. Bulletin of the Department of Agriculture. Agriculture. No. 90 Contribution from the Bureau of Entomology, L. O. Howard, Chief May 19, THE ROSE APHIS.' By H. M. Russell, Entomological Assistant, Truck Crop and Stored Product Insect Invesligations. INTRODUCTION. Because of its beauty, and its hardiness as an outdoor })lant, the rose has long been one of the most ])Opular ornamental flowers in this country. Yet in spite of the appreciation given it the blossoms and young foliage are frequently pei-mitted to suffer great damage from the rose aphis {Macrosiphum rosx L.), whereas a fe
. Bulletin of the Department of Agriculture. Agriculture. No. 90 Contribution from the Bureau of Entomology, L. O. Howard, Chief May 19, THE ROSE APHIS.' By H. M. Russell, Entomological Assistant, Truck Crop and Stored Product Insect Invesligations. INTRODUCTION. Because of its beauty, and its hardiness as an outdoor })lant, the rose has long been one of the most ])Opular ornamental flowers in this country. Yet in spite of the appreciation given it the blossoms and young foliage are frequently pei-mitted to suffer great damage from the rose aphis {Macrosiphum rosx L.), whereas a few minutes' atten- tion on the part of the owner each week would remedy the injury and greatly increase the beauty of the bloom and foHage. This com- mon rose pest was fii'st described by Linnaeus ^ in 1735, and since that time has often been mentioned in systematic works by both European and American ^vriters. However, the wiiter has seen no account of it in American entomological publications in which the hfe history, habits, or control have been treated with anything approaching completeness. The writer, therefore, in 1910, while sta- tioned at Los Angeles and under the direction of Dr. F. H. Chitten- den, began a study of the hfe history and habits of the rose aphis in its occurrence on the outdoor roses so largely growm in southern Cahfornia. At a later period the work was carried on to some extent in Washington, D. C. While this study is stiU incomplete, enough has been learned to give the rose lover a fair understanding of the habits of this insect and of the means for controlhng it. RECENT RECORDS. During the fall and mnter of 1909 and the spring of 1910 the writer found the rose aphis attacking roses and causing extensive damage to the buds and blossoms throughout the city and in the vicinity of Los Angeles. On October 21, 1909, when firet observed. ' This bulletin is of interest to rose growers everywhere. 2 Linnaeus, C., Systema Natur., ed. 12, vol. 1, pt. 2, p. 734,1
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