Pea Rose Gall
Diplolepis sp.
This leaf gall was observed along Sycamore Creek, Pine Mountain Wilderness, Yavapai Co., Arizona. 19 Sept. 2015.
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The insect that caused this rose shrub to produce this swelling or gall is very small: a cynipid wasp smaller than many ants. The wasp and its larvae produced plant growth hormone mimics that upset the normal cell processes and the rose responded by building the wasp a room with board. There are several species of gall wasps in the genus Diplolepis, the exact species would require collection and then dissection by a specialist.
Cynipidae -- Gall Wasp Family
Host Plant - Rosa woodsii:
