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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


2012 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.

3. Progress Report:
Research was conducted to develop new pest control tools in ornamental crops, which is often not cost effective for industry, leaving a shortage of available tools for growers of horticultural crops to use. The ARS, IR-4 unit at Prosser, WA, and Northwest Horticulture, Mabton, WA, cooperated to collect and submit data required to establish registrations for ten new herbicides based on 32 field trials. Completed trials include oxyflourfen + prodiamine, flumioxazin, sulfentrazone + prodiamine, dimethenamid-p + pendimethalin, mesotrione, trifluralin + isoxaben, isoxaben, indaziflam, sulfosulfuron, and dimethenamid-p tested on 18 plant species (Box elder, camellia, canna, Carex, daylily, dogweed, burning bush, elm, geranium, hawthorn, eastern hemlock, western hemlock, liatris, rose mallow, muhly, oak, pampas grass, and peony). The completed research will support new registrations of these herbicides in the tested ornamental crops. In addition, five crop safety studies were conducted on peas, asparagus, Timothy hay, wine grapes, and blueberry with five herbicides (saflufenacil, carfentrazone, flufenacet, mesotrione, and pendimethalin).

4. Accomplishments
1. Determination of plant response to new herbicides. This research determined the response of eighteen ornamental plant species to new herbicides and five food crops to five herbicides. The crop safety of the herbicides on these species was previously unknown. Field tests were conducted by ARS scientists in the Vegetable and Forage Crops Research Unit in Prosser, WA, on eighteen container grown ornamental species. 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 pest control for ornamental plants and specialty food crops.

Last Modified: 05/28/2017
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