ARS | Publication request: EFFECT OF APOGEE DOSE LEVEL ON FIRE BLIGHT SHOOT INFECTION IN YOUNG 'GALA' AND 'YORK' APPLE TREES

Submitted to: Annual Cumberland Shenandoah Fruit Workers Conference
Publication Type: Proceedings
Publication Acceptance Date: July 11, 2002
Publication Date: July 25, 2002
Citation: NORELLI, J.L., MILLER, S.S. EFFECT OF APOGEE DOSE LEVEL ON FIRE BLIGHT SHOOT INFECTION IN YOUNG 'GALA' AND 'YORK' APPLE TREES. ANNUAL CUMBERLAND SHENANDOAH FRUIT WORKERS CONFERENCE. Vol. 77, pgs 171-173, July 2002.

Technical Abstract: The objective of this research was to determine if the use of a reduced Apogee dose on young trees could provide significant fire blight protection without sacrificing tree growth. Three-yr-old 'Gala' and 'York' trees were either not treated, treated with a full rate of Apogee (an application of 250 mg /l prohexadione calcium followed by an application 125 mg /l prohexadione calcium), treated with a reduced dose of Apogee (5 applications of 63 mg /l prohexadione calcium), or treated with streptomycin. On 'Gala', the reduced dose of Apogee provided excellent control of shoot infection by Erwinia amylovora (92%) but also resulted in growth reduction equivalent to the full rate. On 'York' where the reduce dose of Apogee allowed for significantly more growth than the full rate, fire blight control was only 25%.