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Goldspotted Oak Borer T.W Forest Insect & Disease Leaflet 183 March 2015 U.S. Department of Agriculture • Forest Service Goldspotted Oak Borer T.W. Coleman1, M.I. Jones2, S.L. Smith3, R.C. Venette4, M.L. Flint5, and S.J. Seybold 6 The goldspotted oak borer (GSOB), New Mexico, and southwestern Texas. Agrilus auroguttatus Schaeffer Specimens of GSOB have only been (Coleoptera: Buprestidae) (Figure collected from Arizona, California, 1), is a flatheaded phloem- and wood and Mexico. In southeastern Arizona, borer that infests and kills several GSOB feeds primarily on Q. emoryi, species of oak (Fagaceae: Quercus) in and silverleaf oak, Q. hypoleucoides A. California. One or more populations Camus (both Section Lobatae). Larval of GSOB were likely introduced via feeding injures the phloem and outer infested firewood into San Diego xylem of these red oak species, with County, California from the native most feeding activity and occasional range in southeastern Arizona. Since cases of tree mortality noted in large- its introduction to California, GSOB has expanded its range and has killed red oaks (Quercus Section Lobatae) nearly continuously across public and private lands (Figure 2). Distribution and Hosts The native distribution of GSOB likely coincides with that of Emory oak, Q. emoryi Torrey, including the Coronado Figure 1. Adult goldspotted oak borer, Agrilus National Forest in southeastern auroguttatus, an exotic insect threatening red Arizona and floristically related oaks in California (Adults are approximately regions in northern Mexico, southern 0.35 inches long by 0.08 inches wide). 1Entomologist, USDA Forest Service, Forest Health Protection, San Bernardino, CA; 2Entomologist, Dept. of Environmental Science and Forestry, Syracuse University, Syracuse, NY; 3Entomologist, USDA Forest Service, Forest Health Protection, Susanville, CA; 4Research Biologist, USDA Forest Service, Northern Research Station, St. Paul, MN; 5Entomologist, Dept. of Entomology and Nematology and Statewide Integrated Pest Management Program, University of California, Davis, CA; 6Research Entomologist, USDA Forest Service, Pacific Southwest Research Station, Davis, CA. Figure 2. Aerially mapped oak mortality (red stippling) associated with the goldspotted oak borer in San Diego County in southern California (2002-2013). Disjunct infested areas (satellite populations indicated by ●) occur in San Diego County (San Diego); Riverside County (Idyllwild) and Orange County (Orange). diameter trees [>17 inches in diameter facilitated the dispersal of GSOB in at breast height (dbh)]. A sibling southern California and will likely species, the Mexican goldspotted oak continue to play a role in its future borer, A. coxalis Waterhouse, is native dispersal in California and beyond. to central and southern Mexico and Guatemala, and was once synonymized In California, GSOB preferentially with A. auroguttatus. Surveys have attacks and kills large-diameter coast shown that Mexican GSOB feeds on live oaks, Q. agrifolia Née, and both red oaks and white oaks (Section California black oaks, Q. kelloggii Quercus) in southern Mexico. Newberry (>18 and 20 inches dbh, respectively). Interior live oak, Q. In 2004, GSOB was first detected in wislizeni A. DC., another red oak survey traps in southern California (San species, was susceptible to GSOB larval Diego Co.), but it was not linked to tree feeding in laboratory tests, but GSOB injury or mortality until 2008. In 2012, has not been observed to infest this oak GSOB was detected in Riverside Co. species in the field. Goldspotted oak and was likely introduced to this new borer can also attack a taxonomically county in infested firewood (Figure 2). intermediate oak species, canyon live The movement of infested firewood oak, Q. chrysolepis Liebm. (Section was also most likely responsible Protobalanus), and, on rare occasions, for additional satellite infestations a white oak species, Engelmann oak, of GSOB that have been detected Q. engelmannii Greene, in California. elsewhere within San Diego Co., and Goldspotted oak borer has killed in Orange Co. Unregulated movement canyon live oak at low levels (<25% of infested oak wood has presumably of surveyed trees) in San Diego Co. 2 Dead Engelmann oak trees have been then to northern California along observed with signs of GSOB injury the Coastal Mountain Range (Figure (e.g., larval galleries and D-shaped 3). It also extends south into Baja emergence holes, see below), but tree California Norte, Mexico. California mortality in these cases was likely a black oak occurs on Mt. Laguna and result of a complex of factors (e.g., Palomar Mountain in San Diego Co., drought and root disease). Several the Transverse Mountain Range, ornamental oak species, including Coastal Mountain Range, and along holly oak, Q. ilex (Section Quercus), the Sierra Nevada Mountain Range and cork oak, Q. suber (Section to southern Oregon. Goldspotted oak Cerris), are planted frequently in the borer-caused mortality has occurred urban areas of southern California and in coast live oak at sea level as well as may be at risk. In laboratory studies, in California black oak at elevations GSOB larvae fed on cork oak logs but up to approximately 6,000 feet in were unable to complete development. San Diego Co.; in laboratory tests, However, it has been hypothesized that prepupae (mature larvae in a hair-pin species in the Sections Quercus and configuration) have shown a cold- Cerris are not favored by GSOB and tolerance of approximately -0.4° F likely not susceptible to the extensive during the winter months. The beetle’s injury needed to cause tree mortality. distribution will likely expand from San Diego, Riverside, and Orange Cos. In California, the range of coast live to mirror the range of its primary hosts oak extends north from San Diego and conducive climatic conditions in Co. along the Santa Anita Mountains California and into Oregon and Mexico and Transverse Mountain Range and (Figure 3). Figure 3. Potential range of goldspotted oak borer in Arizona, California, New Mexico, Oregon, and Baja California Norte, Mexico based on host distributions and climatic suitability. On the map, areas with hosts are colored, and climatically suitable areas within the distribution of hosts appear as shades of yellow (moderately suitable), orange, and red (highly suitable). 3 Impacts the main stem is girdled and the oaks sustain significant injury and, eventually, mortality (Figure 4B). This Neither GSOB nor Mexican GSOB is process appears to be gradual, taking considered a significant pest or threat from 3 to 5 years. However, oaks to forest health in its native range. predisposed by other injury agents Instead, they have caused minor levels (e.g., drought and root disease) may of injury to oaks (4% infestation succumb more quickly to the effects of rates) and have been associated with GSOB larval feeding. background levels of tree mortality in Arizona (2%) and Mexico (1%). As In coast live oak woodlands in eastern a consequence, virtually no research San Diego Co. where trees have related to the biology and ecology of suffered at least a decade of infestation these species occurred prior to 2008 from GSOB, oak mortality levels have when GSOB-caused oak mortality was approached 45%. Infestation rates have discovered in California. been high (>90%) on large-diameter oaks at the hypothetical origin of the The death of large-diameter coast beetle’s introduction near Descanso live oaks and California black oaks in and Guatay in San Diego Co., but the California results from several years of rates are lower (<10%) at the edges of extensive larval feeding at the interface the advancing infestation. of the phloem and xylem (Figure 4). This feeding kills large sections of The expansion of the core area infested live tissue (Figure 4A), including the by GSOB has progressed slowly in vascular cambium. As a consequence, San Diego Co. despite a maximum adult flight distance of approximately A 0.9 miles in tethered flight mill assays in the laboratory. Moderately and severely infested trees (known as brood trees) represent <7% of the oaks in forest stands in areas that have B Figure 4. Typical goldspotted oak borer larval feeding galleries under recently removed bark of a living coast live oak tree (A) and etched on the xylem (wood) surface of a dead coast live oak tree (B). The meandering dark-colored galleries in living phloem and xylem (A) are characteristic of goldspotted oak borer larval feeding. 4 been infested for longer than a decade. longevity has not been recorded in the Coast live oak brood trees were field and is likely shorter in duration. also found at low densities in newly Adults feed on oak foliage to survive, infested sites and, based on inferred and females require approximately 10 population density from emergence days of feeding to become sexually hole records, they contain 66 to 93% mature and likely mate in the crown or of the GSOB population at these on the bark surface of the main stem sites. The contrast between the rate of or larger branches. In the laboratory, spread of the core population and the a single female can lay approximately appearance of satellite populations in 200-500 eggs. Females lay eggs in Orange, Riverside, and San Diego Cos. fissures and crevices on the bark surface suggests that GSOB will spread slowly of the main stem and larger branches, via natural dispersal or quickly via either singly or in clusters (Figure 5). human-assisted dispersal (Figure 2). The eggs are oval, approximately 0.01 inches wide, tan-colored, and very Life History difficult to find on the bark surface. The goldspotted oak borer typically Eggs develop in approximately 12 days completes one generation in a year. and first instar larvae bore through the However, anecdotal evidence suggests bark into the phloem. that populations may require more than one year to complete development in healthier hosts. In southern California, adults fly from mid-May to early October with peak flight occurring in late-June to early July (Table 1A).
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