Efficacy of vapor heat treatment on sweet potato infested with sweet potato weevil, Cylas formicarius (Fabricius) (Coleoptera: Brentidae), west indian sweet potato weevil, Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae), and sweet potato vine borer, Omphisa anastomosalis Guenee (Lepidoptera: Pyralidae)
1997
Shimabukuro, S. (Japan. Ministry of Agriculture, Forestry and Fisheries, Naha. Naha Plant Protection Station) | Ishikawa, A. | Iwata, M. | Sakaguchi, T. | Makiguchi, S. | Katsumata, H.
Tested were mortality of Sweet Potato Weevil (SPW), Cylas formicarius (Fabricius), West Indian Sweet Potato Weevil (WISPW), Eucepes postfasciatus (Fairemaire) and Sweet Potato Vine Borer (SPVB) Omphisa anastomosalis Guenee, infesting in Sweet potato, Ipomoea batatas L., and thermal injuries on or in sweet potato by Vapor Heat Treatment. Above three species were treated by forced air of single-temperature at 48 degrees C with saturated vapor (94% R.H.). After sweet potato temperature (at innermost part) reached 47 degrees C, no survivors were observed in SPW, WISPW, and SPVB treated for 150, 60, and 90 minutes respectively. On the other hand, the single-temperature treatment (STT) of 47 degrees C - 150 min. promoted the rot of sweet potato stored for 2 weeks after treatment. The rot of sweet potato was supersede by incremental-temperature of the air from 31 to 41 degrees C for 240 minutes with saturated vapor prior to STT of 47 degrees C - 150 minutes. However, survivors of SPW pupae were found in incremental-temperature treatment (ITT) plus STT of 47 degrees C - 150 minutes ITT might give adverse affect on the mortality expected in following STT. When the holding time in STT prolonged to 190 minutes (ITT plus STT of 47 degrees C - 190 minutes), 59, 154 SPW pupae were killed in large scale test. Also no injuries were occurred on or in sweet potato in ITT plus STT of 47 degrees C - 190 minutes
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