บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Alternative non-chemical quarantine treatment of cherries using 915 MHz microwaves: temperature mapping, codling moth mortality and fruit quality.

Ikediala, J. N.; Tang, J.; Neven, L. G.; Drake, S. R.;

ASAE Annual International Meeting, Orlando, Florida, USA, 12-16 July, 1998. Year: 1998 Pages: 15 pp. Ref: 38 ref.

1998

บทคัดย่อ

Alternative non-chemical quarantine treatment of cherries using 915 MHz microwaves: temperature mapping, codling moth mortality and fruit quality.

The heating characteristics of Bing and Rainier sweet cherries (Prunus avium) were determined experimentally in a pilot scale 915 MHz microwave with multimode oven cavity. Cherries infested with 3rd-instar larvae of codling moth (Cydia pomonella) were heated for different times equivalent to reaching an average pit temperatures of 45, 50 and 55 deg C, held for 2 minutes followed by 5 minutes of hydrocooling. Mortality was analysed after the treatment and after 1-2 days in cold storage. Fresh cherries were also given the same microwave heat treatment as infested cherries and some quality parameters were monitored over a period of 2 weeks in storage at 1 deg C. The 915 MHz microwave heating pattern showed that the pit heated faster than the cherry surface. Furthermore, larger cherries heated more quickly than smaller ones. Temperature increase was linear with time, and heating rate depended on the microwave power level, sample weight and radial location inside cherries. Adjusted percentage mortali

ty ranged from 5-62 and 39-98% without and with 1-2 days cold storage, respectively. A higher mortality rate was obtained for Bings than Rainiers. Firmness, percentage soluble solid content, titratable acidity, fruit weight, objective fruit colour and stem colour were also determined. Results from these quality parameters were compared with the control and commercial treatment with methyl bromide (MeBr) fumigation. Mean values of these properties compared well with the control and MeBr treatment, except that stem greenness colour was significantly (<0.05) reduced with the microwave treatment. Microwave energy may offer a good non-chemical quarantine treatment alternative against codling moth of postharvest cherries for export, but a more systematic study is needed to optimize the treatment protocol for insect control and fruit quality.