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Image 63 of Annual report. 1921

Part of Kentucky Agricultural Experiment Station

Species of Sobidago in Relation to Cyllene Robin/iae 5 A ‘ l seen. S. jtmcea blooms before the beetles emerge. S. adam, is local 1 fi and not very common, as are also S. shortii and S. olwlmtesis, S. 1 ulmifolia is more or less completely a species of woodland, as G A are also S. rupestrris and S. serotina. Beetles have been observed upon flowers of the remaining goldenrods: S. rugosa, S. otemer- K olds, S. canwdemis and S. alféssimo, but only on the last named E . in large numbers. S. rugosa and S. nemoralis frequent sandy g ~ soils, and are thus common only locally in Kentucky. But c ? few beetles have been taken from them at any time. When the _ first beetles appear during the first ten days of September . ;O S. ecmadensis furnishes some of the forage, but this goldenrod 37 ` is past its prime by the middle of the month and S. alfissima _; - is at its best from about the tenth until the last of October, _ when the beetles disappear. The tall goldenrod has even been V.V. collected in bloom in November, beyond the period when the A locust borer has been seen. · f Plants of the genera Euthamia and Brachychaeta have not _ Y been observed to attract the beetles, but are so closely related to Solidago that they may be considered as possible food plants, » - to be further observed. The only species of Eupatorium upon ` T which beetles have been collected are E. ser0ti~mt.m, very com- mon in August and September in Western Kentucky, and E. ` V perfoliatum. The number of instances of the occurrence of 1 beetles on the flowers of these plants has, however, proved so ‘ small as not to alter the force of statements made in Bulletin , No. 200 of the Kentucky Station as to the dependence of the ' g beetles on S. altissima. er ‘ The beetle is certainly adapted to the genus Solidago, not t )- K alone in the matter of food and its period of adult activity, .11 but in its colors as well. For while at first thought the oddly 31 °i cross-striped insect seems conspicuously marked yet the beetles ,.7 are not conspicuous when resting on the flowers of Solidago. I is . have sometimes wondered why they were not of a uniform , yellow color, seeing that they frequent a yellow flower. The V; yéllow cross lines are, it is true, of the exact shade of yellow IG of the flowers, but another feature of the coloration imp1‘GSS€S m * B16 as of more importance than this correspondence of color by