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Title:   Author  item
                                            UDOMPETAIKUL, V. - University Of Californiaitem
                                            COATES, ROBERT - University Of Californiaitem
                                            UPADHYAYA, SHRINIVASA - University Of Californiaitem
                                            Browne, Gregitem
                                            SHAFII, MIR - University Of Californiaitem
                                            GILLIS, MATT - Trical Inc
  Submitted to: California Agriculture
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 5/1/2013
                                    Publication  Date: 12/1/2013
                                    Publication URL: http://californiaagriculture.ucanr.org/landingpage.cfm?article=ca.v067n04p222&fulltext=yesCitation: Udompetaikul, V., Coates, R.W., Upadhyaya, S.K., Browne, G.T., Shafii, M., Gillis, M. 2013. Tractor-mounted, GPS-based spot fumigation system manages Prunus replant disease. California Agriculture. 67(4):222-227.Interpretive Summary:
                                Technical Abstract: Our research goal was to use recent advances in global positioning system (GPS) and computer technology to apply just the right amount of fumigant where it is most needed (i.e., in a small target treatment zone in and around each tree replanting site) to control Prunus replant disease (PRD). We developed and confirmed the function of (1) GPS-based software that can be used on cleared orchard land to flexibly plan and map all of an orchard's future tree sites and associated spot fumigation treatment zones and 2) a tractor-based GPS-controlled spot fumigation system to quickly and safely treat the targeted tree site treatment zones. In trials in two almond orchards and one peach orchard, our evaluations of the composite mapping and application system, which examined spatial accuracy of the spot treatments, delivery rate accuracy of the spot treatments, and tree growth responses to the spot treatments, all indicated that GPS spot fumigation has excellent potential to greatly reduce fumigant usage while adequately managing the PRD complex.


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