| Abstract Detail
Plant Protection Hamm, Philip [1], David, Nick [1], Clough, George [2], DeBano, Sandy [3]. Potential cultural methods to control potato tuberworm in the sandy soils of the Columbia Basin. RECENT confirmation of potato tuberworm (Phthorimaea operculella (Zeller) in the Columbia Basin of Oregon and Washington, a major potato producing region, is of great concern to the local potato industry. In California, the closest production area with tuberworm, tuber infestations were reduced by several methods including rolling hills just prior to vine-kill to remove tuber access via soil cracks. Similar control methods were tested in the Columbia Basin via two RCBD trials in 2004. In the first, treatments included: 1) chemical vine-kill only, 2) vine-kill followed by covering with soil, 3) vine-kill followed by rolling hills, and 4) vine-kill followed by insecticide application. In the second trial, four treatments compared: 1) vine kill only, 2) rolled, then vine killed, 3) green vines removed, immediately covered with soil, and 4) vine-kill followed by covering 3 days later. Tubers were harvested two weeks following vine-kill and evaluated for tuberworm infestation. In trial 1, only covering with soil (treatment 2) significantly reduced tuber infestation compared to the control (0 versus 10.5 %, respectively). In trial 2, covering treatments 3 (5.2%) and 4 (1.2%) significantly reduced infestation compared to the control (12.6%), and treatment 4 was better than treatment 3. A similar trial in 2005 was unsuccessful due to lack of tuber worm damage in any treatment. Rolling of potato hills in sandy soils may expose tubers and is not recommended in this area. Covering hills with soil provides good protection but must be done at vine-kill. This method poses serious field issues, however, related to moving soil in a timely, cost-effective manner over large potato fields.
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1 - Oregon State University, Botany & Plant Pathology, PO Box 105, Hermiston, OR, 97838, USA
2 - Oregon State University, Department of Horticulture, Hermiston Agricultural Research & Extension Center, PO Box 105, Hermiston, Oregon, 97838, USA
3 - Oregon State University, Department of Fisheries & Wildlife, Hermiston Agricultural Research & Extension Center, PO Box 105, Hermiston, Oregon, 97838, USA
Keywords:
tuber moth.
Session: PAA03-4
Location: Hall of Ideas Room E/Monona Terrace
Date: Thursday, July 27th, 2006
Time: 9:15 AM
Abstract ID:29 |
