2007 Annual Report 1a.Objectives (from AD-416) Develop chemical control measures for weeds in ornamental vegetables, fruits, and specialty crops (so-called minor acreage crops). Determine the response of crops to herbicides to support new pesticide registrations in minor acreage crops. 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 general information supporting the registration of minor use pesticides in cooperation with the national IR-4 program. Replaced 0500-00007-063-00D (8/05). 3.Progress Report Minor Use Pesticide Trials Initiated: Fifty IR-4 crop safety and efficacy trials were initiated on container grown ornamentals in 2007. 4.Accomplishments Collected data to support new herbicide registrations in ornamentals. Identified and developed new weed control tools in ornamental crops, which are often hand-weeded at considerable expense due to the lack of registered and effective herbicides. These data will contribute to establish new registrations for 5 herbicides based on 50 ornamental field trials. Completed trials include sulfentrazone, dimethenamid-p, dimethenamid-p plus pendimethalin, mesotrione, and imazasulfuron herbicides that were tested on 18 plant species (Douglas fir, rose, feather reed grass, blue fescue, silver grass, creeping phlox, tickseed, Western red cedar, Western hemlock, dianthus, speedwell, periwinkle, pincushion flower, Fraser fir, gaura, perennial phlox, purple coneflower, and salvia). The completed research will support new registrations of these herbicides in the tested ornamental crops. NP 304 Crop Protection and Quarantine, Component VIII - Chemical control of weed, A. Herbicide Use in Minor Crops. 5.Significant Activities that Support Special Target Populations None. 6.Technology Transfer Number of new CRADAs and MTAs 1 Number of non-peer reviewed presentations and proceedings 25