CONTENTS 



About Insects 1 



Aphid's or Plant Lice .... 2 



Scale Insects 2 



Borers 2 



Leaf Eaters 3 



Mites . 3 



Gall-Producing Insects 



and Mites 3 



About Trees and Shrubs 



and Their Pests .... 3 



Ailanthus (Tree of Heaven) . . 3 

 Ailanthus Webworm .... 3 

 Cynthia Moth 5 



Arborvitae 5 



Bagworm 5 



Arborvitae Leaf Miner ... 6 

 Spruce Spider Mite .... 6 

 Juniper Scale 6 



Ash 6 



Red-Headed Ash Borer ... 6 



Ash Borer 7 



Oystershell Scale 8 



Fall Webworm 9 



Birch 11 



Bronze Birch Borer 11 



Birch Skeletonizer 11 



Boxelder 11 



Boxelder Bug 11 



Boxelder Aphid 12 



Eastern Tent Caterpillar ... 12 



Boxwood 14 



Boxwood Leaf Miner .... 14 



Catalpa 14 



Catalpa Sphinx 14 



Comstock Mealybug .... 16 



Crabs and Hawthorns .... 16 

 Yellow-Necked Caterpillar . . 16 

 Woolly Hawthorn Aphid ... 16 



European Red Mite 18 



San Jose Scale 18 



Hawthorn Leaf Miner .... 20 



Dogwood 20 



Dogwood Borer 20 



Dogwood Scale 20 



Douglas Fir 20 



Cooley Spruce Gall Aphid . . 20 



Elm 21 



Spring Cankerworm .... 21 

 White-Marked Tussock Moth . 23 



Fall Webworm 24 



Elm Leaf Beetle 24 



European Elm Scale .... 26 



Scurfy Scale 26 



Putnam Scale 28 



Elm Leaf Aphid 29 



Woolly Elm Aphid 29 



Elm Cockscomb Gall Aphid . . 29 

 Elm Borer 29 



Smaller European 



Elm Bark Beetle .... 31 

 Banded Elm Leafhopper ... 33 

 Mites 33 



Euonymus 33 



Euonymus Scale 33 



Hackberry 35 



Hackberry Nipple Gall Psyllid 35 

 Witches'-Broom 36 



Hickory 36 



Yellow-Necked Caterpillar . . 36 

 Hickory Bark Beetle .... 36 

 Hickory Gall Phylloxera ... 37 

 Hickory Horned Devil 



or Regal Moth 37 



Juniper 37 



Juniper Scale 37 



Juniper Webworm 38 



Juniper Bark Beetle .... 38 

 Spruce Spider Mite .... 39 

 Bagworm 39 



Lilac 40 



Lilac Borer 40 



Oystershell Scale 40 



Linden 40 



Elm Spanworm 40 



Locust 40 



Locust Borer 40 



Bagworm 43 



Locust Mite 43 



Mimosa Webworm 43 



Maple 43 



Cottony Maple Scale .... 43 

 Maple Bladder-Gall Mite . . 45 

 Green-Striped Mapleworm . . 46 

 Flatheaded Apple Tree Borer . 46 



Aphids 47 



Pigeon Tremex 47 



Oak 48 



Borers 48 



Periodical Cicada 48 



May Beetles 48 



Twig Pruner 48 



Oak Kermes .50 



Leaf Miners 51 



Gall-Producing Insects ... 53 



Pine 53 



Sawflies 53 



White-Pine Weevil 54 



Pine Needle Scale 54 



Pine Bark Aphid 57 



European Pine Shoot Moth . . 57 

 Nantucket Pine Moth .... 57 

 Zimmerman Pine Moth ... 58 



Poplar 59 



Poplar Borer 59 



Cottonwood Borer 59 



Poplar and Willow Borer . . 59 



