Caneberries

Pest Management Guidelines


Herbicide Treatment Table

(Reviewed 12/09, updated 5/12, corrected 6/13)

In this Guideline: More about weeds in caneberries:

Herbicide common name Amount per acre R.E.I.‡ P.H.I.‡
(example trade name)   (hours) (days)

  Calculate impact of pesticide on air quality
 
The following are listed alphabetically. When choosing a pesticide, consider information relating to environmental impact, resistance management, the pesticide's properties, and application timing. Not all registered pesticides are listed. Always read the label of the product being used.
 
PREPLANT
 
Preemergence
 
A. 1,3-DICHLOROPROPENE+CHLOROPICRIN*
  (Telone C-35) Label rates See label NA
  COMMENTS: Fumigants such as1,3-dichloropropene are a source of volatile organic compounds (VOCs) but are minimally reactive with other air contaminants that form ozone. Fumigate only as a last resort when other management strategies have not been successful or are not available.
 
B. CARFENTRAZONE
  (Shark EW) Label rates 12 15
  WSSA MODE OF ACTION GROUP NUMBER1: 14
  COMMENTS: For weeds with hard seed coats and escaped fumigation.
 
C. METAM SODIUM*
  (Vapam, etc.) Label rates See label NA
  COMMENTS: For spot treatment of certain perennials.
. . . or . . .
  METAM POTASSIUM*
  (K-Pam) Label rates See label NA
 
Postemergence
 
A. CARFENTRAZONE
  (Shark EW) Label rates 12 15
  WSSA MODE OF ACTION GROUP NUMBER1: 14
  COMMENTS: Apply when weeds are small.
 
B. GLYPHOSATE 1–4 lb a.i. See label 14
  (Roundup PowerMax)
  . . . or . . .
  (Touchdown HiTech) Label rates See label 14
  WSSA MODE OF ACTION GROUP NUMBER1: 9
  COMMENTS: Apply in controlled droplet application or with low-pressure flat fan nozzles. For annual weed control use 10–40 gal water/acre with 1 lb/acre. Apply to young annuals or vigorously growing perennials in the early flowering stage or to nutsedge when it has 5–6 leaves. Some perennials require the 3.7 lb a.i. (Roundup) or 3.75 lb a.i. (Touchdown)/acre rate for control. Adding sprayable ammonium sulfate at 5 to 10 lb/100 gal of spray solution before the glyphosate is added can often improve control.
 
C. PELARGONIC ACID
  (Scythe) 3–5% v/v in 75–200 gal 12 0
  WSSA MODE OF ACTION GROUP NUMBER1: 27
  COMMENTS: A contact, nonselective herbicide. Most effective on small weeds with good spray coverage. Apply before planting or before cane emergence.
 
POSTPLANT
 
Preemergence
 
A. CARFENTRAZONE
  (Shark EW) Label rates 12 15
  WSSA MODE OF ACTION GROUP NUMBER1: 14
  COMMENTS: For weeds with hard seed coats and that escaped fumigation. Not recommended for blackberries or young raspberries. Apply to base of canes, do not contact foliage.
 
B. DIURON 2.4 lb a.i. 12 0
  (Karmex, Direx)
  WSSA MODE OF ACTION GROUP NUMBER1: 7
  COMMENTS: Direct spray to the soil under canes at least 3 years of age. Do not apply more than 2.4 lb a.i./acre per season. Considered to be a ground water contaminant and requires a use permit within Ground Water Protection Areas. Pay special attention to soil texture and rate adjustments; do not use on soils with less than 1% organic matter. Residual period: 8–12 months. For best results, apply during the winter months when weeds are less than 2 inches. See label for rainfall concerns.
 
C. NAPROPAMIDE 4 lb a.i.    
  (Devrinol 50DF) 8 lb 24 0
  WSSA MODE OF ACTION GROUP NUMBER1: 15
  COMMENTS: Apply in 20–60 gal water/acre. Must be incorporated within 4 to 7 days of application or sprinkler irrigated. Can be combined with a postemergence if weeds have emerged.
 
D. ORYZALIN 2–4 lb a.i.    
  (Surflan AS) 2–4 qt 24 0
  WSSA MODE OF ACTION GROUP NUMBER1: 3
  COMMENTS: Apply in 20–60 gal water/acre. If rain does not occur within 21 days, sprinkle irrigate with 1/2 to 2 inches water. May be combined with postemergence if weeds have emerged. Most applications are with the 4 lb a.i./acre rate to give maximum residual.
 
E. SIMAZINE 2–4 lb a.i. 12 See label
  (Princep 4L, Princep Caliber 90, etc.)
  WSSA MODE OF ACTION GROUP NUMBER1: 5
  COMMENTS: Apply to the soil under vines older than 3 years anytime between harvest and early spring. Make only 1 application/year. Use the high rate for heavy soils. Simazine is frequently used in combination with other preemergence herbicides. On light soils, simazine often is used at rates of 0.5–1 lb/acre. Do not use on gravel, sand, or loamy sand soils. If an irrigation is applied immediately after application, limit water to 0.5 inch. Considered to be a ground water contaminant and requires a use permit within Ground Water Protection Areas. Residual period: 8–12 months.
 
Postemergence
 
A. CARFENTRAZONE
  (Shark EW) Label rates 12 15
  WSSA MODE OF ACTION GROUP NUMBER1: 14
  COMMENTS: Apply when weeds are small. Not recommended for blackberries or young raspberries. Apply to base of canes, do not contact foliage.
 
B. GLYPHOSATE 0.5–1 lb a.i. See label See label
  (Roundup)
  WSSA MODE OF ACTION GROUP NUMBER1: 9
 
C PARAQUAT* 0.64–1 lb a.i 24 0
  (Gramoxone Inteon)
  WSSA MODE OF ACTION GROUP NUMBER1: 22
  COMMENTS: Apply in 30–60 gal water/acre to young plants. Thorough wetting of the weed foliage is essential for control. Use a 0.5% nonionic surfactant. Repeat treatment as new growth occurs. Do not treat more than 3 times per year.
 
D. SETHOXYDIM 0.28–0.46 lb a.i. 12 45
  (Poast)
  WSSA MODE OF ACTION GROUP NUMBER1: 1
  COMMENTS: Apply to young annual or perennial grasses. Repeat applications will be required for the control of perennial grasses. Add 2 pt crop oil concentrate to the spray solution. Do not apply to grass that is stressed or poor control may result. Residual period: less than 1 month.
 
Herbicide Combinations
For tank mixes, observe all directions for use on all labels, and employ the most restrictive limits and precautions. Never exceed the maximum a.i. on any label when tank mixing products that contain the same a.i.
 
A. GLYPHOSATE 1 lb a.i. See label See label
  (Roundup PowerMax)
  WSSA MODE OF ACTION GROUP NUMBER1: 9
  . . . PLUS . . .
  ORYZALIN 4 lb a.i.    
  (Surflan AS) 4 qt 24 0
  WSSA MODE OF ACTION GROUP NUMBER1: 3
  . . . or . . .
  NAPROPAMIDE 4 lb a.i. 24 0
  (Devrinol 50DF) 8 lb    
  WSSA MODE OF ACTION GROUP NUMBER1: 15
  COMMENTS: Combines post- and preemergence activity to control existing weeds, leaving residual control of most annual weeds up to 6 months. Combination choice depends on weed spectrum and how rapidly the application can be incorporated. Be sure to follow restrictions on labels of both products in a tank mix; the most restrictive limits must be followed.
 
* 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 until the orchard can be harvested. In some cases the R.E.I. exceeds the P.H.I. The longer of these two intervals is the minimum time that must elapse before harvest may take place.
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.
NA Not applicable

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Caneberries
UC ANR Publication 3437

Weeds
  • O. Daugovish, UC Cooperative Extension, Ventura County
  • M. P. Bolda, UC Cooperative Extension, Santa Cruz County

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