. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. C. Januai7,1926 THE STRAWBERRY ROOTWORM, A NEW PEST ON GREENHOUSE ROSES ^ By C. A. Weigel, Associate Entomologist, Fruit Insect Investigations, Bureau of Entomology CONTENTS Page Systematic history 2 Economic liistory and food plants 3 Recent injury in greenhouses 4 Distribution 6 Nature of injury and economic im- portance 6 Life history and habits 8 Page Seasonal history 25 Natural enemies 27 Experiments in control 27 Preventive measures 44 Summary 45 Recommendations for control 46 Literature cited 47 D
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Washington, D. C. Januai7,1926 THE STRAWBERRY ROOTWORM, A NEW PEST ON GREENHOUSE ROSES ^ By C. A. Weigel, Associate Entomologist, Fruit Insect Investigations, Bureau of Entomology CONTENTS Page Systematic history 2 Economic liistory and food plants 3 Recent injury in greenhouses 4 Distribution 6 Nature of injury and economic im- portance 6 Life history and habits 8 Page Seasonal history 25 Natural enemies 27 Experiments in control 27 Preventive measures 44 Summary 45 Recommendations for control 46 Literature cited 47 During the last 40 years the native insect known as the straw- berry rootworm, or strawberry leaf beetle, Paria canella (Fab.), varieties quadrinotata (Say) and gilvipes (Crotch), was considered a serious enemy of strawberry, raspberry, and a few other plants only. Suddenly this little beetle appeared in greenhouses, attack- ing roses in Virginia, Indiana, New Jersey, Pennsylvania, and Mary- land. Prior to 1916 a suggestion that this insect would abandon its usual hosts {29, p. 67Y for the succulent rose might have been sub- ject to considerable doubt; but when simultaneous reports were re- ceived by the Bureau of Entomology concerning two widely sepa- rated infestations of an insect injuring roses in greenhouses at Alex- andria, Va., and Richmond, Ind., such doubts would have been dis- pelled, because an examination of the specimens which accompanied ' The account of the strawberry rootworm and its control contained in this bulletin is the result of an investigation started In .Tuly, 1919, when the first reports were received by the Bureau of Entomology concerning injury by this insect to greenhouse roses. B. L. Chambers assisted in the work until August," lf520, and C. F. Doucette from .Tanuary, 1921, until It was completed. Through thf courtesy of T. G. Sanders, then director of the bureau of plant industry, Pennsylvania Department of Agriculture, a large portion of the
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