虫こぶ : WILLOW TUBE GALL MIDGE (lteomyia sp. B)

 WILLOW TUBE GALL MIDGE

lteomyia sp. B

• 2月23日。wrからtc方面に抜けるハイキング・トレイルにて。
• Yellow Willow (Salix lasiandra = Salix lucida ssp. lasiandra)。
• 目の高さ。
• ミツバチの羽音で見つけた木。人家の裏。

参考url

http://en.wikipedia.org/wiki/Salix_lucida

http://plants.usda.gov/plantguide/pdf/cs_salul.pdf

要和訳：dc氏より転送：This midge induces round-tubular monothalamous galls that hang from the bottom of arroyo willow (Salix lasiolepis) leaves.  The distinguishing character of these midge galls is the apical hole or depression that develops at the end of each gall.  While most of the gall hangs below the leaf, there is usually a slight depression on the dorsal surface.  Galls are commonly pink to rose red with hints of yellow and green.  Galls may develop singly or in coalescing groups of four to five individuals. These midge galls measure 5 mm high by 4 mm wide at their base.  Gall development begins in spring in the central coast area of California.  This species may occur outside of California and throughout the range of the arroyo Willow group.  While the biology of this species is relatively unknown, larvae appear to leave the gall by autumn.  Presumably,they pupate in spring.  Willows that retain their leaves into fall and winter may continue to support the galls of this species.