ONION, SHALLOT, DRY BULB (Seeded, Sets, Transplants)


Weed Problem   Chemical   Pounds Active Ingredient (AI)/Acre   Amount of Commercial Product/Acre   Remarks and Limitations

Emerged weeds before planting   glyphosate
(ROUNDUP 4L)
  2-3  
2-3 qt
  Apply before planting in the spring or after harvest in the fall. Kills carrots and potatoes.

  paraquat
(GRAMOXONE SL 2.0)
  0.5-1  
2-4 pt
  Apply before or after seeding but before crop emerges. Include 1 pt NIS/100 gal. Kills small grains planted for windbreak and any emerged crop plants. 60-day PHI. RUP.

Preemergence seeded   dimethenamid-P
(OUTLOOK 6E)
  0.56-0.98  
12-21 fl oz
  Apply after onion 2-leaf stage. On muck soil use full rate. Yellow nutsedge control. One application/year. 30 day PHI.

  ethofumesate
(NORTRON 4SC)
  0.5-1.0  
1-2 pt
  Apply after planting. Use lower rate on sandy soil. Rain needed to activate chemical. 4-6 weeks control of several grasses and broadleaves on mineral soil. May cause onion stunting in cool weather.

  flumioxazin
(CHATEAU 51WDG)
  0.032-0.064  
1-2 oz
  Apply to 3- to 6-leaf onions. May be mixed with Prowl H2O. Do not tank mix with other herbicides or adjuvants. Maximum 3 oz/acre/year. Controls nightshades, groundsel, mustards, spotted spurge. 45-day PHI. May stunt onions on mineral soil.

  pendimethalin
(PROWL H20 3.8 ACS)
  0.7-1.9  
0.75-2 qt
  MUCK SOIL: Apply 2 qt/acre preemergence and after the 2-leaf stage. Make third application at the 6- to 9- leaf stage. Pack soil well over the row. Wait 5 days after seeding barley to apply. Maximum total of 6.3 qt/acre/year.

MINERAL SOIL: Apply 1.5-3 pt/acre to onions with 2-9 leaves. Maximum 3.2 pt/acre/year. 45-day PHI.

  s-metolachlor
(DUAL MAGNUM 7.62EC)
  0.63-1.26  
0.67-1.33 pt
  Apply after 2-leaf stage of onions. Make second application 3-4 weeks after first. 60-day PHI. Some yellow nutsedge control. See: www.farmassist.com for Michigan 24C indemnified label.

Preemergence transplants   dimethenamid-P
(OUTLOOK 6E)
  0.56 - 0.98  
12 - 21 fl oz
  Pack soil well at transplanting. Apply after soil is settles around the plants. Use high rate on muck soil. Suppresses nutsedge. 30 day PHI.

  ethofumesate
(NORTRON 4SC)
  0.5 - 1  
1 - 2 pt
  Use on mineral soils. Use lower rate on coarse soils. On course soils, do not exceed 48 fl oz total pre- and post-emergence. On medium and fine soils, do not exceed 96 fl oz/year.

  oxyfluorfen
(GOALTENDER 4SC)
  0.25  
8 fl oz
  Apply within 2 days of transplanting. Greenhouse-grown transplants may be sensitive to GoalTender at transplanting. Do not exceed 1 pt/acre/year total pre- and post-emergence.

  pendimethalin
(PROWL H20 3.8 ACS)
  0.7 - 1.9  
0.75 - 2 qt
  Apply after transplanting and after the 2-leaf stage. Pack soil around plants at planting before application.

Postemergence broadleaves   bromoxynil
(MOXY 2E)
  0.13-0.25  
8-16 fl oz
  Apply before onions emerge or to onions with 2-5 leaves. Application to younger or older onions may cause crop injury. Apply in a minimum of 50 gal water/acre, after 2 sunny days, when soil and onion leaves are dry and temperature is 70-80 F to avoid crop injury. Controls mustards, lambsquarters and smartweed.

  ethofumesate
(NORTRON 4SC)
  0.5  
1 pt
  Apply to small broadleaves and nutsedge. Maximum 4 applications/year. Controls chickweed, nightshades, pigweed, nutsedge. 30-day PHI.

  fluroxypyr
(STARANE ULTRA 2.8 L)
  0.123  
0.35 pt
  Apply to onions with 2-6 leaves. Maximum of 2 applications per season. Controls volunteer potato, chickweed, composites, nightshades, mustards. SLN.

  oxyfluorfen
(GOALTENDER 4SC)
  0.063-0.123  
2-4 fl oz
  Apply as broadcast spray during sunny weather after onion 1-leaf stage. Use higher rate for large weeds. May cause foliar injury during cool weather. Do not exceed 16 fl oz/acre/year. 45-day PHI.

Postemergence grasses   clethodim
(SELECT MAX 0.97E)
  0.068-0.12  
9-16 fl oz
  Apply to actively growing grasses. Include 0.25% NIS/acre. Maximum 64 fl oz/acre/year. 45-day PHI.

  fluazifop-P
(FUSILADE DX 2E)
  0.16-0.19  
10-12 fl oz
  Apply to small, actively growing grasses. Include 1 qt COC or 1 pt NIS/acre. Maximum of 48 fl oz/acre/year. 45-day PHI.

  sethoxydim
(POAST 1.5E)
  0.19-0.28  
1-1.5 pt
  Apply to actively growing grasses. Include 1 qt COC/acre. Maximum total of 4.5 pt/acre. 30-day PHI.

ONION, GREEN


Weed Problem   Chemical   Pounds Active Ingredient (AI)/Acre   Amount of Commercial Product/Acre   Remarks and Limitations

Preemergence   dimethenamid-P
(OUTLOOK 6E)
  0.65-0.98  
14-21 fl oz
  Apply after the 2 leaf stage of seeded onions. Use lower rate on light soil. 30 day PHI. See www.farmassist.com to obtain label.

  pendimethalin
(PROWL H20 3.8 ACS)
  0.95-1.9  
2-4 pt
  GREEN ONION AND GREEN SHALLOT. Apply preemergence or at the onion 2-3 leaf stage to control annual grasses and weeds. Emerged weeds will not be controlled. No activity against composites or mustards. Maximum 4 pt/acre/year. 30-day PHI. Use 3-4 pt/acre pre on high-organic soil. MI 24c label.

  s-metolachlor
(DUAL MAGNUM 7.62EC)
  0.63-1.26  
0.67-1.33 pt
  Apply at the onion 2-leaf stage. Use lowest rate on light sandy soils. No effect on emerged weeds. 21-day PHI. See: www.farmassist.com for Michigan 24C indemnified label.

Postemergence grasses   clethodim
(SELECT MAX 0.97E)
  0.093-0.125  
6-8 fl oz
  Apply to small grasses. Use high rate for annual bluegrass control. Add an adjuvant. 14-day PHI.

  sethoxydim
(POAST 1.5E)
  0.19-0.28  
1-1.5 pt
  Apply to actively growing grasses. Include 1 qt COC per acre. Maximum total of 4.5 pt/acre. 30-day PHI.