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The effect of cold treatment conditions on the pupation and emergence of the house longhorn beetle Hylotrupes bajulus (L.) (Col., Cerambycidae)

The induction of metamorphosis in Hylotrupes bajulus by cold treatment was investigated. Large larvae (weight 200–500 mg) were kept under the following conditions: group A: 100 days at 10°C; group B: 56 days at 5°C. Group A larvae emerged in shorter time after the termination of the cold treatment period and showed greater uniformity in emergence time as well as a higher proportion of metamorphosis. A greater proportion of the large larvae (> 400 mg) underwent metamorphosis. Female larvae were significantly larger than male larvae of the same age. In terms of mass rearing efficiency, cold treatment at 10 °C for 100 days is the preferred method.