Cultural controls are management techniques that help to ensure healthy hemlock trees. They involve simple physical actions property owners can take and in general are most appropriate for ornamental landscape trees.
■ Keep ornamental hemlocks mulched and watered during prolonged droughts. Mulch made from bark or shredded hardwood is more effective and longer lasting than pine straw; it should be applied about 3 inches thick out to the drip line but pulled back from the trunk a couple of inches so as not to encourage fungal growth or other insect infestation. Trees require about an inch of water per week; click here for a Water Needs Chart showing how much water trees of different sizes need -- you'll be surprised!
■ If you go hiking, camping, fishing, etc. in an infested area, your gear and clothes may be carrying adelgid eggs or crawlers, so take care not to spread them to uninfested trees.
■ Don't bring saplings from infested areas onto your property.
■ Don't place bird feeders or deer feeders near hemlock trees; birds and deer can spread HWA eggs and crawlers for long distances.
■ Don't fertilize infested trees until you have the HWA infestation under control as this would encourage new growth and attract even more adelgids.
■ Do normal "forest management" by thinning your hemlocks so the best ones have a better chance to survive. This means cutting hemlocks that are growing too close to each other (unless you're using them for a hedge), that are physically damaged or dead, or that you don't intend to save. It is not necessary to burn, chip, shred, or haul away the cut trees; when the tree is cut, the sap dries up and adelgids that are feeding on the tree will die.
■ Keep a watchful eye on your hemlocks and be prepared to take action at the first sign of woolly adelgids.
■ If you don't intend to use chemical or biological controls, you can remove some of the adelgids mechanically by picking them off, pruning the infested branches, or using a high-pressure water hose.
Care and Maintenance of Hemlocks
Healthy hemlocks are not only more beautiful than stressed unhealthy ones, but they also stand a better chance of longer survival if they are attached by disease or insect pests. Because proper planting and maintenance are important for the long-term health of your hemlocks, here are some documents you may find helpful. These documents are also included on the Resources and/or Facilitators page of our web site.
■ Caring for Your Hemlock Sapling (updated 12/31/14) -- Handout of easy-to-follow instructions to plant and care for potted hemlock saplings 11/2 - 6' tall in landscape or forest settings.
■ Caring for Your Hemlock Seedling (updated 12/31/14) -- Handout of easy-to-follow directions for children and their families to plant and care for hemlock seedlings 6 - 18" tall that have been temporarily potted in biodegradable newspaper cups.
■ Planting or Transplanting a Hemlock (updated 12/9/14) -- Complete step-by-step instructions for planting a containerized or balled-and-burlapped hemlock tree 11/2 - 8' tall or transplanting one 11/2 - 5' tall from the woods.
■ Potting Hemlock Seedlings & Saplings (updated 12/9/14) -- Complete step-by-step instructions for digging hemlock seedlings or saplings 1 - 5' tall from the woods and potting them for future planting or offering for adoption.
■ Volunteer Project: Hemlock Sapling Rescue (New 3/17/15) -- This document provides instructions for SGH personnel rescuing hemlock saplings from sites where they are not being treated and where the property owner or manager has given permission. Rescued saplings are usually potted as part of the overall rescue project, but occasionally they may be taken home for potting. The potted saplings are retained by SGH to be offered for adoption at fairs and festivals, donated to schools and nonprofits, or used for reforestation projects.
NOTE: Hemlocks that are growing in a forested setting and that are not suffering from disease or insect pests normally do not need supplemental fertilizers once established. They may, however, benefit from extra water if it is possible to get it to them during prolonged periods of drought.
Advantages of Cultural Controls
Cultural controls are usually easy for a property owner to do and require only some time and effort. They are an "all natural" approach that can help your hemlocks in their struggle to survive.
Disadvantages of Cultural Controls
Cultural controls will not eradicate the adelgids once they arrive on your property. They provide no long-term protection, and property owners should use them in combination with chemical controls.
© Save Georgia's Hemlocks
2009. Last updated