Pest Alert – Elongate Hemlock Scale

— Written By
en Español

El inglés es el idioma de control de esta página. En la medida en que haya algún conflicto entre la traducción al inglés y la traducción, el inglés prevalece.

Al hacer clic en el enlace de traducción se activa un servicio de traducción gratuito para convertir la página al español. Al igual que con cualquier traducción por Internet, la conversión no es sensible al contexto y puede que no traduzca el texto en su significado original. NC State Extension no garantiza la exactitud del texto traducido. Por favor, tenga en cuenta que algunas aplicaciones y/o servicios pueden no funcionar como se espera cuando se traducen.

English is the controlling language of this page. To the extent there is any conflict between the English text and the translation, English controls.

Clicking on the translation link activates a free translation service to convert the page to Spanish. As with any Internet translation, the conversion is not context-sensitive and may not translate the text to its original meaning. NC State Extension does not guarantee the accuracy of the translated text. Please note that some applications and/or services may not function as expected when translated.

Collapse ▲

Hemlocks have been nearly wiped out by Hemlock Wooly Adelgid (HWA) insect. Hundreds of millions of the trees were killed over the last few decades by HWA from Maine to Georgia. The few hemlocks that are left should be protected.

Hemlock Wooly Adelgid isn’t the only pest of hemlocks. The rosellina blight fungal disease, spider mites, and Elongate Hemlock Scale are all parasitic organisms that weaken hemlock trees in landscapes.

elongate hemlock scale

Feeding

Elongate Hemlock Scale (EHS) is a sucking insect. Adults insert a needle-like mouthpart into the tree tissue and drink the sugary liquid. The insects live on the underside of the needles.

Signs

Often scale feeding is associated with sooty mold, a black fungus that grows on the sugary droppings of scale insects. Another sign of the insects is a white fuzz created by adult males. Finally, needles can turn yellow and start to drop off.

hemlock elongate scale

Treatment

According to the NC State Publication on EHS, “Materials that control EHS include…Safari (dinotefuran) …Safari… provided the most consistent and long lasting control.”

Safari is a systemic insecticide. It can be applied as a soil drench or bark spray  for home gardeners with large trees. Also, good control with combining a Safari (dinotefuran) bark spray early spring and a horticulture oil foliar spray in the winter to coat any existing egg masses. See the product label for rates and instructions.

*Inclusion of product names neither implies effectiveness, nor endorsement by the author or NC State University. Not all products described may be locally available, and the active ingredient content may be changed by manufacturers. Read the label CAREFULLY and follow all label instructions whenever using any pesticides as required by the EPA.