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2009 Weed Control Guide
for Vegetable Crops
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CROP INFORMATION
Asparagus
Beans
Beets
Broccoli
Brussels Sprouts
Cabbage
Carrot
Cauliflower
Celery
Chicory
Chinese Vegetables
Collards
Corn
Cucumber
Dill
Eggplant
Endive
Escarole
Garlic
Horseradish
Kale
Kohlrabi
Leek
Lettuce
Mint
Muskmelon
Mustard
Okra
Onion
Parsley
Parsnip
Peas
Pepper
Potato
Pumpkin
Radish
Rhubarb
Rutabaga
Spinach
Squash
Strawberry
Sweet Potato
Swiss Chard
Tomato
Turnip
Turnip Greens
Watermelon
Non-crop Land
POTATO
| Weed Problem | Chemical | Pounds Active Ingredient (AI)/Acre | Amount of Commercial Product/Acre |
Remarks and Limitations Items in bold have changed since the printed bulletin. |
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| Emerged quackgrass and other perennials | glyphosate (ROUNDUP 4L) |
2 | 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 annual grasses and broadleaves | dimethenamid-P (OUTLOOK 6E) |
0.56-0.98 | 12-21 fl oz |
Apply preemergence after drag-off. One application per year. Supresses eastern black nightshade and yellow nutsedge. 40 day PHI. | ||||
| EPTC (EPTAM 7E) |
4-6 | 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. | |||||
| pendimethalin (PROWL 3.8ACS) |
0.71 | 1.5 pt |
Apply soon after planting. Do not use on muck soil or soil with less than 1.5% OM. Needs rain within 7 days to activate. Follow with a delayed preemergence application of linuron or metrlbuzin. | |||||
| s-metolachlor (DUAL MAGNUM 7.6E) |
0.95-1.9 | 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 | linuron (LOROX 50DF) |
1 | 2 lb |
Follow preemergence treatments listed above. Apply before potatoes emerge but after weeds have emerged. | ||||
| metrlbuzin (SENCOR 75DF) |
0.5 | 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. | |||||
| rimsulfuron (MATRIX 25DF) |
0.023 | 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 (SENCOR 75DF) |
0.25 | 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. | ||||
| rimsulfuron (MATRIX 25DF) |
0.016 | 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 (SELECT MAX 0.97E) |
0.068-0.12 | 9-16 fl oz |
Apply to actively growing grasses. Maximum 64 fl oz/acre/year. Include 0.25% NIS/acre. 30-day PHI. | ||||
| sethoxydim (POAST 1.5E) |
0.19-0.28 | 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 (REGLONE 2L) |
0.25 | 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. | ||||
| glufosinate (RELY 200 1.67) |
0.378 | 29 fl oz |
Do not use on potatoes grown for seed. Maximum 1 application/yr. 9-day PHI. | |||||
| paraquat (GRAMOXONE MAX 3L) |
0.25-0.47 | 11-20 fl oz |
Do not use on potatoes grown for seed or storage. Apply in a min. of 20 gal/acre. Use 20 oz for quick vine kill. Use 2 appls. of 11 oz for dense vines. Wait 5 days between treatments. 3-day PHI. RUP. | |||||