Wheat Stem Sawfly Parasites, Collyria calcitrator and Pediobius nigritarsis, in Eastern United States
| Autor: | Leon W. Coles, Frederick A. Streams |
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| Rok vydání: | 1965 |
| Předmět: | |
| Zdroj: | Journal of Economic Entomology. 58:303-306 |
| ISSN: | 1938-291X 0022-0493 |
| Popis: | From 1935–38 Collyria calcitrator (Gravenhorst), a parasite of the European wheat stem sawfly, Cephus pygmaeus (L.), was released in Eastern United States by the USDA but not recovered until 1957, when adults of Collyria calcitrator were collected near Moorestown, N. J. and southeastern Pennsylvania. In 1962–63 a survey of wheat fields in Northeastern States showed that C. calcitrator was distributed throughout the range of Cephus pygmaeus and parasitized a high percentage of the larvae of this species but apparently did not attack the closely related black grain stem sawfly, Cephus tabidus (F.), as recorded in Europe. About 5% of the C. pygmaeus and 18% of the C. tabidus were parasitized by Pediobius nigritarsis (Thomson). Multiple parasitism of C. pygmaeus larvae by Collyria calcitrator and P. nigritarsis was observed. P. nigritarsis may be superior and supersede C. calcitrator when both attack the same host. Cephus pygmaeus has declined as a pest since Collyria calcitrator was introduced, but this decline may be only coincidental, since Cephus tabidus also has decreased in importance. |
| Databáze: | OpenAIRE |
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