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Title:   Author  item
                                            Krause, Charlesitem
                                            Derksen, Richarditem
                                            Horst, Leonaitem
                                            ZONDAG, R. - OSU EXTENSIONitem
                                            Brazee, Rossitem
                                            Klein, Michaelitem
                                            Reding, Michael

                                                         - *Mike*
  Submitted to: Extension Circular
                                    Publication Type: Experiment Station
                                    Publication Acceptance Date: 12/1/2002
                                    Publication  Date: 1/21/2003
                                    Citation: Krause, C.R., Derksen, R.C., Horst, L., Zondag, R., Brazee, R.D., Klein, M.G., Reding, M.E. 2003. The Effects of Sprayer Configuration on Efficacy for the Control of Scab on Crabapple. Extension Circular. 189:65-68Interpretive Summary:
                                Technical Abstract: Direct evaluation and correlation of fungicide coverage, and the amount of apple scab disease were investigated relative to the effects of sprayer/nozzle.  Dedicated nursery plots consisted of 6 crabapple treatment rows with 4 replications each.  Crabapple whips of each cultivar, Malus spp. cv. `Candied Apple' and cv. `Red Jade' were used with barrier rows.  Treatments consisted of:  an axial flow, airblast sprayer with conventional-high volume nozzle delivering 300 psi; an axial flow, airblast sprayer applied treatments of mankocide fungicide spray with air induction nozzles delivering 120 psi; an experimental air curtain sprayer or cross-flow fan sprayer with air induction nozzles delivering 120 psi; and an unsprayed control.  Leaf analysis was performed using a cold field emission scanning electron microscope and a variable pressure scanning electron microscope, both equipped with energy dispersive x-ray analyzers to directly visualize and identify the pathogens and morphologically and chemically characterize any fungicide present.  Disease evaluation was made using a Horsfall-Barrett Scale read each month during spray treatments.  A portable meteorological station monitored weather conditions within the experimental plot.  Fungicide coverage was measured with EBA, but low disease pressure did not permit quantifying differences in efficacy.


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