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Title:   Author  item
                                            WIERSMA, JOCHUM - UNIV. OF MNitem
                                            Archer, Daviditem
                                            Forcella, Frankitem
                                            DURGAN, BEVERLY - UNIV. OF MNitem
                                            Eklund, Jamesitem
                                            MARTINSON, KRISHONA - UNIV. OF MN
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 2/10/2005
                                    Publication  Date: 2/10/2005
                                    Citation: Wiersma, J.J., Archer, D.W., Forcella, F., Durgan, B.R., Eklund, J.J., Martinson, K. 2005. Validation of WheatScout decision aid for integrated management of grass weeds in spring wheat [abstract]. Weed Science Society of America. 45:80.Interpretive Summary:
                                Technical Abstract: The purpose of the WheatScout software is to aid weed management decisions to control green foxtail and wild oat (Setaria viridis and Avena fatua) in hard red spring wheat (Triticum aestivum L). The software generates biological, management, and economic information to aid the decision making process. Biological information generated by WheatScout includes: (a) emergence timing and leaf-stage development of weed and wheat, (b) weed/crop interference, and (c) weed seed production as functions of weed density and herbicide rate. Management information includes: (a) herbicides appropriate for specific plant growth stages, (b) herbicide dose-responses for each labeled graminicide, and (c) effects of delayed herbicide application on herbicide efficacy. Economic information provides net returns for each potential herbicide, including those for a range of reduced application rates at the current scouting date as well as at future evaluation dates. The objective of this research was to validate the output of the WheatScout model with actual data collected in field experiments. For this purpose, three experimental sites were established in Crookston, Morris and Rosemount, MN, in 2004. The three sites were selected to represent three different weed population scenarios. In Crookston, MN, wild oat was the predominant species, while green foxtail predominated at Rosemount, MN. The Morris, MN, site had a mixed population of both green foxtail and wild oat. To validate the biological information generated by WheatScout, daily minimum and maximum air temperature and the amount of precipitation was recorded at each location and used as meteorological input to the WheatScout model. In addition, time of emergence, growth stage and density of the green foxtail and/or wild oat was recorded at seven day intervals. To validate the management and economic information generated by WheatScout four common graminicides were applied at the labeled and one-half of the labeled rate at two different growth stages of hard red spring wheat using a randomized complete block design with 3 replicates at each site. Data will be presented in which the output generated by the WheatScout model is compared to the data collected in the field experiments for each of the three sites.


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