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

Emerged quackgrass and other perennials   glyphosate
2 qt
  Apply to actively growing quackgrass at least 8 inches tall. Wait 3 days before plowing. Heavy stands of rye will reduce quackgrass control.

Preemergence   fomesafen
1 pt
  Broadcast after planting potatoes and before emergence. Potato varieties may vary in their tolerance of Reflex. Max. of 1 pt/acre/year. Use only once in 2 yrs to any field. 70 day PHI.

1.5-3 lbq
  Apply in tank mix with a grass herbicide. Apply before potatoes emerge but after weeds have emerged. Use low rate on soil with 1-2% OM.

Preemergence annual grasses and broadleaves   dimethenamid-P
12-21 fl oz
  Apply preemergence after drag-off. One application per year. Supresses eastern black nightshade and yellow nutsedge. 40 day PHI.

2.3-3.4 qt
  Incorp. 3 inches deep immediately after application. Use high rate for nutsedge and quackgrass. Not effective on muck soils. Follow with delayed preemerge application of linuron or metrlbuzin.

(PROWL H20 3.8 ACS)
1.5 pt
  Apply soon after planting. Needs rain within 7 days to activate. Follow with a delayed preemergence application of linuron or metribuzin.

1-2 pt
  Apply soon after planting. Follow with delayed preemerge application of linuron or metrlbuzin. May apply to emerged potatoes. 40-day PHI.

Delayed preemergence broadleaves and grasses   metrlbuzin
0.67 lb
  Follow preemergence treatments listed above. Apply just before potatoes emerge and after weeds have emerged but are less than 1 inch tall. Do not use on Atlantic or Shepody varieties.

1.5 oz
  Apply after hilling or drag-off before potatoes and weeds emerge. Needs moisture for activation. 60-day PHI.

Postemergence broadleaves and grasses   metrlbuzin
0.33 lb
  Apply postemergence over the top of potatoes. Avoid spraying during the 12- to 15-inch stage to avoid injury. Do not apply after 3 cool, cloudy days. Do not use on early maturing or red skin varieties. Do not apply within 1 day of other pesticides. Do not apply more than 1 lb ai/acre/year. Do not use on Atlantic, Shepody, Chip Belle, Bell Chip or Centennial varieties. 60-day PHI.

1 oz
  Apply over top of potatoes to small weeds. Include 2 pt NIS/100 gal. When tank-mixing with metrlbuzin, use 1 pt NIS/100 gal and follow precautions on metrlbuzin label. 60-day PHI.

Postemergence grasses   clethodim
9-16 fl oz
  Apply to actively growing grasses. Maximum 64 fl oz/acre/year. Include 0.25% NIS/acre. 30-day PHI.

(POAST 1.5E)
1-1.5 pt
  Apply to actively growing grasses. Use high rate on perennial grasses and large annual grasses. Include 1 qt COC/acre. 30-day PHI.

Vine kill   diquat
1 pt
  Apply to mature potato vines. Make a second application within 5 days if vines are very thick. For Russet Burbank, use 2 pt in first application, 1 pt in second. Include 2 pt NIS/100 gal. 7-day PHI. RUP.

(RELY 280 2.34)
21 fl oz
  Do not apply to potatoes grown for seed. Maximum 1 application/year. 9-day PHI.