﻿CONTENTS. 
  

  

  Page. 
  

   Spraying 
  experiments 
  against 
  the 
  grape 
  leafhopper 
  in 
  the 
  Lake 
  Erie 
  Valley 
  

  

  in 
  1911 
  Fred 
  Johnson. 
  . 
  1 
  

  

  Introduction 
  1 
  

  

  Treatment 
  of 
  nymphs 
  of 
  the 
  grape 
  leafhopper 
  with 
  contact 
  sprays 
  1 
  

  

  Field 
  experiments 
  with 
  tobacco 
  extracts 
  2 
  

  

  Vineyard 
  experiments 
  in 
  1911 
  3 
  

  

  Use 
  of 
  combined 
  contact 
  and 
  poison 
  spray 
  9 
  

  

  Effect 
  of 
  grape 
  leafhopper 
  control 
  on 
  quality 
  of 
  fruit 
  10 
  

  

  Conclusion 
  12 
  

  

  The 
  grape-berry 
  moth 
  (Polychrosis 
  viteana 
  Clem.), 
  Fred 
  Johnson 
  and 
  A. 
  G. 
  

  

  Hammar 
  15 
  

  

  Introduction 
  15 
  

  

  History 
  17 
  

  

  Origin 
  and 
  distribution 
  18 
  

  

  Food 
  plants 
  20 
  

  

  Occurrence 
  of 
  the 
  grape-berry 
  moth 
  in 
  destructive 
  numbers. 
  21 
  

  

  Habits 
  of 
  the 
  adult 
  or 
  moth 
  22 
  

  

  Hafjits 
  and 
  character 
  of 
  injury 
  of 
  the 
  larva 
  23 
  

  

  Destructiveness 
  of 
  the 
  larva 
  26 
  

  

  Other 
  insects 
  whose 
  injury 
  to 
  grape 
  berries 
  resembles 
  that 
  caused 
  by 
  the 
  

  

  larva 
  ef 
  the 
  grape-berry 
  moth 
  26 
  

  

  Description 
  28 
  

  

  Seasonal 
  history 
  30 
  

  

  Life-history 
  studies 
  in 
  1909 
  30 
  

  

  Spring 
  brood 
  of 
  moths 
  30 
  

  

  Time 
  of 
  emergence 
  of 
  spring 
  brood 
  of 
  moths 
  30 
  

  

  Oviposition 
  of 
  spring-emerging 
  moths 
  in 
  confinement. 
  31 
  

  

  Length 
  of 
  life 
  of 
  spring 
  brood 
  of 
  moths 
  32 
  

  

  First 
  generation 
  32 
  

  

  Incubation 
  period 
  of 
  first-brood 
  eggs 
  32 
  

  

  Length 
  of 
  feeding 
  period 
  of 
  first-brood 
  larvae 
  33 
  

  

  Length 
  of 
  pupal 
  stage 
  of 
  first-brood 
  pupa? 
  33 
  

  

  Time 
  of 
  emergence 
  of 
  first-brood 
  moths 
  34 
  

  

  Oviposition 
  of 
  first-brood 
  moths 
  35 
  

  

  Hibernation 
  of 
  first-brood 
  pupae 
  36 
  

  

  Length 
  of 
  life 
  cycle 
  of 
  first 
  generation 
  37 
  

  

  Second 
  generation 
  

  

  Incubation 
  period 
  of 
  second-brood 
  eggs 
  38 
  

  

  Length 
  of 
  feeding 
  period 
  of 
  second-brood 
  larvae 
  38 
  

  

  Date 
  second-brood 
  larvae 
  leave 
  fruit 
  39 
  

  

  Miscellaneous 
  rearing 
  records 
  for 
  the 
  seasons 
  of 
  1907 
  and 
  1908 
  H 
  

  

  Summary 
  of 
  life-history 
  studies 
  of 
  the 
  grape-berry 
  moth 
  H 
  

  

  Parasitic 
  enemies 
  I 
  r> 
  

  

  Degree 
  of 
  vineyard 
  infestation 
  in 
  Erie 
  County, 
  Pa 
  19 
  

  

  