Navigation Links
Beetle-fungus disease threatens crops and landscape trees in Southern California
Date:5/8/2012

RIVERSIDE, Calif. A plant pathologist at the University of California, Riverside has identified a fungus that has been linked to the branch dieback and general decline of several backyard avocado and landscape trees in residential neighborhoods of Los Angeles County.

The fungus is a new species of Fusarium. Scientists are working on characterizing its specific identification. It is transmitted by the Tea Shot Hole Borer (Euwallacea fornicatus), an exotic ambrosia beetle that is smaller than a sesame seed. The disease it spreads is referred to as "Fusarium dieback."

"This beetle has also been found in Israel and since 2009, the beetle-fungus combination has caused severe damage to avocado trees there," said Akif Eskalen, an extension plant pathologist UC Riverside, whose lab identified the fungus.

To date, the Tea Shot Hole Borer has been reported on 18 different plant species worldwide, including avocado, tea, citrus, guava, lychee, mango, persimmon, pomegranate, macadamia and silk oak.

Eskalen explained that the beetle and fungus have a symbiotic relationship.

"When the beetle burrows into the tree, it inoculates the host plant with the fungus it carries in its mouth parts," he said. "The fungus then attacks the vascular tissue of the tree, disturbing water and nutrient flow, and eventually causing branch dieback. The beetle larvae live in galleries within the tree and feed on the fungus."

Although the beetle was first detected in Los Angeles County in 2003, reports of its negative impact on tree health were paid no attention until February 2012, when Eskalen found both the beetle and fungus on a backyard avocado tree showing dieback symptoms in South Gate, Los Angeles County. The Agricultural Commissioner of Los Angeles County and the California Food and Drug Administration have confirmed the identity of the beetle.

"This is the very same fungus that caused avocado dieback in Israel," Eskalen said. "The California Avocado Commission is concerned about the economic damage this fungus can do to the industry here in California.

"For now, we are asking gardeners to keep an eye on their trees and report to us any sign of the fungus or beetle," he added. "Symptoms in avocado include the appearance of white powdery exudate in association with a single beetle exit hole on the bark of the trunk and main branches of the tree. This exudate could be dry or it can appear as a wet discoloration."

A team of UCR scientists has been formed to study Fusarium dieback in Southern California. Eskalen and Alex Gonzalez, a field specialist, are already conducting a survey to determine the extent of the beetle infestation and the likely extent of the fungus infection in avocado trees and other host plants. Richard Stouthamer, a professor of entomology, and Paul Rugman-Jones, an associate specialist in entomology, are studying the biology and genetics of the beetle.


'/>"/>

Contact: Iqbal Pittalwala
iqbal@ucr.edu
951-827-6050
University of California - Riverside
Source:Eurekalert  

Related biology news :

1. Some HDL, or good cholesterol, may not protect against heart disease
2. Sloppy shipping of human retina leads IU researchers to discover new treatment path for eye disease
3. Breast cancer in young women: A distinct disease
4. Geneticist develops tool to identify genes important in disease, tailoring individual treatment
5. When cells hit the wall: UCLA engineers put the squeeze on cells to diagnose disease
6. Scientists uncover exciting lead into premature aging and heart disease
7. New avocado rootstocks are high-performing and disease-tolerant
8. Striatal brain volume predicts Huntington disease onset
9. Invisible helpers: How probiotic bacteria protect against inflammatory bowel diseases
10. Scientists uncover strong support for once-marginalized theory on Parkinsons disease
11. Family history of liver cancer increases risk of developing the disease
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Beetle-fungus disease threatens crops and landscape trees in Southern California
(Date:3/30/2017)... , March 30, 2017 The research team ... for three-dimensional (3D) fingerprint identification by adopting ground breaking 3D fingerprint ... new realm of speed and accuracy for use in identification, crime ... affordable cost. ... A ...
(Date:3/27/2017)... , March 27, 2017  Catholic Health Services ... Management Systems Society (HIMSS) Analytics for achieving Stage ... Model sm . In addition, CHS previously earned ... hospitals using an electronic medical record (EMR). ... high level of EMR usage in an outpatient ...
(Date:3/23/2017)... Mar. 23, 2017 Research and Markets has ... Analysis & Trends - Industry Forecast to 2025" report to ... ... a CAGR of around 8.8% over the next decade to reach ... analyzes the market estimates and forecasts for all the given segments ...
Breaking Biology News(10 mins):
(Date:5/23/2017)... Philadelphia, PA. (PRWEB) , ... May 23, 2017 ... ... Clinical Works as Vice President of Clinical Operations. She brings years ... Pharmaceuticals, and Yaupon Therapeutics. From her professional foundation as a licensed occupational therapist, ...
(Date:5/22/2017)... Boston, MA (PRWEB) , ... May 22, 2017 , ... ... evidence, has expanded to the East Coast. It has opened an office in downtown ... innovative therapies are finding it increasingly more important to generate evidence on the value ...
(Date:5/21/2017)... ... May 20, 2017 , ... CNSDose is ... trial and error process by finding the right antidepressant faster. CNSDose speeds ... doctor-patient relationship through a personalized approach to treatment. , A peer-reviewed ...
(Date:5/18/2017)... , ... May 18, 2017 , ... ... The Tapas Cooking Challenge is a two-hour team-building package designed for groups ... created by Chef Jodi Abel, which include items, such as Blackened Shrimp with ...
Breaking Biology Technology: