As fall settles in across New Jersey, trees become more vulnerable to increased pest activity. During this season, insects and pests are busy preparing for winter by feeding, laying eggs, and seeking shelter—often at the expense of your trees. The change in temperature and the shifting environment provide the perfect conditions for various pests to thrive, potentially causing harm that could last into the next growing season.
From sap-sucking insects like scales to destructive borers like the Bronze Birch Borer, fall brings its own set of threats to your landscape. Taking preventive action now is key to protecting your trees from infestations that can compromise their health and structural integrity.
1. Hemlock Woolly Adelgid
The hemlock woolly adelgid is a serious threat to New Jersey’s hemlocks, attacking by feeding on the tree’s sap, which causes needle loss and can lead to death if untreated. Fall is the perfect time to control this pest by targeting overwintering eggs, helping to prevent the emergence of spring crawlers.
How to Protect Your Trees:
- Apply Horticultural Oil: Use oil sprays during fall to suffocate eggs before they hatch.
- Professional Treatment: In more severe cases, seek an arborist for systemic insecticides to protect your trees long-term.
2. Bronze Birch Borer
This pest primarily targets birch trees, causing dieback in the upper canopy by burrowing under the bark and disrupting nutrient flow. Birch trees stressed by drought or poor conditions are particularly susceptible in the fall.
How to Protect Your Trees:
- Monitor for Signs: Look for thinning crowns or D-shaped exit holes on the bark.
- Fertilize and Water: Keep trees healthy with proper watering and fertilization, as stressed trees are more likely to be attacked.
- Systemic Insecticides: An arborist can apply insecticides that target the larvae before they cause extensive damage.
3. Scale Insects
Scale insects feed on tree sap, weakening trees and leaving behind honeydew, which promotes sooty mold. These pests are often found on maples, oaks, and fruit trees, particularly in fall when they are preparing for overwintering.
How to Protect Your Trees:
- Apply Horticultural Oil: Treat trees in the fall to suffocate scale insects before winter.
- Prune Infested Branches: Remove heavily infested limbs to reduce pest populations.
4. Spotted Lanternfly (SLF)
- Inspect and Remove: Look for clusters of spotted lanternfly eggs on tree trunks, rocks, and outdoor surfaces. Scrape them off and destroy them.
- Use Sticky Bands: Wrap tree trunks with sticky bands to trap nymphs as they climb the tree.
- Call Professionals: If the infestation is severe, contact a tree care professional to assess and treat the problem.
5. Bagworms
Bagworms create silk bags on trees and shrubs where they feed and lay eggs. Fall is the time to remove these bags, as it prevents them from hatching in spring and causing further damage.
How to Protect Your Trees:
- Manually Remove Bags: Prune off and destroy bags before winter.
- Insecticide Treatment: If infestation is widespread, contact an arborist for professional treatment.
Safeguarding Your Trees from Fall Tree Pests in New Jersey
As fall progresses, various pests become more active, seeking refuge and food sources in trees. While we’ve covered some of the common pests that appear this season, there are many more we simply can’t fit into one blog post. To bolster your trees’ defenses, consider these essential practices:
- Mulch and Water: Apply mulch around your trees to retain moisture and provide insulation, especially during the drier periods of fall.
- Prune: Regularly prune dead or diseased branches to reduce hiding spots for pests that might overwinter in your trees.
- Inspect: Make it a habit to check your trees frequently for any early signs of pest activity, allowing you to take action before infestations escalate.
By maintaining a proactive approach and implementing these strategies, you can support your trees’ health throughout the fall and minimize the risks associated with pest damage. Should you encounter severe infestations, don’t hesitate to consult a certified arborist for professional assessment and treatment.