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United States Department of Agriculture

Agricultural Research Service

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Research Project: Minor Use Pesticide Testing on Floral and Nursery Crops

Location: Horticultural Crops Research

2011 Annual Report

1a. Objectives (from AD-416)
Evaluate various fungicides, insecticides, and herbicides for phytotoxicity and/or efficacy on floral and nursery crop plants in support of label expansion through the IR-4 regional project.

1b. Approach (from AD-416)
Selected floral and nursery crop species will be grown in the greenhouse, ground beds, or field plantings and treated according to specific protocols (timing, concentrations) with selected fungicides, insecticides, or herbicides. In some cases, chemicals will be tested for efficacy, but mostly they will be tested on plants for phytotoxicity. Data will be submitted for inclusion in the IR-4 Minor Use Testing Program. Replacing 0500-00007-043-00D (10/99). Replacing 0500-00007-056-00D (10/04) and 0500-00007-071-00D (11/2005). Replacing 0500-00007-087-00D (09/2010).

3. Progress Report
Projects were conducted to test for phytotoxic effects of various chemicals on nursery crops in Corvallis, Oregon. Tests were run on various ornamental plants using the IR-4 protocols wherein chemicals are applied up to 4X rates in four types of planting regimes: greenhouse beds, greenhouse pots, field beds, and field pots. In addition, we conducted efficacy trials to test efficacy of different fungicides for control of Pythium species accusing damping off of Douglas fir seedlings. The results of these tests were reported to the IR-4 project at Rutgers University and are forwarded to the product manufacturer to be used in their request to expand the label to include the tested ornamental plants, eventually, with label expansion, growers be should able to legally use these chemicals on ornamental nursery crops.

4. Accomplishments
1. Evaluating fungicides for the control of soilborne plant pathogens in nursery crops. The decline in the number of commercially available herbicides, insecticides, and fungicides for use by the nursery industry is a serious problem. ARS scientists at the Horticultural Crops Research Unit in Corvallis, Oregon are currently conducting research directed at testing fungicides against species of Phytophthora and Pythium as the target pathogen genera, this year focusing solely on Pythium species. In addition, a number of chemicals are being tested for phytotoxicity against several ornamental plants. The results of these tests will provide data specifically focused on controlling Phytophthora and Pythium diseases on nursery crops, identified as one of the most important pathogen group affecting the industry. This research is part of the IR-4 Program at Rutgers University, established to expand the label registrations for chemicals to make them available for safe use on minor crops.

Last Modified: 05/22/2017
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