Suppression Tactics for Dendroctonus frontalis Zimmerman (Coleoptera: Scolytidae): An Examination of the Occurrence of Infestations Adjacent to Treatment Sites
| Autor: | Robert N. Coulson, Forrest L. Oliveria, Jeffrey W. Fitzgerald, Paul E. Pulley, Kenneth M. Swain, Richard O. Flamm, David B. Drummond |
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| Rok vydání: | 1994 |
| Předmět: |
integumentary system
Ecology biology business.industry Pest control Zoology General Medicine biology.organism_classification medicine.disease_cause Population density Cultural control Insect Science parasitic diseases Infestation medicine Biological dispersal PEST analysis business Dendroctonus frontalis Woody plant |
| Zdroj: | Journal of Economic Entomology. 87:417-425 |
| ISSN: | 1938-291X 0022-0493 |
| Popis: | Proliferation is the vernacular expression commonly used to describe the process of establishment of a new southern pine beetle ( Dendroctonus frontalis Zimmermann) infestation in the vicinity of an existing one. We examined the proliferation process in relation to infestations treated with two commonly used suppression tactics: cut-and-leave and cut-and-remove. Because the modes of action for these tactics have not been examined, this circumstance led to our speculation that beetles dispersing from treatment sites, especially cut-and-leave tactics, initiated new infestations (i.e., caused proliferation). In this study we (1) compared the incidence of proliferation among infestations treated by cut-and-remove and cut-and-leave tactics, (2) examined the incidence of proliferation relative to an expected value for each treatment type, and (3) evaluated the incidence of proliferation as a function of infestation size and number of adjacent infestations. Two databases containing information on locations of treated and non treated infestations occurring in East Texas were used. Using comparative statistical tests, we found no significant difference in proliferation between cut-and-leave and cut-and-remove tactics. For the range of the database, infestation size did not influence proliferation, but the number of infestations surrounding the source affected proliferation. These results do not support the contention that southern pine beetles emigrating from treatment sites result in establishment of a larger number of infestations than expected. |
| Databáze: | OpenAIRE |
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