Invasive Hemlock Woolly Adelgid (HWA) is decimating America’s Eastern Hemlock Forests.



Biological Control of Hemlock Wooly AdelgidDiseas – St BEETLE FACTS

“The best option for managing Hemlock woolly adelgid in forests is biological control.”
U.S. Department of Agriculture 2005

The more you know about biological control of Hemlock Wooly Adelgid (HWA) using the S.tsugae beetle (Sasajiscymnus tsugae), the better chance we all have of saving our majestic Hemlock Forests. This involves answering questions and addressing common concerns about the S.tsugae beetle.

FACT #1: Is there any chance the beetles, being non-native, could cause other environmental problems?

No. S.tsugae beetles have been tried and tested in the Eastern US for well over a decade now. We’ve worked closely with the US Forestry Service since 2001 and have documentation that the beetle poses no threat to anything other living organism than the HWA. They have 2 purposes -to eat HWA and reproduce. Research has never discovered any negative environmental impacts as a result of S.tsugae beetles.

FACT #2: Once the beetles eat all of the HWA, won’t they just die?

No. The life cycle of the S.tsugae beetle is synchronized with HWA. The more HWA, the more S.tsugae beetle larvae will be produced. The less HWA, the less larvae will be produced. The population of the S.tsugae beetle is determined by the population of HWA. Third, when Beetles do migrate to another HWA infested tree, they leave behind a successor generation. The tree is not abandoned.

FACT #3: How fast will my Hemlocks recover?

S.tsugae beetles are highly efficient predators. Both adult and larvae S.tsugae beetle feed on ALL life stages of HWA. Each St adult and larvae can consume up to 500 HWA eggs per week and 100 HWA nymphs. The S.tsugae beetle has a voracious appetite for HWA and St Larvae even more so. S.tsugae beetles consume 86-99% of HWA found in the wild. Hemlocks can recover in as little as 1-2 years. Best of all – they stay recovered.

As the tree gets stronger, it regains its natural defense mechanisms to fight off other threats/pests. As the S.tsugae beetle controls HWA, the hemlock becomes more capable of taking care of itself.

FACT #4: How can I get S.tsugae beetles on my Hemlocks?

Until now, S.tsugae beetles have only been raised in research laboratories for distribution to the U.S. Forestry Service. Though government sponsored laboratories have done their best to meet the demand, there simply has not been enough S.tsugae beetles to meet the infestation of the Hemlock Woolly Adelgid (HWA).

That’s changed. Tree Savers™has developed the first-ever private high-volume biological control laboratory designed for the exclusive production, distribution, and release of the S.tsugae beetle in both private and public hemlock forests. In fact, Tree Savers™ is the only American company currently providing the S.tsugae beetle to private landowners and the general public.

To learn more about this amazing little HWA eating ladybug and how you can get the S.tsugae beetle on your hemlocks, visit our website We’ll help you diagnose your hemlocks, help you determine how many S.tsugae beetles you’ll need, provide the beetles, and guide you through the process of releasing them. You can also download our free “Guide to Saving Your Hemlocks.”

There is no reason why your hemlocks have to die from the invasive HWA infestation. In fact, by helping us to save your hemlocks, we’ll both be doing our part to save entire hemlock forests. Call or email Tree Savers™ today!

(570) 871-0088

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