Featured Research

from universities, journals, and other organizations

New Southern California Beetle Killing Oaks

Date:
May 2, 2009
Source:
US Forest Service, Pacific Southwest Research Station
Summary:
US Forest Service scientists have completed a study on a beetle that was first detected in California in 2004, but has now attacked 67 percent of the oak trees in an area 30 miles east of San Diego.

U.S. Forest Service scientists have completed a study on a beetle that was first detected in California in 2004, but has now attacked 67 percent of the oak trees in an area 30 miles east of San Diego.

Their report appears in the current issue of The Pan-Pacific Entomologist and focuses on Agrilus coxalis, a wood-boring beetle so rare it does not even have an accepted common name. Scientists have proposed the Entomological Society of America common names committee call it the goldspotted oak borer.

Land managers and scientists are concerned about further spread of the infestation because oaks are the dominant tree species in the area. Further tree mortality will increase fire danger and decrease wildlife habitat in southern California.

They are also concerned drought and climate change will make more oaks susceptible to an insect that is not native to California. Oak trees have a nearly continuous distribution in the state, reaching from the infestation area north to the Oregon border.

"We don't know how the beetle arrived in San Diego County because there's a broad barrier of desert around the localities where it was previously collected in Arizona, Guatemala, and Mexico," said Steve Seybold, an entomologist with the Forest Service's Pacific Southwest Research Station and one of the study's authors. "We suspect it was either recently brought to California or somehow expanded its range."

There are reports of oak firewood from Mexico frequently being brought into the area in the past 20 years and that could be how it was introduced, Seybold said.

The first California specimen was collected in 2004 in Cuyamaca Rancho State Park in San Diego County. But, aerial surveys of dying trees in the area suggest it might have arrived before 2002.

Last summer, Seybold and Forest Service Entomologist Tom Coleman assessed oak tree mortality in the Cleveland National Forest near Barrett Lake, Mount Laguna, and the community of Descanso.

It was there they found evidence of beetle attacks in 67 percent of coast live oak, canyon live oak, and California black oak trees. They estimate the infestation has impacted 17,000 trees on the national forest's Descanso Ranger District.

According to the scientists, to prevent further spread more research is needed to determine the beetle's California distribution, seasonal active periods, host preferences, and natural enemies in its native Arizona and Mexico habitat. Further research will also demonstrate how it survives and spreads through oak firewood.


Story Source:

The above story is based on materials provided by US Forest Service, Pacific Southwest Research Station. Note: Materials may be edited for content and length.


Journal Reference:

  1. Coleman et al. Previously unrecorded damage to oak, Quercus spp., in southern California by the goldspotted oak borer, Agrilus coxalis. The Pan-Pacific Entomologist, 2008; 84 (4): 288 DOI: 10.3956/2008-18.1

Cite This Page:

US Forest Service, Pacific Southwest Research Station. "New Southern California Beetle Killing Oaks." ScienceDaily. ScienceDaily, 2 May 2009. <www.sciencedaily.com/releases/2009/05/090501154147.htm>.
US Forest Service, Pacific Southwest Research Station. (2009, May 2). New Southern California Beetle Killing Oaks. ScienceDaily. Retrieved September 1, 2014 from www.sciencedaily.com/releases/2009/05/090501154147.htm
US Forest Service, Pacific Southwest Research Station. "New Southern California Beetle Killing Oaks." ScienceDaily. www.sciencedaily.com/releases/2009/05/090501154147.htm (accessed September 1, 2014).

Share This




More Plants & Animals News

Monday, September 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

We've Got Mites Living In Our Faces And So Do You

We've Got Mites Living In Our Faces And So Do You

Newsy (Aug. 30, 2014) A new study suggests 100 percent of adult humans (those over 18 years of age) have Demodex mites living in their faces. Video provided by Newsy
Powered by NewsLook.com
Washington Wildlife Center Goes Nuts Over Baby Squirrels

Washington Wildlife Center Goes Nuts Over Baby Squirrels

Reuters - US Online Video (Aug. 30, 2014) An animal rescue in Washington state receives an influx of orphaned squirrels, keeping workers busy as they nurse them back to health. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Experimental Ebola Drug ZMapp Cures Lab Monkeys Of Disease

Experimental Ebola Drug ZMapp Cures Lab Monkeys Of Disease

Newsy (Aug. 29, 2014) In a new study, a promising experimental treatment for Ebola managed to cure a group of infected macaque monkeys. Video provided by Newsy
Powered by NewsLook.com
Killer Amoeba Found in Louisiana Water System

Killer Amoeba Found in Louisiana Water System

AP (Aug. 28, 2014) State health officials say testing has confirmed the presence of a killer amoeba in a water system serving three St. John the Baptist Parish towns. (Aug. 28) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins