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61 > Image 61 of Annual report. 1921

Part of Kentucky Agricultural Experiment Station

BULLETIN NO. 231 g THE RELATION OF THE KENTUCKY SPECIES OF SOLIDAGO TO THE PERIOD OF ACTIVITY - r `J ` OF ADULT CYLLENE ROBINIAE V By H. GARMAN I .9 The close association of some insects with plants upon . which they feed has been a subject of remark for many years, a but as far as I know attention has not before been given to this ' _ i species and its relation to the plants upon which the adult . beetle feeds and upon which it seems to be dependent. In a bul- ;S letin on the life-history and ecology of the locust borer pub- . lished in 1916** a particularly close relation was recorded be- i I tween the adult insect and the tall goldenrod (Solidago allis- sinzu) growing on open ground in Kentucky, and the present I St e publication is in the main a continuation of observations on this 3 food plant, together with others made on related species of I I the genus and on a few other genera of Compositae. The life period of the adult borer as determined by collec- tion and observations made from December ].-I, 1885), up to the present time, extends from September 2 to October 31, the length Y " of the period elapsing after the beetles begin to emerge depend- _ ing on the earliness of killing frosts. When these come, the ' goldenrod iiowers are destroyed and tl1e beetles at once disap- pear. If frosts come near the first of October the period for the beetles may be shortened a month. Beetles are always . found soon after the first of September, when they begin to appear, and as long thereafter as uninjured goldenrod remains . *Unlleli112O