Cherry Irradiation Studies. 1984 annual report

‘Bing’ and ‘Rainier’ sweet cherries were irradiated at doses of 0.00, 0.15, 0.30, 0.60 and 0.90 kGy using a linear accelerator. Cherries were evaluated for quality immediately after treatment and again after 14 days storage at 1C. No variation in soluble solids, titratable acidity or flavor were noted at any of the irradiation doses. Defects were increased for ‘Rainier’ cherries at irradiation doses above 0.60 kGy, but no change in defects of ‘Bing’ cherries were present regardless of irradiation doses. Objective color of ‘Bing’ cherries was lighter with more red at irradiation doses greater than 0.30 kGy, but this change in color was not evident visually. Objective color of ‘Rainier’ cherries was reduced at irradiation doses of 0.60 kGy and greater. This reduction in ‘Rainier’ red color was evident visually at an irradiation dose of 0.90 kGy. No change in ‘Bing’ green stem color was evident, but ‘Rainier’ stem color improved at irradiation doses above 0.60 kGy. Firmness of both ‘Bing’ and ‘Rainier’ cherries was reduced at irradiation doses of 0.60 kGy and greater. By using the linear accelerator at doses of 0.60 kGy or less, ‘Bing’ and ‘Rainier’ cherries can be irradiated with no major quality loss to meet quarantine requirements.

Section: Introductionmentioning

confidence: 99%

Quality Response of ?Bing? And ?Rainier? Sweet Cherries to Low Dose Electron Beam Irradiation

Drake

Neven

1997

LOW DOSE IRRADIATION of 'RAINIER'SWEET CHERRIES AS A QUARANTINE TREATMENT

Drake¹,

Moffitt²,

Eakin³

1994

Self Cite

Rainier' cherries, with and without gibberellic acid treatment were subjected to radiation at dose levels of 0.0, 0. 1, 0.2, 0.3, 0.4, 0.5, and 1.0 KGy and held for 14 and 21 days at 1C before removal from storage and quality determined. No variation in fmit or stem color, soluble solids. titratable acidity or sensory difference was noted at any of the radiation dose levels. There was 13% loss in firmness due to radiatlon treatment between 0.4 and 1.0 KGy. Cherries that were treated with gibberellic acid were superior candidates for radiation treatment. 'Rainier' cherries can be irradiated as soon as quality parameters have reached acceptable levels for commercial harvest.

RESPONSE of APPLE and WINTERPEAR FRUIT QUALITY to IRRADIATION AS A QUARANTINE TREATMENT

Drake

Sanderson

Neven

1999

Irradiation at doses between 0.30 and 0.90 kGy reduced apple firmness. Doses of <0.30 kGy had no efect on apple firmness. Firmness lost due to irradiation was cultivar dependent. Titratable acid@ (TA) of 'Gala' apples was reduced at irradiation doses of 0.60 kGy and above. No los,s of TA due to the irradiation dose was evident, for 'Fuji' or 'Granny Smith' apples. Irradiation did not influence the external color of apples, but change in the internal color of 'Gala' and 'Granny Smith' apples due to irradiation exposure was present. 'Bosc pears lost frrmness due to irradiation, and the firmness loss was dose dependent. Both, 'Anjou ' and 'Bosc ' ripened normal'& after irradiation exposure. There was an increase in scald for 'Anjou ' that was dose dependent. Disease incidence of 'Fuji' and 'Granny Smith' apples caused by P. expansum was reduced ,from about 80% of wounds with lesions to 30% after irradiation exposure. Irradiation had no effect on number of lesions caused by either €3. cinerea or M. piriformis. N o effect was observed on decay of 'Anjou' pear fruit naturally infected with P. expansum and B. cinerea. However, a reduction in decay was observed in naturally infected 'Bosc ' pear fruits treated with 0.90 kGy.