Hemlock Woolly Adelgid
What is that white stuff on my Hemlocks? It could be Woolly Adelgid. This is a fairly easy pest to control on the landscape, though almost impossible to control in the forest. Horticultural Oil easily kills this pest if you can get 100% coverage. Merit (imidicloprid) injected into the soil will also control Hemlock Woolly Adelgid. Imidicloprid can take several weeks to reach the tops of trees depending on hight. Imidicloprid will also kill the predators of mites so should generally be used only if the Woolly Adelgid on your hemlocks can not be controlled by Oil due to tree size or accessibility.
Xavier
IPM OF New Hampshire
www.ipmofnh.com
Posted by IPM Man at 12:44 PM
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- IPMMan
- Xavier Asbridge, owner of IPM of New Hampshire, is a Paul Smiths College graduate. After college he worked 20 years for the Connecticut Agricultural Experiment Station where he was involved in the identification and control of pests. He was one of the first in the country to deal with the Asian Longhorned Beetle, surveying CT forests and ports. Xavier also participated in research and control of other invasive species such as Hemlock Woolly Adelgid and Gypsy moth. His supporting role in such projects gave him the opportunity to work with some of the leading scientists in the field. Acknowledgments in Publications Pseudoscymnus tsugae in Connecticut Forests: The First Five Years Carole A. S.-J. Cheah and Mark S. McClure na.fs.fed.us/fhp/hwa/pubs/proceedings/2002_proceedings/first_five.pdf Important Mortality Factors in the Life Cycle of Hemlock Woolly Adelgid na.fs.fed.us/fhp/hwa/pubs/proceedings/2002_proceedings/important.pdf Biological control of Hemlock Woolly Adelgid www.invasive.org/hwa/hwa.pdf NH Certified Arborist.
Disclaimer
Recommendations for the use of chemicals are included in this blog as a convenience to the reader. The use of brand names and any mention of commercial products or services in this blog does not imply endorsement by IPM OF NEW HAMPSHIRE nor discrimination against similar products or services not mentioned. Individuals who use chemicals are responsible for ensuring that the intended use complies with current regulations and conforms to the product label. Be sure to obtain current information about usage and examine a current product label before applying any chemical. For assistance, contact an agent of the Cooperative Extension Service in your county. Some products are mentioned only for informational purposes as it is against the law to use any product to control pests if it is not registered for that purpose. Even using something as innocuous as vinegar to control weeds is not a legal use. Always read and follow label directions of any pesticide.
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