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UC Pest Management Guidelines


London rocket, Sisymbrium irio seedling.

Cole Crops

Herbicide Treatment Table

(Reviewed 6/07, updated 11/08)

In this Guideline: More about weeds in cole crops:

Common name Amount/Acre R.E.I.+ P.H.I.+
(trade name)   (hours) (days)

  Calculate impact of pesticide on air quality
When choosing an herbicide, consider information relating to environmental impact. Not all registered pesticides are listed. Always read label of product being used.
 
FALLOW
A. PARAQUAT* 0.49–1 lb ai 12 0
  (Gramoxone Inteon) 1.3–2.7 pt    
  WSSA MODE OF ACTION GROUP NUMBER1: 22
  COMMENTS: For use on broccoli, cabbage, Chinese cabbage, or cauliflower fields only. Apply to emerged weeds on winter beds; this contact herbicide will control many seedling weeds. Addition of a surfactant is essential for good control.
 
B. GLYPHOSATE 1–3 lb a.i. 12 0
  (Roundup) 1–3 qt    
  WSSA MODE OF ACTION GROUP NUMBER1: 9
  COMMENTS: Rate depends on weed species. Apply to emerged weeds on winter beds. Seed into undisturbed soil for maximum effectiveness. Adding ammonium sulfate often enhances control in areas with hard water.
 
C. EPTC
  (Eptam Selective) 7E 3.5–7 pt 12 0
  WSSA MODE OF ACTION GROUP NUMBER1: 8
  COMMENTS: For fallow ground applications to suppress nutsedge. Apply at least 90 days before planting broccoli, cabbage, or cauliflower. Use allowed under a supplemental 24(c) label.
 
D. PELARGONIC ACID
  (Scythe) 3–5% v/v in 75 to 200 gal water/acre 12 0
  WSSA MODE OF ACTION GROUP NUMBER1: 27
  COMMENTS: For nonselective burndown of weeds on winter beds. The smaller the weeds, the more effective the control.
 
PREPLANT
Before weeds emerge
A. TRIFLURALIN 0.5–0.75 lb a.i. 12 0
  (Treflan) HFP 1-1.5 pt    
  WSSA MODE OF ACTION GROUP NUMBER1: 3
  COMMENTS: Preplant incorporate for direct-seeded cole crops. Effective on summer broadleaf and grassy weeds. Avoid use in cold, wet soils or under arid desert conditions.
 
B. BENSULIDE 5–6 lb a.i. 12 0
  (Prefar) 4E 5–6 qt    
  WSSA MODE OF ACTION GROUP NUMBER1: 8
  COMMENTS: Apply preplant and mechanically incorporate 1–2 inches. May be followed by sprinkler or furrow irrigation. Effective on summer broadleaf and grassy weeds.
 
C. NAPROPAMIDE 0.5–1.0 lb a.i. 12 0
  (Devrinol) 50DF 1–2 lb    
  WSSA MODE OF ACTION GROUP NUMBER1: 15
  COMMENTS: Best used on transplants. This herbicide has a narrow margin of direct-seeded cole crop tolerance. Do not use on cabbage in California. Use lower rate on coarse-textured soils.
 
PRETRANSPLANT
Before weeds emerge
A. TRIFLURALIN 0.5–0.75 lb a.i. 12 0
  (Treflan) 4L 1-1.5 pt    
  WSSA MODE OF ACTION GROUP NUMBER1: 3
  COMMENTS: Preplant incorporate with rotary-powered equipment for bed planting; if planting flat, shallow discing is acceptable. Transplanted cole crops have a higher level of selectivity than direct-seeded cole crops, but keep this material in the upper 2–4 inches of soil for optimum selectivity.
 
B. OXYFLUORFEN 0.25–0.5 lb a.i.    
  (Goal) 2XL 1–2 pt 24 0
  (GoalTender) 4F 0.5–1 pt 24 0
  WSSA MODE OF ACTION GROUP NUMBER1: 14
  COMMENTS: For use before transplanting broccoli, cauliflower, and cabbage. Apply to preshaped beds. If weeds are present, add a surfactant to enhance weed kill. The high rate is especially useful for hard-to-control weeds such as little mallow. Do not use on Brussels sprouts. Do not disturb the soil after treatment except for the transplanting operation. After application at least 0.25 inch rainfall or irrigation is needed to activate the herbicide.
 
C. NAPROPAMIDE 0.5–1.0 lb a.i. 12 0
  (Devrinol) 50DF 1–2 lb    
  WSSA MODE OF ACTION GROUP NUMBER1: 15
  COMMENTS: Use only on broccoli, Brussels sprouts, and cauliflower. Best used on transplants. This herbicide has a narrow margin of direct-seeded cole crop tolerance. Do not use on cabbage in California. Use lower rate on coarse-textured soils.
 
AT PLANTING
Before crop and weeds emerge
A. DCPA 4.5–10.5 lb a.i. 12 0
  (Dacthal) 75W 6–14 lb    
  WSSA MODE OF ACTION GROUP NUMBER1: 3
  COMMENTS: Apply at planting as a banded spray to control annual grasses and some annual broadleaf weeds. Incorporate with sprinkler irrigation. DCPA can be sprayed directly over transplants without injury. In sandy loam soils, maximum preemergence rate of 10 lb/acre is recommended.
 
B. BENSULIDE 5–6 lb a.i. 12 0
  (Prefar) 4EC 5–6 qt    
  WSSA MODE OF ACTION GROUP NUMBER1: 8
  COMMENTS: After planting apply as a surface application and follow immediately with sprinkler irrigation.
 
C. NAPROPAMIDE 0.5–1.0 lb a.i. 12 0
  (Devrinol) 50DF 1–2 lb    
  WSSA MODE OF ACTION GROUP NUMBER1: 15
  COMMENTS: Use only on broccoli, Brussels sprouts, and cauliflower. May be applied post transplant or on established transplants followed by sprinkler irrigation. Do not use on cabbage in California.
 
POSTPLANT
After crop and weeds emerge
A. SETHOXYDIM 0.09–0.28 lb a.i. 12 30
  (Poast) 0.5–1.5 pt    
  WSSA MODE OF ACTION GROUP NUMBER1: 1
  COMMENTS: Maximum use per crop is 3 applications, not to exceed 3 pt/acre/season. Effective on grass seedlings except for annual bluegrass (Poa annua). Apply when grasses are small and actively growing. Do not cultivate within 5 days before or 7 days after application. An oil adjuvant is needed to achieve consistent weed control. Do not apply within 30 days of harvest.
 
B. CLETHODIM 0.091–0.12 lb a.i. 24 30
  (Select Max) 12–16 oz/acre    
  WSSA MODE OF ACTION GROUP NUMBER1: 1
  COMMENTS: For control of annual and perennial grass weeds including annual bluegrass. Always apply with a crop oil concentrate. Use higher rates on perennial grasses. Use allowed under a supplemental label.
 
C. CARFENTRAZONE 0.031 lb a.i. 12 0
  (Shark) 2 fl oz    
  WSSA MODE OF ACTION GROUP NUMBER1: 14
  COMMENTS: May be applied to the row middles using a hooded sprayer. Take care to keep the spray material off the crop.
 
D. OXYFLUORFEN 0.125–0.25 lb a.i. 24 0
  (GoalTender) 4F 4–8 oz    
  WSSA MODE OF ACTION GROUP NUMBER1: 14
  COMMENTS: For use on broccoli and cauliflower only as a broadcast application at 4-6 oz/acre or as a directed application at 4-8 oz/acre. Apply on direct-seeded crops when they have four true leaves. Do not mix with adjuvants, fertilizers, or other pesticides. Use allowed under a supplemental label.
 
E. PELARGONIC ACID
  (Scythe) 3–5% v/v in 75 to 200 gal water/acre 12 0
  WSSA MODE OF ACTION GROUP NUMBER1: 27
  COMMENTS: May be applied to the row middles using a hooded sprayer. Take care to keep the spray material off the crop.
 
* Permit required from county agricultural commissioner for purchase or use.
+ Restricted entry interval (R.E.I.) is the number of hours (unless otherwise noted) from treatment until the treated area can be safely entered without protective clothing. Preharvest interval (P.H.I.) is the number of days from treatment to harvest. In some cases the REI exceeds the PHI. The longer of two intervals is the minimum time that must elapse before harvest.
1 Group numbers are assigned by the Weed Science Society of America (WSSA) according to different modes of action. Although weeds may exhibit multiple resistance across many groups, mode of action numbers are useful in planning mixtures or rotations of herbicides with different modes of action. For more information, see http://www.hracglobal.com.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Cole Crops
UC ANR Publication 3442
Weeds
R. F. Smith, UC Cooperative Extension, Monterey County
S.A. Fennimore, UC Cooperative Extension, Monterey County
O. Daugovish, UC Cooperative Extension, Ventura County
M. LeStrange, UC Cooperative Extension, Tulare County
Acknowledgments for contributions to Weeds:
C. E. Bell, UC Cooperative Extension, San Diego County
D. W. Cudney, Botany and Plant Sciences, UC Riverside
W. T. Lanini, Vegetable Crops/Weed Science, UC Davis

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