Postharvest disinfestation of lightbrown apple moth and longtailed mealybug on persimmons using heat and cold
Peter R. Dentener, Keren V. Bennett, Lisa E. Hoy, Sonya E. Lewthwaite, Philip J. Lester, John H. Maindonald and Patrick G. Connolly
Postharvest Biology and Technology Vol: 12 Issue: 3 Pages: 255-264
1997
บทคัดย่อ
The effect of temperature on the mortality responses of fifth instar lightbrown apple moth (Epiphyas postvittana Walker) and longtailed mealybug (Pseudococcus longispinus Targioni-Tozetti) on `Fuyu' persimmons was examined at temperatures between 44 and 50°C (hot air), and 0 and 7°C (cold storage). P. longispinus was more tolerant than E. postvittana to heat treatments but tolerance was opposite in cold storage. For both species, cold storage following heat treatment allowed a reduction in time of heat treatment required for a predicted 99% mortality level. This effect was most apparent at 0°C and less with higher cold storage temperatures. E. postvittana was more tolerant than P. longispinus to the combination treatment. An estimated treatment time of 3.3 h (including a 2 h warming-up period) at 44°C, followed by 40 days cold storage at 0°C was needed to achieve 99% mortality of E. postvittana. Time required to give 99% mortality decreased with increasing high temperature to about 2.6 h (including a 2 h warm-up period) at 50°C, followed by similar cold storage conditions. Treatment for 5 h at 47°C followed by cold storage at 0°C may delay chilling injury in persimmons while causing only minor levels of heat injury to the fruit. A combined heat/cold storage treatment may therefore be effective for disinfestation of E. postvittana and P. longispinus on persimmons.