| Abstract Detail
Plant Protection Clough, George [1], Debano, Sandra [2], Hamm, Philip [3]. Reducing Tuber Damage from the Potato Tuberworm with Cultural Practices. CULTURAL treatments and combinations were evaluated for effect on foliar damage and tuber infestation by potato tuberworm (Phthorimaea operculella), a new pest in the region. One study examined the preharvest interval between initial application of insecticides and vine kill to determine how early to implement a program to control PTW tuber damage. Esfenvalerate, methamidophos, and methomyl were applied at recommended intervals, with programs beginning 5 to 28 days prior to vine kill. Indoxacarb was applied post vine-kill as a chemigation treatment. All insecticide treatments significantly reduced tuber damage as compared to the control, but there was no apparent advantage to beginning control efforts earlier in the season versus later. Another study examined effect of green foliage and increased soil moisture on PTW tuber damage. Russet Norkotah and Russet Burbank received either no irrigation or were irrigated with 0.10 inches daily from vine kill until harvest; plants were allowed to naturally senesce or were chemically defoliated. Tuber damage was similar between varieties, but daily irrigation following vine kill reduced tuber damage, and chemical vine kill tended to reduce tuber damage as compared to natural senescence. Also, five desiccants with rates of vine-killing ranging from hours to weeks were examined, with and without weekly application of methamidophos beginning 21 days before vine kill. Insecticide application reduced foliage and tuber damage with or without chemical vine desiccation. However, tuber damage with the slowest acting desiccant was less without insecticide application than with. With insecticide applications, the faster-acting the desiccant, the less the tuber damage.
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1 - Oregon State University, Department of Horticulture, Hermiston Agricultural Research & Extension Center, PO Box 105, Hermiston, Oregon, 97838, USA
2 - Oregon State University, Department of Fisheries & Wildlife, Hermiston Agricultural Research & Extension Center, PO Box 105, Hermiston, Oregon, 97838, USA
3 - Oregon State University, Hermiston Agricultural Research and Extension Center, P.O. Box 105, Hermiston, Oregon, 97838, USA
Keywords:
irrigation
insecticide timing
desiccation
senescence.
Session: PAA03-6
Location: Hall of Ideas Room E/Monona Terrace
Date: Thursday, July 27th, 2006
Time: 9:45 AM
Abstract ID:282 |
