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Controlling Hemlock Woolly AdelgidHemlock woolly adelgid is a small insect that infests hemlock trees. Feeding on the sap of young twigs, hemlock woolly adelgid retards or prevents tree growth and causes needles to drop prematurely. The loss of new growth and needles seriously impairs a tree’s health and can result in defoliation and tree death in as little as two years. With the increasing presence of this insect in our area, it is prudent to maintain a watchful eye on valued hemlock plantings. Signs of infestation include small, white, cottony masses at the base of needles, particularly on the underside of stems. While present throughout the year, they are most prominent in early spring. In cases of advanced infestation, the tree may also have dull or yellowing foliage.
Cedar Lawn Tree Service has certified arborists who can inspect your trees and provide treatment, if necessary. Click here to make an online request for information or service, or feel free to call our office. |
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Because this insect has several reproductive cycles annually and lacks natural predators here, damaging populations
can build quickly. Control
options are available and should be implemented before damage becomes too noticeable, as tree recovery will become impaired. The key to
successful management is preventing this pest from becoming thoroughly established on your property. Timely monitoring of hemlocks for
the presence of the insect and taking appropriate treatment measures when discovered is essential. Pest levels can be managed even when
neighboring trees are left untreated. 
Spray applications of horticultural oil, which can be applied in spring, summer or fall, are effective as long as
thorough coverage is obtained. While
most insects’ feeding activity wanes as cool weather approaches, hemlock woolly adelgid actually becomes more active as temperatures begin
to drop, so fall is an excellent time for controlling this insect pest. Other control options, such as systemic treatments, are available
if factors such as tree size or location dictate an alternative approach. Some types of systemic treatments require up to several months
for product uptake and distribution within trees, but provide an extended period of protection.