Commercially ripe peaches were wounded and co-inoculated with phylloplane isolates ofPseudomonas syringae(MA-4 and NSA-6),Pseudomonas fluorescens(BAP-3), or an isolate ofCandidasp. (NSD-4) in combination with either conidia ofMonilinia fructicola(cause of brown rot) or sporangiospores ofRhizopus stolonifer(cause of rhizopus rot). Isolates NSA-6 and MA-4 at a concentration of 1 x 107CFU/mL reduced brown rot to 28 and 73, respectively, from 98 in the inoculated check after 5 days incubation at 22#xB0;C. Both isolates reduced rhizopus rot to 5 and 8 from 53 in the inoculated check after 5 days incubation. TheP. syringaeisolates when used in 2-min soak treatments were less effective against natural, preharvestM. fructicolainfections of late-harvested peaches. Isolates MA-4 and NSA-6 suppressed brown rot from 63 to 30 and from 95 to 71-81, respectively, after 3 and 4 days incubation at 22#xB0;C. The use of 0.5 CaCl2in the soak suspension significantly improved the activity ofP. syringaebut the use of #x201C;peach wax#x201D; (Decco 282) increased brown rot incidence and negated the beneficial effect of CaCl2.
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