Henryville Flyfishers Club, Pocono Mountains Pennsylvania

Saving the Hemlocks that Protect Pristine Trout Habitat

Henryville Flyfishers Club, Pocono Mountains Pennsylvania



• Massive Hemlock Woolly Adelgid (HWA) onslaught from neighboring land
• Previous pesticides applications of Imidacloprid could not prevent spread of HWA
• Loss of Hemlocks and foliage which leads to warming, evaporation, erosion, sedimentation, etc
• Ultimate threat to the population of Native Brook Trout and prime stock for Catch and Release


• Evaluation and Development of a Comprehensive Management Plan, Fall 2008
• 20 Keystone trees were trunk-injected for immediate reduction of HWA, Fall 2008
• The same 20 trees received soil injection of Essential Plus micro-nutrient fertilizer, Spring 2009
• 2,500 adult Sasajiscymnus tsugae (S. tsugae) predator beetles were released, Summer 2009


• 85-100% reduction in HWA on Trunk-injected Keystone Trees
• 6-10” new growth on tips of trees fertilized with Essential Plus
• 10-14” new growth observed with fuller foliage at all beetle release locations
• 5-year Success! S. tsugae beetle areas remain healthiest! HWA populations are still manageable
• Tree-Savers continues to monitor and address all stream-side hemlock trees with matching results


Henryville Flyfishers Club Restoration Story
By: Jayme Longo, January 22, 2014

Saving the Hemlocks of Henryville

Henryville Flyfishers Club first came to the attention of director of Tree-Savers, Jayme Longo in 2008. The club was in need of an attentive hemlock specialist and the versatile, personal approach of Longo was a good fit for the concerned members of Henryville Flyfishers.
The club owns a stretch of approximately 5 miles along the beautiful Paradise Creek in the Pocono Mountains. 90-95% of the property is comprised of Eastern Hemlock that includes a mountain rising above the stream, an extensive roadside buffer, and most importantly, the banks of the club’s valuable waters.

Seven years ago, the invasive pest Hemlock Woolly Adelgid (HWA) was identified as the culprit for declining health in the club’s forests. Henryville Flyfishers took immediate action to preserve their hemlocks. With no available alternative, the initial action was limited to application of systemic pesticides. Unfortunately, the imminent spread of HWA extended so far that the scope of chemical applications could not hope to compete with a reasonable budget and acres of endangered hemlocks. A sustainable method would be needed to control this pest.


In September of 2008, a comprehensive management plan was enacted by Longo and Henryville Flyfishers to seriously combat HWA. Trees along the stream had already lost more than 50% of their needles and required immediate action to prevent erosion. 20 keystone trees were treated with systemically via trunk injection to kill as much HWA as possible before further damage could take place. Application of a root-stimulating micro-nutrient fertilizer followed in Spring of 2009 to replace nutrients already lost to the pest.

With thousands of trees left untreated, a biological control plan was proposed to bring the forest back into balance and to prevent a lifetime of dependency on pesticides applications.

In July of 2009, 2,500 adult Sasajiscymnus tsugae (S. tsugae) beetles were strategically deployed in colonies of 100-250 in areas of dense hemlock foliage with large populations of HWA. Areas previously treated with pesticides were carefully avoided.


In April 2010, Henryville Flyfishers property was re-evaluated and the beetle release sites were revisited. The first success noted was an 85-100% reduction in HWA on trees treated systemically with Imidacloprid. Having shown no new growth previously, they now exhibited 6-10” new growth and shoots. This is likely due to the fertilization with Essential Plus. 10-14” new growth on average was documented in areas where beetle releases took place.


As of November 2013, Henryville’s hemlock trees remain a testament to success with Biological Control. The club continues to have bi-annual inspections (Spring and Fall of each year) to monitor HWA and the health of their hemlocks. Treatments today, thanks to the establishment of S. tsugae beetles, are supplemental at most.

Henryville Flyfishers are exceptionally proud of our combined efforts and have remained a steady support for Biological Control.

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