NDLI: Pest control by microwave and radio frequency energy: dielectric properties of stone fruit

Content Provider	Springer Nature Link
Author	Ling, Bo Tiwari, Gopal Wang, Shaojin
Copyright Year	2014
Abstract	Current pesticides such as methyl bromide are progressively removed from the market due to harmful residues in food. The stone fruit industries are thus seeking alternatives for postharvest control of insect pests. Microwave and radio frequency methods hold potential for postharvest thermal disinfestations of stone fruits to replace chemical fumigation. Knowledge of dielectric properties is essential for understanding the interaction between the electromagnetic fields and the target stone fruits and designing treatment beds in industrial applications. Here, we determined the dielectric properties of nectarine, peach, and plum between 10 and 1,800 MHz over a temperature range of 20–60 °C using an impedance analyzer. Our results show that the dielectric constant generally varied between 60 and 75, accounting for changes of 8–10 % due to temperature effect. But, the loss factor decreased linearly with frequency on the log scale at all temperatures for three stone fruits. The loss factor of Mediterranean fruit fly, nectarine, peach, and plum increased about 106, 108, 110, and 64 %, respectively, when the sample temperature increased from 20 to 60 °C. The penetration depth in all stone fruits decreased with increasing frequency and temperature. The loss factor ratio at 27 MHz of Mediterranean fruit fly to nectarine, peach, and plum was 1.65, 1.66, and 1.87 at 20 °C, respectively, suggesting potential differential heating between insects and host stone fruits in radio frequency treatments.
Starting Page	233
Ending Page	240
Page Count	8
File Format	PDF
ISSN	17740746
Journal	Agronomy for Sustainable Development
Volume Number	35
Issue Number	1
e-ISSN	17730155
Language	English
Publisher	Springer Paris
Publisher Date	2014-04-30
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Paris
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dielectric properties Differential heating Disinfestations Open-ended coaxial probe Stone fruit Agriculture Soil Science & Conservation Sustainable Development
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Agronomy and Crop Science

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