Location: Horticultural Crops Research2012 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.
3. Progress Report:
In 2011 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 23 trials for Metconazole and Triticonazole, 6 trials for Acibenzolar, and 5 trials for Fluopicolide on a range of ornamental plants. Tests were run using the Interregional Research Project No. 4 protocols wherein chemicals are applied up to 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 conducted 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+Al, Cg100, Disarm, Fenstop, Heritage, Pageant, Subdue Max, and a nontreated control. Disease development in these trials was inconsistent and the experiments are thus being repeated in 2012.