Insect & Disease Management

Although maintaining a tree in good health is the first line of defense against harmful insects and diseases, even healthy trees sometimes experience pest-related problems. At Guardian, we approach insect, mite, and disease problems through Integrated Pest Management (IPM). This process begins with an accurate identification of the species and the pest. We then work together with you to determine an adequate threshold level, and we recommend pesticides only when this kind of treatment is necessary. Our technicians are state certified and trained to handle and apply these chemicals in a safe and appropriate manner.

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Pesticide Risk Benefits Information


Common Insect Problems

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Black Vine Weevil

Bronze Birch Borer

Spruce Gall Adelgids

Eastern Tent Caterpillar

Emerald Ash Borer

Fall Webworm

Japanese Beetle

Leaf Miner

Maple Petiole Borer



Spider Mites

White Pine Weevil

Zimmerman Pine Moth


Common Disease Problems

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Apple Scab

Black Knot Disease

Cytospora Canker

Dutch Elm


Needle Cast

Oak Wilt

Phomopsis Blight

Powdery Mildew


Tar Spots

Tip Blight

Verticillium Wilt

Guardian was prompt, efficient & friendly at every step. — Mike L.