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Morphology of the balsam of needle gall induced by the midge Paradiplosis tumifex (Diptera: Cecidomyidae)

, : Morphology of the balsam of needle gall induced by the midge Paradiplosis tumifex (Diptera: Cecidomyidae). Canadian Journal of Botany, 602: 131-140

P. tumifex induces a simple, single-chambered, prosoplasmic gall on the adaxial surface of current-year needles of balsam fir. Proliferating and enlarged mesophyll cells surround the immature larva except for an ostiolar opening on the adaxial surface. The vascular bundle is not affected by gall formation, but the cells lining the resin ducts are altered. As the gall matures the epidermis and 1 or 2 layers of underlying mesophyll cells become lignified. Concentrations of starch granules are retained in gall cells after starch has been dissipated in tissues beyond the gall and in nongalled needles. Host damage occurs when galled needle dry and abscise prematurely.


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