this product. These include tank mixes with glyphosate (Roundup), sulfosate (Touchdown), and residual herbicides. See label for complete details.

sethoxydim (Poast 1.5EC): 1 to 2 pt/A (30 dh for dry peas; 15 dh for succulent peas, REI 12h, Group 1). Apply with crop oil concentrate at 2 pt/A. Apply to actively growing weed grasses (see product label for susceptible stage of growth). Do not cultivate five days prior to or seven days after application.