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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 3/09, updated 3/09)

In this Guideline: More about weeds in floriculture
and ornamental nurseries:
Herbicide Amount to Use R.E.I.+
(commercial name)   (hours)
When choosing a pesticide, consider information relating to environmental impact. Not all registered pesticides are listed. Always read label of product being used.
 
POSTEMERGENT HERBICIDES
A. DIQUAT
  (Reward) Spot application: 1–2 pt plus 8–16 oz nonionic surfactant/100 gal water 24
    Broadcast: 1–2 pt plus 16–32 oz nonionic surfactant/100 gal water
  WSSA MODE OF ACTION GROUP NUMBER1: 22
  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 12
    Broadcast application: 3 qt when weeds less than 6 inches tall or 5 qt when weeds are 6 inches or taller  
  WSSA MODE OF ACTION GROUP NUMBER1: 10
  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 4
    Broadcast application: (annuals) 2 qt–1 gal/100 gal water
(perennials) up to 2 gal/100 gal water
  WSSA MODE OF ACTION GROUP NUMBER1: 9
  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) 12
  WSSA MODE OF ACTION GROUP NUMBER1: 27
  COMMENTS: Apply to young weeds under benches, along walkways, or along the edge of greenhouses. Apply in a ventilated area.
 
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.
+ 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.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

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

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Statewide IPM Program, Agriculture and Natural Resources, University of California
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