Abstract
The variations in weight, water content and supercooling point (SCP) were studied in Tineola bisselliella at different stages in its development. The egg, with a fresh weight of 0.037 mg and a water content of 314% of the dry weight, is the stage most resistant to freezing with an SCP of −23 °C. The young larva (second instar), with a fresh weight of 2.5 mg and a water content of 145% of the dry weight, is the least resistant stage with an SCP of −13 °C. Despite the large differences in weights and water contents between males and females, they have the same SCP value of −19 °C. Because of the large individual variations observed in this species, it appears necessary to treat infested materials with a temperature lower than or equal to −29 °C to destroy all stages of development promptly.
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