Effect of DPA reapplication by thermofogging on scald control in apples
C. Moggia, J.A. Yuri, M. Pereira and R. Carpentier
ISHS Acta Horticulturae 857:273-280. 2010.
2010
บทคัดย่อ
Trials were conducted during three seasons (2001–2004) to determine optimal timing for a second DPA application, for control of superficial scald on apples (Malus ×domestica Borkh.) and to evaluate the use of thermofogging for this purpose. ‘Granny Smith’, ‘Fuji’ and ‘Braeburn’ apples from commercial orchards were treated with DPA at harvest and after 2, 3, 4 or 6 months of storage in either regular air (RA, 0°C) or controlled atmosphere (CA, 1.8–2% O2 and 1.3–1.5% CO2) storage. Initial DPA treatment was applied immediately after harvest by drenching, thermofogging or dipping. DPA reapplications were done by thermofogging (in refrigerated trailers and commercial CA storerooms) or dipping. Scald incidence (%) and severity was evaluated, at 6 or 8 months after harvest and plus 10 days at room temperature. Samples were drawn periodically for DPA residue analyses. At harvest and monthly thereafter, evolution of scald related compounds (α -farnesene, conjugated trienes and antioxidant capacity) were analyzed. Reapplication of DPA was consistently effective at reducing scald development, especially in susceptible fruit and when applied after two or three months of storage. Scald incidence on ‘Granny Smith’ and ‘Fuji’ apples was associated with