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How to Manage Pests

UC Pest Management Guidelines


Common lambsquarters, Chenopodium album.

Celery

Herbicide Treatment Table

(Reviewed 10/05, updated 6/09)

In this Guideline: More about weeds in celery:

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

  Calculate impact of pesticide on air quality
BEFORE PLANTING
A. TRIFLURALIN 0.5–1 lb a.i.    
  (Treflan) HFP 1–2 pt 12 NA
  WSSA MODE OF ACTION GROUP NUMBER1: 3
  COMMENTS: Preplant incorporate 2–3 inches deep. Use high rate on clay soils.
 
B. GLYPHOSATE 2 lb a.i.  
  (Roundup) 1.45 qt 4 NA
  WSSA MODE OF ACTION GROUP NUMBER1: 9
  . . . or . . .
  (Touchdown) 0.9375 lb a.i.    
    1.25 qt 12 NA
  COMMENTS: Apply to seedling weeds before seeding or before celery emergence.
 
C. OXYFLUORFEN 0.25–0.5 lb a.i.    
  (Goal) 2XL 1–2 pt 24 NA
  WSSA MODE OF ACTION GROUP NUMBER1: 14
  COMMENTS: Apply to fallow beds at least 30 days before transplanting. After application, thoroughly work the fallow beds to a depth of at least 2.5 inches before planting.
 
D. PELARGONIC ACID
  (Scythe) Label rates 12 NA
  MODE OF ACTION: Unknown.
 
BEFORE TRANSPLANTING
A. PROMETRYN 4L 1–2 lb a.i. 24 0
  WSSA MODE OF ACTION GROUP NUMBER1: 5
  COMMENTS: Apply only 1 application in a minimum of 20 gal water/acre during the 2- to 6-week period before transplanting. Application may be made over the celery. Apply before weeds are 2 inches tall. On coarse-textured soils and low organic matter soils, make one application of 2–4 pt/acre. On fine-textured soils, use 3.2–4 pt/acre. Make the application up to 21 days before transplanting. Note: A post-transplant application is not allowed if the pre-transplant application was made at the maximum allowable use rate of 4 pt/acre.
 
B. BENSULIDE 5–6 lb a.i.    
  (Prefar) 4-E 5–6 qt 12 0
  WSSA MODE OF ACTION GROUP NUMBER1: 8
 
C. S-METOLACHLOR 0.64–1.27 lb a.i. 24 62
  (Dual Magnum 7.63)
  WSSA MODE OF ACTION GROUP NUMBER1: 15
  COMMENTS: Apply as a preplant surface applied or preplant incorporated application before transplanting. It can also be applied post-transplant as a directed spray or as a broadcast postemergent application. Rate applied depends on the texture of the soil with lower rates applied to coarse-textured soils and higher rates to finer-textured soils. Multiple applications are allowed but the season total cannot exceed 2 pt/acre.
 
AT PLANTING (DIRECT-SEEDED)
A. PROMETRYN 4L 1.2–1.6 lb a.i. 24 NA
  WSSA MODE OF ACTION GROUP NUMBER1: 5  
  COMMENTS: Apply after seeding. Sprinkler irrigate within 48 hours. Apply at least 1 inch of water. Do not use on sand or loamy sand.
 
B. BENSULIDE 5–6 lb a.i.    
  (Prefar) 4-E 5–6 qt 12 NA
  WSSA MODE OF ACTION GROUP NUMBER1: 8
 
AFTER PLANTING
A. PROMETRYN 4L 1–2 lb a.i. 24 45
  WSSA MODE OF ACTION GROUP NUMBER1: 5    
  COMMENTS: For transplanted celery; apply during the 2- to 6-week period after transplanting. Actual dosage will depend on soil texture; use lower rate on coarse-textured soils. DO NOT USE SURFACTANT. Apply before weeds are 2 inches tall. May cause detectable plant injury if warm weather follows application, but celery usually outgrows the injury without a significant reduction in yield or quality.
 
B. LINURON 0.75–1 lb a.i.    
  (Lorox) DF 1.5–2 lb 24 67
  WSSA MODE OF ACTION GROUP NUMBER1: 7
  COMMENTS: Use only on transplants; do not use after celery is 8 inches high. Do not apply in less than 20 gal water/acre by ground. Rate is determined by the size of the weed and soil type. With younger weeds lower rate may be used. May cause detectable plant injury if warm weather follows application, but celery usually outgrows the injury without a significant reduction in yield or quality.
 
C. SETHOXYDIM 0.1875–0.28 lb a.i. 12 30
  (Poast) 1–1.5 pt  
  WSSA MODE OF ACTION GROUP NUMBER1: 1
  COMMENTS: Apply when celery has at least 2 true leaves. Use an approved oil concentrate at 2 pt/acre.
 
D. CLETHODIM 0.09093–0.12125 lb a.i. 24 30
  (Select Max) 12–16 fl oz  
  WSSA MODE OF ACTION GROUP NUMBER1: 1
  COMMENTS: Use an approved crop oil concentrate at 1% (volume by volume).
 
E. CARFENTRAZONE 0.00742–0.031 lb a.i. 12 0
  (Shark) 0.5–2 fl oz    
  WSSA MODE OF ACTION GROUP NUMBER1: 14
  COMMENTS: May be applied to the furrows between the rows using a hooded sprayer. Do not apply more than 6.1 oz/acre (0.096 lb a.i./acre) per crop season. Weed should be less than 4 inches tall and rosettes less than 3 inches across. Care must be taken to avoid contact with the crop. A spray adjuvant such as nonionic surfactant, methylated seed oil, or crop oil concentrate is required.
 
+ 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.
NA Not applicable.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Celery
UC ANR Publication 3439
Weeds
R. F. Smith, UC Cooperative Extension, Monterey County
Acknowledgment for contributions to Weeds:
C. E. Bell, UC Cooperative Extension, San Diego County
W. E. Bendixen, UC Cooperative Extension, Santa Barbara County
R. J. Mullen, UC Cooperative Extension, San Joaquin County

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