Radio frequency heating: a new potential means of post-harvest pest control in nuts and dry products.
The multi-billion dollar US tree nut industries rely heavily on methyl bromide fumigation for postharvest insect control and are facing a major challenge with the mandated cessation by 2005 of its use for most applications. There is an urgent need to develop effective and economically viable alternative treatments to replace current phytosanitary and quarantine practices in order to maintain the competitiveness of US agriculture in domestic and international markets. With the reliable heating block system, the thermal death kinetics for fifth-instar codling moth, Indianmeal moth, and navel orangeworm were determined at a heating rate of 18 degrees C/min. A practical process protocol was developed to control the most heat resistant insect pest, fifth-instar navel orangeworm, in in-shell walnuts using a 27 MHz pilot scale radio frequency (RF) system. RF heating to 55 degrees C and holding in hot air for at least 5 min resulted in 100% mortality of the fifth-instar navel orangeworm. Rancidity, sensory qualities and shell characteristics were not affected by the treatments. If this method can be economically integrated into the handling process, it should have excellent potential as a disinfestation method for in-shell walnuts.
Wang
Shao-jin
SJ
Department of Biological Systems Engineering, Washington State University, Pullman 99164-6120, USA. shaojin_wang@wsu.edu
Tang
Ju-ming
JM
D000818:Animals; D000845:Annelida / Q000502:physiology / Q000528:radiation effects; D004307:Dose-Response Relationship, Radiation; D005506:Food Contamination / Q000517:prevention & control; D005511:Food Handling / Q000295:instrumentation / Q000379:methods*; D006358:Hot Temperature; D007300:Insect Control / Q000295:instrumentation / Q000379:methods*; D007313:Insecta / Q000502:physiology / Q000528:radiation effects*; D031324:Juglans / Q000469:parasitology* / Q000528:radiation effects*; D009036:Moths / Q000502:physiology / Q000528:radiation effects; D011829:Radiation Dosage; D011846:Radio Waves; D013242:Sterilization / Q000295:instrumentation / Q000379:methods*; D016019:Survival Analysis