The occurrence of an adult reproductive diapause in the univoltine life cycle of the beech leaf mining weevil,Rhynchaenus fagiL.

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Abstract
The annual cycle of reproduction of Rhynchaenus fagi was found to involve a female reproductive diapause of the short day-long day type. Males were sexually mature soon after emergence. The diapause was terminated by 8–12 weeks of a short day followed by 4 weeks of a long day; weevils were not sensitive to the treatment immediately after emergence. Diapause ended in the field in mid-March but was terminated in the laboratory two months earlier. The diapause condition synchronized egg development with the new growth of beech leaves.