﻿6 
  • 
  THE 
  BEAN 
  THEIPS. 
  

  

  Page. 
  

  

  Seasonal 
  history 
  in 
  the 
  Imperial 
  Valley 
  37 
  

  

  Egg 
  period 
  '. 
  37 
  

  

  Larval 
  period 
  38 
  

  

  Prepupal 
  and 
  pupal 
  periods 
  38 
  

  

  Seasonal 
  history 
  at 
  Tempe, 
  Ariz 
  .... 
  1 
  33 
  

  

  Hibernation 
  39 
  

  

  Notes 
  on 
  occurrence 
  40 
  

  

  Natural 
  control 
  40 
  

  

  Rains 
  40 
  

  

  Natural 
  enemies 
  41 
  

  

  Artificial 
  control 
  42 
  

  

  Cultural 
  methods 
  42 
  

  

  Spraying 
  43 
  

  

  Distributing 
  the 
  parasites 
  . 
  44 
  

  

  Bibliography 
  " 
  44 
  

  

  Index 
  47 
  

  

  LLUST 
  RATIONS. 
  

  

  Page. 
  

  

  Fig. 
  1. 
  Side 
  view 
  of 
  the 
  head 
  of 
  a 
  thrips, 
  showing 
  the 
  mouthparts 
  8 
  

  

  2. 
  The 
  bean 
  thrips 
  (Heliothrips 
  fasciatus) 
  : 
  Adult 
  female 
  and 
  details 
  9 
  

  

  3. 
  The 
  bean 
  thrips: 
  Eggs 
  10 
  

  

  4. 
  The 
  bean 
  thrips: 
  First-stage 
  larva 
  11 
  

  

  5. 
  The 
  bean 
  thrips: 
  Second-stage 
  larva 
  12 
  

  

  6. 
  The 
  bean 
  thrips: 
  Prepupa 
  - 
  12 
  

  

  7. 
  The 
  bean 
  thrips: 
  Pupa 
  13 
  

  

  8. 
  Map 
  showing 
  present 
  known 
  distribution 
  of 
  the 
  bean 
  thrips 
  (Heliothrips 
  

  

  fasciatus) 
  15 
  

  

  9. 
  Alfalfa 
  showing 
  injury 
  by 
  the 
  bean 
  thrips 
  29 
  

  

  10. 
  The 
  bean 
  thrips: 
  Prepupae 
  parasitized 
  by 
  Thripoctenus 
  russelli 
  41 
  

  

  11. 
  A 
  hymenopterous 
  parasite, 
  Thripoctenus 
  russelli: 
  Adult 
  42 
  

  

  