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United States Department of Agriculture

Agricultural Research Service

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

Location: Horticultural Crops Research

2013 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). FY01 $54,878 Program Increase. FY02 Program Increase $16,656. Replacing 0500-00007-056-00D (10/04) and 0500-00007-071-00D (11/2005). Replacing 0500-00007-087-00D (09/2010).


3.Progress Report:
In 2013 we conducted a series of experiments to test for phytotoxic effects of various chemicals on nursery crops and to evaluate efficacy of various chemicals for disease control in Corvallis, Oregon.

In total, we conducted 5 trials for metconazole, 7 trials for triticonazole, 6 trials for acibenzolar, 5 trials for cyflufenamid, 5 trials for tebuconazole, 6 trials for fluensulone and 6 trials for amectoctraden + dimethomorph on a range of ornamental plants. Tests were run using the IR-4 protocols wherein chemicals are applied at 1X-4X rates. 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.

We also repeated trials to evaluate efficacy of fungicides for control of Pythium damping off on douglas fir seedlings. Specific Pythium species used in this study were P. vipa, P. dissotocum, and P. irregulare. Experiments were conducted by planting Douglas Fir seeds in 0.45L plastic pots with 10 seeds per pot. Pots were arranged in a randomized complete block design with 8 replications. Treatments included: a noninoculated control, Adorn, Aliette, Alude, BW240WP, BW240+Alude, Cg100, Disarm, Fenstop, Heritage, Pageant, Subdue Max, and a nontreated control. Disease development was analyzed and reported.


4.Accomplishments
1. Inter-Regional Number 4 Project (IR-4). The IR-4 Project develops efficacy and phytotoxicity data for use in ornamental crop research. Data is needed to support new EPA tolerances and labeled product uses. We evaluated a range of agrochemicals for phytotoxicity to minor use, ornamental plants. 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 fungicides on ornamental plants.


Last Modified: 11/23/2014
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