ASPARAGUS (Seed beds for crown production)


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

Emerged annuals   paraquat
(GRAMOXONE SL 2.0)
  0.68-1  
2.5-4.0 pt
  Apply after weeds emerge but before asparagus emerges. Include 1 pt NIS per 100 gal of spray mix.

Preemergence annuals   terbacil
(SINBAR 80 WDG)
  0.5-1.2  
0.62-1.5 lb
  Spray 300 lb/acre activated charcoal in a 1-inch band over rows at planting. Then apply Sinbar. One-half inch of moisture within 2 weeks of application will improve control. Do not use on soils with less than 1% organic matter. Do not plant any crop other than asparagus within 2 years of application.

Pre- or postemergence broadleaves   linuron
(LOROX 50DF)
  0.5-1.5  
1-3 lb
  PREEMERGENCE: Plant seed 1-1.5 inches deep; spray a 1-inch band of activated charcoal over the rows at a rate of 300 lb/acre of actual area sprayed (15 lb/acre with 20-inch rows). Broadcast 2 lb of Lorox (1 lb ai) over the field.

POSTEMERGENCE: When fern is 6-18 inches high and weeds are not over 4 inches high, broadcast 1-2 lb Lorox (1/2-1 lb ai). Do not exceed a total of 2 lb ai/acre/year.

Postemergence broadleaves, nutsedge   halosulfuron
(SANDEA 75 WDG)
  0.023-0.047  
0.5-1.0 oz
  Apply after fern is 6 weeks old. Do no apply more than 2 oz/acre/year. Do not add adjuvant. Make 2 applications for nutsedge control.

Postemergence grasses   clethodim
(SELECT MAX 0.97E)
  0.068-0.12  
9-16 fl oz
  Include 0.25% NIS/acre. Maximum of 64 fl oz/acre/year. 1 day PHI.

  fluazifop-P
(FUSILADE DX 2E)
  0.25-0.38  
1-1.5 pt
  Include 1 qt COC or 1 pt NIS/acre. Use high rate on quackgrass.

  sethoxydim
(POAST 1.5E)
  0.19-0.38  
1-2 pt
  Apply to actively growing grasses. Include 1 qt COC/acre. Maximum 5 pt/acre/year and 2 applications.

ASPARAGUS (Newly planted crowns)


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

Preemergence broadleaves and grasses   linuron
(LOROX 50DF)
  1-2  
2-4 lb
  Broadcast 2-4 lb Lorox (1-2 lb ai) before fern emergence.

  pendimethalin
(PROWL H20 3.8 ACS)
  1.14-3.9  
1.2-4.1 qt
  Cover crowns with 2-4 inches of soil before application. Apply before spears emerge. Do not apply to newly seeded asparagus.

Postemergence broadleaves   halosulfuron
(SANDEA 75 WDG)
  0.023-0.047  
0.5-1.0 oz
  Apply after fern is 6 weeks old. Do not apply more than 2 oz/acre/year. Do not add adjuvant. Make 2 applications for nutsedge control.

  linuron
(LOROX 50DF)
  1-2  
2-4 lb
  Apply when fern is 6-18 inches tall and weeds are less than 4 inches tall. Do not exceed 2 lb ai (4 lb product) pre and postemergence per year.

Postemergence grasses   clethodim
(SELECT MAX 0.97E)
  0.068-0.12  
6-9 fl oz
  Include 0.25% NIS/acre. Maximum of 64 fl oz/acre/year. 1 day PHI.

  fluazifop-P
(FUSILADE DX 2E)
  0.25-0.38  
1-1.5 pt
  Include 1 qt COC or 1 pt NIS/acre. Use high rate on quackgrass.

  sethoxydim
(POAST 1.5E)
  0.19-0.38  
1-2 pt
  Apply to actively growing grasses. Include 1 qt COC/acre. Maximum 5 pt/acre/year and 2 applications.

ASPARAGUS (Established one year or more)


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

Emerged annuals   paraquat
(GRAMOXONE SL 2.0)
  0.68-1  
2.5-4.0 pt
  Apply before crop emergence or after the last harvest after all spears have been removed. Include 1 pt NIS/100 gal. 6-day PHI. RUP.

Preemergence annuals   diuron
(KARMEX 80DF)
  0.8-3.2  
1-4 lb
  Apply after mowing fern in spring and after harvest. Use low rate on sandy soil. Do not exceed 6 lb product/acre/year. 6-8 weeks residual activity.

  flumioxazin
(CHATEAU 51WDG)
  0.128-0.192  
4-6 oz
  Make one application after final harvest of spears. Good control of most annual broadleaves and grasses. 6-8 weeks of horseweed control. May cause some scoring of spears if applied preemergence. Use once in 2 years.

  mesotrione
(CALLISTO 4SC)
  0.094-0.241  
3-7.7 fl oz
  Apply before spear emergence in spring of after final harvest. Add COC or NIS to improve burndown of emerged weeds. Do not exceed 7.7 fl oz/acre/year. A post harvest application may cause some fern bleaching. Controls most annual broadleaves and grasses. Use once in 2 years.

  metrlbuzin
(TRICOR 75DF)
  0.5-1.0  
0.67-1.3 lb
  Apply after mowing fern in spring and after harvest. Do not exceed 2.6 lb product/acre/year. Good sandbur control. Use low rate if in combination with Karmex. 6-8 week residual activity. 14-day PHI.

  norflurazon
(SOLICAM 80DF)
  2-4  
2.5-5 lb
  Apply in fall after chopping fern or in spring before emergence. Use lower rate on coarse, sandy soil. Apply only once per season. Gives 1-2 months' residual activity. Suppresses nutsedge. 14-day PHI.

  pendimethalin
(PROWL H20 3.8 ACS)
  1.14-3.9  
1.2-4.1 qt
  Apply before weed emergence in the spring. Use low rate on sandy soil. Include a contact herbicide if weeds have emerged. 14 day PHI. Maximum 4.1 qt/acre/year

  s-metolachlor
(DUAL MAGNUM 7.62EC)
  1.26-1.9  
1.33-2.0 pt
  Apply before asparagus and weeds emerge in spring, or after the harvest season. Needs moisture for activation. 16-day PHI. 1 application/crop. See: www.farmassist.com for Michigan 24C indemnified label.

  sulfentrazone
(SPARTAN 4F)
  0.14-0.375  
4.5-12 fl oz
  Apply in spring before crop emerges. Use low rate on light soil. Do not use on soils with <1% OM. Maximum 12 oz product/acre in 1 application/year. 14-day PHI.

  terbacil
(SINBAR 80 WDG)
  0.5-1.2  
0.62-1.5 lb
  Apply after mowing in spring. Do not use on light soil. May be applied after a clean cutting. Do not exceed 1.5 lb product/acre/year. Do not plant other crops within 2 years of last application. 5-day PHI.

Postemergence broadleaves   2,4-D amine salts
(FORMULA 40 (3.8L))
  1.4-1.9  
1.5-2 qt
  Apply before, during or after the harvest season when weeds are growing rapidly. During harvest, spray soon after a pick to minimize crop injury. In fern, use drop nozzles. 3-day PHI.

  clopyralid
(SPUR 3L)
  0.19-0.25  
8-10.7 fl oz
  Apply before or during harvest. Maximum of 0.67 pt/acre/year. May cause some crooking of spears. Controls Canada thistle, marestail, mayweed, nightshade, plantain, smartweeds. Avoid application 2 years in succession. 2-day PHI.

  dicamba
(BANVEL 4L)
(CLARITY 4L)
  0.25-0.5  
0.5-1 pt
0.5-1 pt
  Apply to actively growing weeds immediately after a harvest. Use high rate for control of perennial weeds. Apply in tank mix with 2,4 D or glyphosate for control of Canada thistle or field bindweed. Discard crooked spears at harvest. Do not exceed 1 pt/acre/year. 24-hr PHI.

  halosulfuron
(SANDEA 75 WDG)
  0.023-0.047  
0.5-1 oz.
  Apply anytime during the season to kill nutsedge or broadleaves. Use drop nozzles in standing fern. Do not include NIS in spray mix during harvest. Maximum 2 oz/acre/year in 2 applications. 1-day PHI.

  linuron
(LOROX 50DF)
  1-2  
2-4 lb
  Apply before or after crop emergence. Use high rate preemergence. Do not exceed 4 lb ai/acre/year. 6 weeks residual activity. 1-day PHI.

Postemergence grasses   clethodim
(SELECT MAX 0.97E)
  0.068-0.12  
9-16 fl oz
  Include 0.25% NIS/acre. Maximum of 64 fl oz/acre/year. 1 day PHI.

  fluazifop-P
(FUSILADE DX 2E)
  0.25-0.38  
1-1.5 pt
  Apply to actively growing grasses. Include NIS or COC. Maximum 3 pt/acre/year. 1-day PHI.

  sethoxydim
(POAST 1.5E)
  0.19-0.38  
1-2 pt
  Apply to actively growing grasses. Include 1 qt COC in 20 gal water/acre. Maximum 5 pt and 2 applications/year. 1-day PHI.

Emerged perennials, quackgrass, volunteer asparagus   glyphosate
(ROUNDUP 4L)
(TOUCHDOWN 4L)
  1-4  
1-4 qt
1-4 qt
  PREEMERGENCE: Apply at least 7 days before asparagus emergence.

SPOT TREATMENT: Apply immediately after a clean harvest. Do not treat more than 10% of total field area. 5-day PHI.

POSTHARVEST: Apply immediately after the last harvest and all spears have been removed, or allow fern to develop and apply to soil as a shielded or directed spray. Do not allow herbicide to contact emerged spears or fern.