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United States Department of Agriculture

Agricultural Research Service

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Location: Horticultural Crops Research

2011 Annual Report

1a. Objectives (from AD-416)
1. Develop and assess new controls for perennial weeds in cranberry beds. 2. Develop and assess controls for blackvine weevil in cranberry beds. 3. Assess organophosphate alternatives for insecticide management on cranberry beds.

1b. Approach (from AD-416)
Field trials will be implemented across numerous growers’ cranberry beds infested with yellow loosestrife (Lysimachia terrestris). Trials will consist of mesotrione, rimsulfuron and quinclorac applied alone and in all herbicide combinations. Research will be conducted to assess adulticides and larvicides for the control of blackvine weevil. Adulticides - each treatment will be applied at the first sign of adult emergence. Larvicides - treatments will be applied to weevil-infested cranberry beds at the end of egg laying in August. Research will be conducted to assess if any of the new alternative insecticide chemistries are as effective for fireworm control as organophosphates when applications are made via chemigation. Documents Grant with Washington State University. Formerly 5358-22000-032-15G (12/10). Formerly 5358-22000-036-04G (8/2011).

3. Progress Report
Results on herbicide screening trials in 2011 indicate that one new herbicides has registration potential for cranberries, as it had both efficacy and crop safety, and had registrant support. Two previously tested herbicides, rimsulfuron and quinclorac, have been tested on additional weeds. A Section 18 was submitted for quinclorac and an IR4 project was initiated on rimsulfuron. Research trials in OR and WA on our main target weed, Lysimachia terrestris, showed complete control with one to two applications of rimsulfuron, or quinclorac, or a combination of chlorimuron + mesotrione. Crop yield and efficacy data will continue to be collected for the year after treatment. Fast progress toward industry utilization of these chemistries is occurring. The project was monitored by meetings, e-mail, and phone calls.

4. Accomplishments

Last Modified: 10/17/2017
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