Jointed goatgrass : outcrossing, competition with winter wheat, and response to timing and rate of imazamox Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/fq977x067

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  • Jointed goatgrass (Aegilops cylindrica Host.) is a serious weed problem in wheat (Triticum aestivum L.) production in the United States. Studies were conducted to determine the outcrossing rate, competitive ability, and effectiveness of certain control practices on jointed goatgrass. A field study was conducted over two years at four locations to determine outcrossing rates of four jointed goatgrass populations. There were no differences in outcrossing rates among the four populations. In the first year of the study, outcrossing was not different at any of the sites and averaged 1.28%. In the second year, outcrossing ranged from 0.38% to 2.24%. Outcrossing rates also were measured for wheat. Wheat outcrossing average was 0.09%, but rates ranged from 0% to 0.30%. A second study compared the competitive ability of plants derived from seed from the primary and secondary floret position within jointed goatgrass spikelets with winter wheat. This study consisted of three replacement series experiments that included pairwise combinations of the three plant types grown in five planting ratios. Jointed goatgrass plants from the seed in the secondary floret position were equally competitive with winter wheat and more competitive than plants from seed in the primary floret position. A third study was conducted to determine the effect of rate and timing of imazamox application on jointed goatgrass and imidazolinone-resistant wheat. At earlier timings, there was no difference in jointed goatgrass response to different herbicide rates. Wheat response was affected by herbicide rate at all application times. Pre-emergent herbicide treatments did not affect either species. When grown in 50:50 mixtures, final dry weights of jointed goatgrass and wheat were not affected by herbicide rate at either the early or late application time.
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