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Hot-water immersion quarantine treatment for guavas infested with Caribbean fruit fly (Diptera: Tephritidae)

Gould, W.P., Sharp, J.L.
Journal of economic entomology 1992 v.85 no.4 pp. 1235-1239
Psidium guajava, Anastrepha suspensa, guavas, hot water treatment, insect control, mortality, quarantine, crop quality, import policies, Florida
Hot-water immersion was tested as a potential commodity treatment for guavas infested with third instars of the Caribbean fruit fly, Anastrepha suspensa (Loew). Infested guavas were immersed in water at 46.1 +/- 0.5 degrees C for various time periods. Probit 9 (99.9968%) mortality was estimated to occur at 32.7 min. A large-scale test with 2,450 guavas containing an estimated 181,556 larvae treated fat 35 min at 46.1 +/- 0.5 degrees C produced no survivors. Hydrocooling guavas immediately after hot-water treatment until fruit center temperatures returned to 24 +/- 2 degrees C did not significantly affect mortality. Guavas tolerated 35 min at 46.1 +/- 0.5 degrees C with only slight reduction in quality. Treated guavas held at 10 +/- 0.5 degrees C maintained acceptable quality 7 d longer than guavas held at 24 +/- 2 degrees C.