บทคัดย่องานวิจัย

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The control of stored-product insects and mites with extreme temperatures.

Fields, P. G.;

Journal of Stored Products Research Year: 1992 Vol: 28 Issue: 2 Pages: 89-118 Ref: many ref.

1992

บทคัดย่อ

The control of stored-product insects and mites with extreme temperatures.

Heating or cooling is used extensively to control stored-product insect and mite pests. For most stored-product insects, 25-35 deg C is optimal for growth and reproduction, at 13-25 or at 33-35 deg C insects are able to complete their development and produce offspring, but at <13 or >35 deg C insects eventually die. The more extreme the temperature the more quickly insects die, with death occurring in a few minutes at -20 or 55 deg C. Lethal temperatures vary considerably and depend on species, stage of development, acclimation and relative humidity. Extensive tables listing the survival of the major stored-products insects and mites at extreme temperatures from over 50 papers is presented. There are many ways to cool the commodity: turning, aeration or refrigerated aeration, or to heat the commodity: infrared, microwaves, high frequency irradiation, or hot air in fluidized-bed. Some of these processes are available commercially, while others have been tested only in the laboratory. The proposed behavioural, physiological and biochemical mechanisms that enable stored-product insects to survive extreme temperatures are reviewed. Possible synergists that might make stored-product insects more susceptible to extreme temperatures are suggested. One example is the use of ice-nucleating active bacteria to increase the supercooling points of insects, thereby making them less cold-hardy. The supercooling points of 4 beetles were measured and compared to published data for other stored-product insects. A standard protocol for examining the survival of stored-product insects at extreme temperatures is outlined.