Ability of the Redbay Ambrosia Beetle (Coleoptera: Curculionidae: Scolytinae) to Bore Into Young Avocado (Lauraceae) Plants and Transmit the Laurel Wilt Pathogen (Raffaelea Sp.) (Report)
Florida Entomologist 2008, Sept, 91, 3
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Laurel wilt is a vascular disease of plants in the Laurel family (Lauraceae) that has caused extensive mortality of redbay (Persea borbonia (L.) Spreng) trees in South Carolina, Georgia, and Florida. The disease is caused by a previously undescribed species of Raffaelea, a fungal symbiont of the non-native redbay ambrosia beetle, Xyleborus glabratus Eichhoff (Fraedrich et al. 2008). Xyleborus glabratus was initially detected in the U.S. near Savannah, GA in 2002 (Rabaglia et al. 2006). The beetle carries spores of the laurel wilt fungus in mandibular mycangia and inoculates the xylem of host trees by boring into the wood. In redbay, the fungus moves rapidly through the xylem, plugging the flow of water and causing trees to die in a matter of weeks or a few months. Affected trees are characterized by a dark discoloration in the outer sapwood (Fraedrich et al. 2008). Laurel wilt continues to devastate populations of redbay in the southeastern coastal plain and the distribution of the disease has rapidly expanded (Johnson et al. 2008). In the summer and fall of 2006, 16 small avocado (Persea americana var. americana Mill.) trees were planted on Ft. George Island, FL, a site with a high incidence of laurel wilt. By 12 Feb 2007, X. glabratus and its associated Raffaelea sp. were obtained from two dying trees of the West Indian cultivar Donnie (A.E.M., J.E.P. & J.H.C., unpublished data). In September 2007, a large avocado tree in a homeowner's yard in Jacksonville, FL also was discovered to be diseased with laurel wilt (Mayfield et al. 2008). In growth chamber experiments, some avocado plants wilted after artificial inoculation with the laurel wilt pathogen (Fraedrich et al. 2008). Furthermore, avocado wood has been demonstrated to be attractive to X. glabratus in field trapping trials (Hanula et al. in press). Concern exists that laurel wilt and X. glabratus could negatively impact the commercial avocado industry in south Florida and beyond.
- 2,99 €
- Category: Life Sciences
- Published: 01 September 2008
- Publisher: Florida Entomological Society
- Print Length: 8 Pages
- Language: English