Barley Yield as Affected by Weeds and and Grasshoppers in Interior Alaska. (C03-begna368411-poster)
Authors:
S.H. Begna* - USDA-ARS D.J. Fielding - USDA-ARS
Abstract:
A field experiment was conducted to study the response of barley yield to stress associated with weeds and grasshopper defoliation in Interior Alaska in 2002. Weed factors (weed-free and weedy-with naturally occurring weeds) and 4 grasshopper densities (0, 25, 50, and 75 grasshoppers m-2), as sub-plot (sub-factor), were set (caged). A greater grain yield reduction due to grasshopper defoliation occurred under weed-free than weedy conditions, and this was in part due to grasshoppers feeding on weeds. Grain yield reduction was attributed not only to shortage of assimilates reaching the sink-grain but also to hanging and clipped heads caused by grasshoppers with potential not to be harvestable.
However, seed numbers head -1 were not or little affected by both weeds and grasshopper defoliation.
Although the effect of weeds on grain yield was lower than grasshopper defoliation, with greater weed stress than the one we had in this study, both weeds and grasshopper defoliation (i.e. heavy defoliation) may have the potential to reduce grain yield of barley under Alaskan condition.
Speaker Information: Sultan Begna, USDA-ARS, Sultan H. Begna USDA-ARS PO.Box 757200 Universi, Fairbanks, AK 757200; Phone: 907-474-7628; E-mail: [email protected]
Session Information: Tuesday, November 4, 2003, 4:00 PM-6:00 PM Presentation Start: 4:00 PM (Poster Board Number: 534)
Keywords: Barley-yield; Weeds; Grasshoppers; Alaska
