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Top 5 Damaging Insects You Need to Watch for on Trees & Shrubs

2018-Top-5-Damaging-Insects-You-Need-to-Watch-for-on-trees-and-shrubs-headerWhen damaging insects attack a tree, insect control by the professionals at Giroud Tree and Lawn may be required. The signs of insect infestation are unmistakable. Holes in the trunk from exit wounds, chewed leaves, sparse leaf development and excessive deadwood are just a few of the key indicators. Here are the Top 5 Damaging Insects you need to look for right now on your Trees & Shrubs!







Eastern Tent Caterpillars

There’s no mistaking these creepy crawlies by their signature tent-like webs, which are constructed in the crotches of tree branches. Eastern Tent Caterpillars have a taste for a wide variety of trees, so homeowners need to be on the lookout in spring time for any signs of an infestation. 

Not only are the webs unsightly, Eastern Tent Caterpillars can severely defoliate a tree. Defoliation will weaken the tree, making it more susceptible to invasion by secondary insect and disease pests. Treatment for these caterpillars is most critical early in the season, so if you see them in your trees, call your Giroud ISA Certified Arborist right away for an inspection!




2018-Top-5-Damaging-Insects-You-Need-to-Watch-for-on-trees-and-shrubs-Emerald-Ash-Borers-FactsEmerald Ash Borers

These beautiful yet pervasive insects are a 100% Fatal Pest, and they are decimating Ash Trees all across the country. The adult beetles swarm the trees and leave their larvae underneath the bark. The larvae then feed on the tree, cutting off water circulation throughout the tree.

Unfortunately, anyone with an Ash tree faces a difficult decision. Protect the Ash tree from Emerald Ash Borer with treatment or let it die and remove it. Without treatment, Ash Trees with Emerald Ash Borer die within 1-3 years. By the time you see visible decline, Emerald Ash Borer has already done significant internal damage to the tree. That’s why, it’s critical to treat now before damage is beyond repair.




2018-Top-5-Damaging-Insects-You-Need-to-Watch-for-on-trees-and-shrubs-Leafminer-FactsLeaf Miner 

Leafminers emerge in springtime to mate and lay eggs.  Once the eggs hatch, the young larvae begin feeding on the leaves. Oftentimes, homeowners can’t see the actual insects but become aware of an infestation once the leaves develop yellow or brown raised blotches. Leaf Miners attack Birch trees, Boxwoods and Hollies.  The best protection is to keep the plant healthy.

Your Giroud ISA Certified Arborist can monitor your high risk plants and develop a treatment protocol if the pest is found. If you see evidence of Leafminer damage, don’t wait! Call Giroud ASAP to schedule a FREE Inspection!







Sawfly can affect Pines, Spruces, and even Roses, so it’s important to be on the lookout for evidence of their hungry little larvae. They will munch through leaves and pine needles, defoliating and weakening the tree or bush. 

Needles on infested trees appear dry and strawlike. Repeated defoliation severely stunts the growth of the tree and results in a thin, unsightly appearance.

Infested Rose leaves will appear papery thin and browned at the edges. “In general, light to moderate infestations (on roses) are cosmetic in nature and rarely harm the host plant.” explains Missouri Botanical Garden. “Heavier attacks, however, can weaken plants when leaf loss stresses them to the point of vulnerability to other insect and disease attacks.” Which is why it is important to have a Giroud ISA Certified Arborist do an evaluation if you see signs of sawfly damage.



2018-Top-5-Damaging-Insects-You-Need-to-Watch-for-on-trees-and-shrubs-Lacebugs-FactsLace Bugs

The name of this insect sounds lovely, but don’t let that fool you. Lace Bugs can cause serious damage! In the Philadelphia area, Lace Bugs attack azaleas, birch, hawthorn and pieris japonica. These thirsty pests voraciously suck fluid from leaves.  Damage can be severe including leaf discoloration, loss of vigor and premature leaf drop. 

Yellow, white or brown raised spots on leaves are a warning sign.  In cases of severe Lace Bug infestation, the plant may have large patches of brown. Plants should be monitored regularly for signs of Lace Bug infestation, so if you see signs, don’t hesitate to schedule a FREE inspection with your Giroud Arborist!



If you have any concerns about your trees and shrubs, give Giroud a call at 215-682-7704. Your ISA Certified Arborist can do a FREE inspection and help determine the best course of action!



Author: Jeanne Hafner

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