Navigation Links
Hemlocks still abundant despite adelgid infestations
Date:9/26/2011

emlock woolly adelgid.

A tiny insect introduced into the United States from East Asia, the hemlock woolly adelgid feeds at the base of hemlock needles, defoliating and eventually killing trees. Since the insect was first noticed in the 1950s, it has expanded its range at between 4.7 and 12.7 miles a year and currently infests about 45 percent of the range of hemlocks in the United States and 41 percent of all hemlock trees.

"The analysis also showed that the general regional trend in the East over the past 50 years has been one of increasing hemlock volume, even with infestation by the hemlock woolly adelgid," says Randall Morin, NRS FIA research forester and primary author of the update. "Even though the insect has caused substantial negative impacts on hemlock at local scales, analysis of FIA data suggests that infestations have not yet reduced the overall abundance of hemlock, even in states where hemlock woolly adelgid has been active for decades."

The authors caution that the trend of increasing hemlock volume may not last much longer.

"Despite increasing hemlock volume over the last four decades across most of the eastern United States, the regions with long-established populations of hemlock woolly adelgid are also the regions where hemlock is accumulating slowest," says Morin. "Net growth rates decrease as years of infestation increase and mortality rates increase, with mortality starting to equal net growth in areas where hemlock woolly adelgid has been present for 10 to 20 years." As time goes on, the trend of increasing abundance may begin to reverse.


'/>"/>

Contact: Sonja Oswalt
soswalt@fs.fed.us
865-862-2058
USDA Forest Service ‑ Southern Research Station
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Nordic study shows marginally higher but overall low risk of stillbirth in ART children
2. GOES satellites see ash still spewing from Chilean volcano
3. Study reveals how high-fat diet during pregnancy increases risk of stillbirth
4. Study: Pace of brain development still strong in late teens
5. Racial disparities still exist in colorectal cancer screening despite increased Medicare coverage
6. Americans still may not be getting enough calcium
7. Penguins that shun ice still lose big from a warming climate
8. EARTH: Still in a haze: Black carbon
9. Elevated nitrogen and phosphorus still widespread in much of the nations streams and groundwater
10. Research shows radiometric dating still reliable (again)
11. Survey shows many are still clueless on how to save energy
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Hemlocks still abundant despite adelgid infestations
(Date:4/17/2014)... in the Cell Press journal Current Biology ... rather novel sex lives. The Brazilian insects, which represent ... Neotrogla , are the first example of an animal ... been identified in several different animals, Neotrogla ... is also reversed," says Kazunori Yoshizawa from Hokkaido University ...
(Date:4/17/2014)... Medical Branch at Galveston are the first to ... cervical cancer should begin colorectal cancer screening earlier ... finding a high incidence of secondary colorectal cancers ... new recommendations that the younger women in this ... after their initial cervical cancer diagnosis instead of ...
(Date:4/17/2014)... researchers, led by the Australian National University (ANU), ... changes and deep-sea temperature variability over the past ... better understand the climate surrounding ice ages over ... determine the relationship between carbon dioxide levels, global ... the University of Southampton (UoS) and the National ...
Breaking Biology News(10 mins):In sex-reversed cave insects, females have the penises 2Radiation therapy for cervical cancer increases risk for colorectal cancer 2Ancient sea-levels give new clues on ice ages 2
... Western Europe,s largest lakes, Lake Geneva, in large enough quantities ... that these small bits of plastic can be harmful to ... waterborne organisms, the full extent of their consequences in lakes ... is being extending under a mandate by the Swiss Federal ...
... paper published in the Journal of Animal Science ... when including distillers dried grains with solubles (DDGS). Some ... the fat-softening effects of DDGS. Firmer fat means longer-lasting ... found that including saturated fats in DDGS diets makes ...
... to threaten common ash trees across Europe, new research in ... impact of forest diseases to discover if diseases played a ... large-scale pathogen outbreaks were much more infrequent in the past, ... locations, such as the international seed trade, is a major ...
Cached Biology News:Microplastic pollution prevalent in lakes too 2Microplastic pollution prevalent in lakes too 3Saturated fats do not yield better bacon 2
(Date:1/15/2014)... TaiGen Biotechnology Company, Limited ("TaiGen") today announced that ... leading Russian pharmaceutical company, to develop and commercialize nemonoxacin ... , Turkey and other ... novel antibiotic for the treatment of bacterial infections including ...
(Date:1/14/2014)... 2014 Histogen, Inc., a regenerative medicine ... grown under simulated embryonic conditions, today announced that they ... Medical, Inc. for physician-dispensed aesthetic products containing Histogen’s proprietary ... agreement is an amendment to the existing license between ...
(Date:1/14/2014)... 14, 2014 EquitiesIQ, a leading informational ... ALQA). Alliqua is an emerging biomedical company acquiring, developing, ... care market. , Free report download: http://equitiesiq.com/reports/alliqua/ ... seasoned management team and Board, which launched the company’s ...
(Date:1/14/2014)... iLab Solutions, the leader in core facility management software, ... Strategy. In this role, Michelle will work with current and ... the development of iLab products. Her main goal will be ... the scientific community by offering the most advanced, user-friendly, and ...
Breaking Biology Technology:TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 2TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 3TaiGen Biotechnology Signed Exclusive License Agreement with R-Pharm for Nemonoxacin (Taigexyn(R)) 4Histogen and Suneva Medical Expand License for Cell Conditioned Media-based Aesthetic Products Internationally 2Histogen and Suneva Medical Expand License for Cell Conditioned Media-based Aesthetic Products Internationally 3EquitiesIQ Initiates Coverage of Alliqua, Inc. 2EquitiesIQ Initiates Coverage of Alliqua, Inc. 3iLab Solutions Announces Michelle Detwiler as the New Director of Product Strategy 2
... Onyx,Pharmaceuticals, Inc. (Nasdaq: ONXX ) today announced ... executive officer and a member of,the company,s board of ... Renton, who announced his retirement plans last,October. Mr. Renton ... of the Onyx Board of Directors on the same ...
... 2008 9:15 am ET, MOUNTAINSIDE, N.J., Feb. ... NHGI) today announced that its President,Michael Cohen will ... Government Agencies, Academic Institutions and Development Stage,Biotech Companies," ... Partnering,Series: Fostering Business Collaborations & Careers in Stem ...
... Senetek PLC (OTC,Bulletin Board: SNKTY), a Life Sciences company ... of healthy aging, today announced,that results of a clinical ... of the Journal of Drugs in Dermatology., The ... of,topical Pyratine-6(TM) over 12 weeks for improving the baseline ...
Cached Biology Technology:Onyx Pharmaceuticals Names N. Anthony Coles, M.D. as President, Chief Executive Officer and Member of its Board of Directors 2Onyx Pharmaceuticals Names N. Anthony Coles, M.D. as President, Chief Executive Officer and Member of its Board of Directors 3National Stem Cell Holding, Inc. to Present Keynote Address at The Stem Cell Partnering Series Inaugural Meeting in San Diego 2National Stem Cell Holding, Inc. to Present Keynote Address at The Stem Cell Partnering Series Inaugural Meeting in San Diego 3Pyratine-6(TM) Study Published in Journal of Drugs in Dermatology 2Pyratine-6(TM) Study Published in Journal of Drugs in Dermatology 3