CONTENTS 



Introduction 5 



Recognition Marks 6 



Nature and Extent of Injur.v 8 



Life History and Habits lo 



Control 13 



Determining Whetiier Control ^Measures are Necessary 13 



The Problem 13 



Destroying the Aphis in the Fall 14 



Destroying the Aphis in the Egg Stage 14 



Destroying the Aphis in the Spring and Sinnmer 15 



Conclusions 26 



ILLUSTRATIONS 



Effect of proper si.Mayint;, Cover 



First stage of the green, tlie rosy and the oat aphis 6 



Injury to foliage 8 



Injury to fruit 9 



Trees not properly sprayed for aphis 22 



Trees properly sprayed for aphis 23 



Stages in bud development 25 



(4) 



