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Biology and Immature Stages of Dectes sayi Dillon and Dillon (Coleoptera: Cerambycidae)

Gary L. Piper
The Coleopterists Bulletin
Vol. 32, No. 4 (Dec., 1978), pp. 299-306
Stable URL: http://www.jstor.org/stable/3999940
Page Count: 8
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Biology and Immature Stages of Dectes sayi Dillon and Dillon (Coleoptera: Cerambycidae)
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Abstract

The life cycle of Dectes sayi Dillon and Dillon, a cerambycid associate of common ragweed, Ambrosia artemisiifolia L., is discussed. Adults began appearing in early July with peak populations emerging in mid-August. Eggs are deposited singly in the pith of primary and secondary stems. First to fourth instars bore into and feed upon the pith from late July to late October. Mature or nearly mature larvae overwinter in a diapause state within a specially prepared chamber located in the rootcrown area of the stem. Pupation occurred during mid-summer within the chamber. The beetle is univoltine in northeastern Ohio. Diagnostic descriptions and/or illustrations of the immature stages are provided.

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