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Effect of Temperature on Termination of Diapause in Larvae of Laspeyresia strobilella (L.) (Lep., Tortricidae)

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image of Insect Systematics & Evolution

Diapausing larvae of Laspeyresia strobilella from cones of Ficea abies were kept individually in glass tubes. Parts of the material were stored under outdoor conditions and transferred to 22°C at different dates during the winter. Others were kept at different constant temperatures from October. In October diapause was determined in I0 % and in December in the entire population of larvae stored outdoors. The time required for termination varied considerably within the population in late fall, whereas the population was homogeneous concerning this characteristic in early spring. Only a few larvae kept at I8° and 22°C constant temperature terminated the diapause, whereas all, except those which were sick or in prolonged diapause, terminated at I5°, I2°, and 9°C after varying periods of time.

Affiliations: 1: Norwegian Forest Research Institute, I432 Vollebekk, Norway


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