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University of Arizona (1978)

Root-boring insects in Gutierrezia sarothrae

Falkenhagen, Thomas Jay

Titre : Root-boring insects in Gutierrezia sarothrae

Auteur : Falkenhagen, Thomas Jay

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1978

The purpose of this study was to investigate the biology of root-boring insects in Gutierrezia sarothrae, a range weed. This included identifying major insects infesting the roots, documenting the approximate damage caused by each type of insect, and determining each insect’s approximate life history and field density. Results reflect general trends for a specific area for a limited period of time and should hot be used in other areas without more extensive research. Plants in the field were sampled by a line transect method. Larvae were removed from the roots and reared to adults on artificial lima bean media in the laboratory. Field and laboratory data reflected emergence patterns. Four borer species were reared and identified. These included Myrmex lineolata (Pascoe) (sOtidocephaius) (Curculionidae), Hippomelas carolinensjs (Horn) (Buptestidae), Chrysobothris arizonica (Chamberlain) (Buprestidae), and Agrilus gibbicollis (Fall) (Buprestidae). Possible predators and other root inhabitants included Enoclerus laetus nexus (Barr) (Cleridae), Rhadalus testaceus (Le Conte) (Melyridae), Mordella species (Mordellidae), and Certainiops abdominalis (Brown) (Asilidae). Borers may reduce the ability of G. sarothrae plants to compete with desirable forage plants by damaging supporting tissues in the roots and lowering plant vigor. The potential for using these root-borers for controlling (3. sarothrae plants could not be assessed by the present study ; however, further research is warranted.

Mots clés : Gutierrezia. ; Roots (Botany) — Diseases and pests. ; Insects — Arizona.


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