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United States Department of Agriculture

Agricultural Research Service

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Research Project: Herbicide Efficacy Studies in Ornamental and Vegetable Crops


2013 Annual Report

1a. Objectives (from AD-416):
Objective 1: Develop chemical control measures for weeds in ornamental vegetables, fruits, and specialty crops. [NP 304, C2, PS 2B] Objective 2: Determine the response of crops to herbicides to support new pesticide registrations in minor acreage crops. [NP 304, C2, PS 2B]

1b. Approach (from AD-416):
Herbicides, alone or in combination with other herbicides or with cultural and mechanical weed control methods, will be evaluated under field conditions to determine weed control and crop responses. The research conducted in this project is part of the national effort of ARS to generate information supporting the registration of minor use pesticides in cooperation with the national IR-4 program. Replaced 0500-00007-078-00D (8/10).

3. Progress Report:
Research was conducted to develop new pest control tools in ornamental crops. The ARS, Inter-Regional Project Number-4 unit at Prosser, Washington, and Northwest Horticulture, Mabton, Washington, cooperated to collect and submit data required to establish registrations for nine new herbicides based on 27 field trials. Completed trials include the herbicides oxyflourfen + prodiamine, sulfentrazone, mesotrione, carfentrazone, isoxaben, indaziflam, and dimethenamid-p + pendimethalin, pendimethalin alone, and pinoxsulam tested on 14 ornamental species (gaura, catmint, sedum rose mallow, sage, daylily, alumroot, delosperma, carex, perennial phlox, lilac, feather grass, hosta, purple coneflower, blueberry, asparagus, cherry, and wine grape). The completed research will support new registrations of these herbicides in the tested ornamental crops. In addition, four crop safety studies were conducted on asparagus, Timothy hay, wine grapes, and blueberry with five herbicides (carfentrazone, flufenacet, mesotrione, and pendimethalin).

4. Accomplishments
1. Field tests were conducted by ARS scientists in the Vegetable and Forage Crops Research Unit in Prosser, Washington. This research determined the response of fourteen ornamental plant species to new herbicides and four food crops to four new herbicides. The crop safety of the herbicides on these species was previously unknown. Data generated will be used to support registrations of these herbicides on new ornamental species and field crops. This research will aid in development of new pest control options for ornamental plants and specialty food crops.

Last Modified: 05/21/2017
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