INDEX. 



Page. 



Adalia bipunctata, enemy of hop aphis ,. 23 



Anthocoris sp . , enemy of hop aphis 23 



Ants, relation to hop aphis 19 



Aphides on shrubs and trees near hopyards mistaken for hop aphis 21 



Aphis, hop, bibliography of more important writings 38-39 



control axioms 23 



measures 23-37 



on prune 31 



recommendations, summary 37 



damage, nature 21-22 



deposition of young 14-15 



early history 9 



economic importance , 9-10 



effect, general, upon hops 21-22 



of heat thereon 20-21 



eggs, winter 17-18 



emergence from hibernation 12 



enemies, natural 22-23 



favorable and unfavorable conditions therefor 20-21 



field observations, importance in control work 31 



operations in control 32-35 



first appearance in season 20 



food plants 21 



generations, number on host 13 



growth, rate 15-16 



habitation 19 



habits 19-20 



head compared with that of melon aphis 15 



hibernation 10 



emergence therefrom 12 



insecticides used in control 23 



life history 10-19 



losses due to its work 10 



migrants, fall 17 



summer, theory regarding them 18-19 



migratory activities 13-14 



migrating forms 13 



necessity for thorough work in control 24 



number of spray applications used in control 24 



young deposited by viviparous females. 16-17 



on hop roots 10-12 



procrastination in control work, results 24 



protection 19 



relation of ants thereto 19 



41 



