CONTENTS 



Introductory 4^ 



Injuries to trees 4i 



Object of bulletin 4^ 



White marked tussock moth, Notolophus leucostigma 4^ 



Characteristics 42 



Life history 43 



Remedies 43 



Elm leaf beetle, Galerucella luteola 44 



Characteristics 44 



Remedies . . 45 



Elm bark louse, Gossyparia ulmi 46 



Characteristics 46 



Remedies 46 



Tent caterpillars, Clisiocampa disstria : Clisiocampa americana 46 



Characteristics 47 



Life history 47 



Remedies 47 



Fall web worm, Hyphantria cunea 48 



Remedies 49 



Borers in trunk and limbs 49 



Indications of attack 49 



Elm and maple borers ^ 49 



Pigeon Tremex 50 



Leopard moth 50 



Remedies 51 



Cottony maple tree scale insect, Pulvinaria innumerabilis 52 



Remedies . 52 



Value of our native birds 52 



Spraying trees 53 



Rules for spraying 53 



Proper apparatus 54 



Arsenical compounds 55 



Contact insecticides 56 



Explanation of plates 57 



Index 59 



