ISHS Acta Horticulturae 547: III International Symposium on Rose Research and Cultivation
GALLS INDUCED BY CYNIPID WASPS OF THE GENUS DIPLOLEPIS(Cynipidae, Hymenoptera) ON CULTIVATED SHRUB ROSES IN CANADA |
| Author: | J.D. Shorthouse |
| Abstract:
Four species of gall-inducing wasps of the genus Diplolepis, endemic to the wild roses of Canada, are established on cultivated Rosa rugosa and its hybrids in Canadian gardens. Two species, Diplolepis spinosa and D. radicum, have become pests, whereas D. rosaefolii and D. polita are less common and are not considered to be pests. R rugosa has become feral in eastern Canada and is commonly attacked by both D. spinosa and D. radicum. The European leaf gallers D. rosae, D. mayri and D. centifoliae have been accidentally introduced into Canada on their European hosts, R. canina and R. eglanteria, and are established on both garden and feral shrubs. This paper alerts rosarians to the concern of Diplolepis and their galls becoming pests, and the ease by which these insects can be transported great distances. | |
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