Progress 05/01/02 to 12/31/05
Outputs
Progress Report 4d Progress report. This report serves to document research conducted under a trust fund agreement between ARS and the Washington Tree Fruit Research Commission. Additional details of research can be found in the report for the parent project 5350-43000-004-00D, Quality enhancement, storage optimization and loss reduction for increased marketability of deciduous tree fruits. Scald and decay control are the major problems associated with the long- term storage of 'd'Anjou' pears. In this study, 'd'Anjou' pears were drenched with various combinations of fungicides [Scholar (fludioxinil), Penbotec (pyrimethanil) and Mertect (thiabendazole)], and anti- scald agents (ethoxyquin and diphenylamine) alone or in combination and fruit quality was evaluated after long-term controlled atmosphere storage. Decay incidence was insignificant regardless of fungicide use. Ethoxyquin reduced scald incidence and contributed to improved scores for finish and pedicel
condition. Diphenylamine treatment also reduced scald development.
Impacts
(N/A)
Publications
|
Progress 10/01/04 to 09/30/05
Outputs
4d Progress report. This report serves to document research conducted under a trust fund agreement between ARS and the Washington Tree Fruit Research Commission. Additional details of research can be found in the report for the parent project 5350-43000-004-00D, Quality enhancement, storage optimization and loss reduction for increased marketability of deciduous tree fruits. Scald and decay control are the major problems associated with the long- term storage of dAnjou pears. In this study, dAnjou pears were drenched with various combinations of fungicides [Scholar (fludioxinil), Penbotec (pyrimethanil) and Mertect (thiabendazole)], and anti- scald agents (ethoxyquin and diphenylamine) alone or in combination and fruit quality was evaluated after long-term controlled atmosphere storage. Little decay was evident with or without the use of fungicides, but scald was a major problem after long-term storage. Ethoxyquin reduced scald incidence to acceptable levels but
stimulated the severity of phytotoxicity. However, when fruit were evaluated by quality control personnel, phytotoxicity did not represent a major issue, and the amount of scald present was within reason. In some instances, ethoxyquin treatment enhanced sensory scores for finish and pedicel condition, improving fruit grade. In this study, scald control was better for ethoxyquin compared to diphenylamine. Diphenylamine is not registered for use on pears at the present time. However, diphenylamine did produce acceptable scald control even though it aggravated phytotoxicity. Diphenylamine might be considered for future use as a scald control agent for pears. dAnjou pears packed in boxes with ethoxyquin and Cu paper wraps developed less decay and scald than pears in poly bags. If pears are to be packed in poly bags after bin storage, additional means of decay and scald prevention need to be employed.
Impacts
(N/A)
Publications
|
Progress 10/01/03 to 09/30/04
Outputs
4. What were the most significant accomplishments this past year? This report serves to document research conducted under a trust fund agreement between ARS and the Washington Tree Fruit Research Commission. Additional details of research can be found in the report for the parent project 5350-43000-003-00D, Enhance market quality, reduce postharvest loss and increase utilization of deciduous tree fruits. 'd'Anjou' pears wrapped in paper containing either 3, 6, or 9% oil with Cu & E (Copper & Ethoxyquin) or Biox A or E, packed after harvest and stored in regular atmosphere and controlled atmosphere storage, for periods not exceeding 120 days, maintained good quality. Storage of pears in paper containing diphenylamine (DPA) produced acceptable scores for appearance and finish, but some superficial scald occurred. Use of DPA, or DPA + Cu, in the paper wrap beyond 120 days of storage resulted in excessive damage in the form of scald. Quality of pears in wraps
containing organic oils (lemon, clove, citronella) was approximately equivalent to use of dry paper and did not meet the quality of the industry standard wrap (3% oil + Cu & E). If pears are to be held in long-term CA storage (210 days), only paper wraps containing 3 or 6% oil + Cu & E should be considered. Pears wrapped in paper containing organic compounds do not maintain acceptable quality. Use of paper impregnated with organic compounds cannot be recommended, particularly when compared to the quality of pears wrapped in paper containing chemical compounds. This project supplements the research of the Inhouse Project as the use of paper wraps reduces postharvest losses of 'd'Anjou' pears and enhances acceptance of the product.
Impacts
(N/A)
Publications
|
|