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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Potted impatiens growing in a well-maintained greenhouse.

Floriculture and Ornamental Nurseries

Treatment (Inside Greenhouses)

(Reviewed 7/00, updated 7/00)

In this Guideline: More about weeds in floriculture
and ornamental nurseries:
  Herbicide  
  (commercial name) Amount to Use
  POSTEMERGENT HERBICIDES
A. DIQUAT
  (Reward) Spot application: 1-2 pt plus 8-16 oz nonionic surfactant/100 gal water
    Broadcast: 1-2 pt plus 16-32 oz nonionic surfactant/100 gal water
  COMMENTS: Apply in 15-40 gal water/acre. Do not allow contact of spray or drift to desirable foliage.
     
B. GLUFOSINATE
  (Finale) Spot application: 1.5 fl oz/1 gal water
    Broadcast application: 3 qt when weeds less than 6 inches tall or
    5 qt when weeds are 6 inches or taller
  COMMENTS: Apply as directed spray under benches or on floors of the greenhouse or around the periphery of the greenhouse. Do not have air circulation fans running. Apply using large droplets and low pressure to avoid drift or contact with green leaves or stems. Do not use in greenhouses with edible crops.
     
C. GLYPHOSATE
  (Roundup Pro) Spot application: 0.66-1.33 oz product/1 gal water
    Broadcast application: (annuals) 2 qt-1 gal/100 gal water
    (perennials) up to 2 gal/100 gal water
  COMMENTS: Apply to young weeds under benches along walkways or along the edge of the greenhouses. Use low pressure and large droplets to reduce chance of drift of spray on to leaves of the crop. Do not apply to any runoff water. Turn off air circulation fans during application. Desirable vegetation should not be present during application.
     
D. PELARGONIC ACID
  (Scythe)  
  COMMENTS: Apply to young weeds under benches, along walkways, or along the edge of greenhouses. Apply in a ventilated area.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Floriculture and Ornamental Nurseries
UC ANR Publication 3392
Weeds
C. L. Elmore, Weed Science/Vegetable Crops, UC Davis
C. A. Wilen, UC IPM Program, UC Cooperative Extension, San Diego Co.

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See How to manage pests, or in the U.S., contact your local Cooperative Extension office for assistance. /PMG/r280700911.html revised: June 13, 2005. Contact webmaster.