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New Zealand Plant Protection 68 (2015): 451

Ovarian development in Arhopalus ferus (Coleoptera: Cerambycidae)

A.M. Barrington and D.P. Logan

ABSTRACT

Burnt pine longhorn (BPL) Arhopalus ferus Burnt pine longhorn (BPL) Arhopalus ferus (Mulsant) (Coleoptera: Cerambycidae) is an introduced species sometimes found in association with export logs and sawn timber. In this study oocyte development was assessed at a constant 15, 20 and 25C, and behaviour was observed, with the aim of determining optimal mating age for laboratory-reared insects. At eclosion females were kept in 60 ml cups at 15, 20 and 25C with a strip of cardboard as a resting site and frozen at 4-, 3- and 2-day intervals, respectively, for dissection. At 15, 20 and 25C the first oocytes reached maximum length and were chorionated at ca 25, 12 and 10 days, respectively. Cardboard chewing was observed from ca 20, 10 and 8 days at 15, 20 and 25C, respectively. Chewing behaviour may mimic the wild adult clearing its exit hole before leaving the decaying tree, and corresponds with the approximate period that earliest oocytes have reached maximum size. Based on these results, the optimum time for pairing laboratory-reared adults kept at 20C is later than 10 days after eclosion. Subsequently adults reared at 20C and paired when they were 14-15 days old mated and began egg-laying immediately.

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