Canadian Forest Service Publications
The nature of cysts found in pupae and adults of Neodiprion swainei. 1968. Smirnoff, W.A. The Canadian Entomologist 100(3): 313-318.
Issued by: Laurentian Forestry Centre
Catalog ID: 16026
Availability: PDF (request by e-mail)
The cysts sometimes observed in the intestinal cavity of pupae and in the abdominal cavity of adults of Neodiprion swainei Midd. are not typical tumors. No cell proliferations were observed but rather a precipitation of the cells that accumulated and formed a membrane composed of many layers. The cysts appear to result from encapsulation of incompletely lysed or unlysed cells of the midgut epithelium. They are not necessarily the result of a viral infection.