﻿74 
  

  

  drying 
  up 
  and 
  being 
  harvested, 
  the 
  bugs 
  have 
  been 
  leaving 
  it 
  for 
  the 
  

   last 
  two 
  vpeeks 
  and 
  are 
  making 
  a 
  second 
  invasion 
  of 
  the 
  corn." 
  

  

  Auf/usf 
  S. 
  Fields 
  had 
  been 
  flooded 
  with 
  heavy 
  rains 
  two 
  or 
  three 
  

   weeks 
  previously. 
  Adults 
  practically 
  all 
  gone, 
  and 
  very 
  few 
  young 
  

   to 
  be 
  found. 
  Possibly 
  swept 
  away 
  by 
  floods. 
  Many 
  bodies 
  covered 
  

   with 
  Sporotrichum 
  found 
  ])eneath 
  corn 
  stalks 
  and 
  other 
  rubbish. 
  

  

  ECONOMIC" 
  CONCLUSION. 
  

  

  As 
  a 
  general 
  result 
  of 
  these 
  investigations 
  we 
  certainly 
  Iiave 
  no 
  

   warrant 
  for 
  asserting 
  that 
  the 
  natural 
  agencies 
  effective 
  in 
  reducing 
  

   an 
  extraordinary 
  outbreak 
  of 
  the 
  chinch-bug 
  can 
  now 
  be 
  definitely 
  

   controlled 
  by 
  us 
  for 
  economic 
  ends. 
  So 
  far 
  as 
  ascertained, 
  the 
  final 
  

   causes 
  of 
  unusual 
  natural 
  destruction 
  of 
  this 
  insect 
  are 
  meteorologic- 
  

   al; 
  and 
  until 
  the 
  weather 
  of 
  the 
  season, 
  or 
  even 
  of 
  the 
  year, 
  can 
  be 
  

   foretold 
  with 
  approximate 
  definiteness 
  and 
  certainty, 
  we 
  cannot 
  fore- 
  

   cast 
  the 
  course 
  of 
  events 
  with 
  respect 
  to 
  injuries 
  by 
  the 
  chinch-bug. 
  

   Economic 
  entomology 
  must 
  wait 
  at 
  this 
  point 
  upon 
  meteorology. 
  

   Whether 
  the 
  fungi 
  of 
  contagious 
  disease 
  can 
  be 
  artificially 
  made 
  use 
  

   of 
  to 
  hasten 
  or 
  intensif}' 
  the 
  serviceable 
  effects 
  of 
  favorable 
  weather, 
  

   with 
  a 
  fretjuency 
  or 
  to 
  an 
  extent 
  to 
  make 
  this 
  procedure 
  economically 
  

   worth 
  while, 
  I 
  am 
  not 
  yet 
  prepared 
  to 
  say. 
  The 
  methods 
  of 
  dis- 
  

   tributing 
  these 
  fungi 
  in 
  the 
  field 
  have 
  hitherto 
  been 
  too 
  crude 
  

   to 
  make 
  their 
  substantial 
  failure 
  conclusive 
  as 
  to 
  the 
  whole 
  

   subject. 
  It 
  now 
  seems 
  quite 
  clear 
  that 
  they 
  can 
  at 
  best 
  be 
  used 
  

   only 
  as 
  secondary 
  to 
  other 
  measures, 
  esj^ecially 
  the 
  midsummer 
  

   measures 
  described 
  in 
  the 
  third 
  article 
  of 
  this 
  report. 
  If 
  applicable 
  

   at 
  all, 
  however, 
  they 
  can 
  be 
  brought 
  to 
  bear 
  at 
  a 
  point 
  now 
  entirely 
  

   defenceless; 
  and 
  it 
  seems 
  the 
  dvitj' 
  of 
  the 
  American 
  economic 
  entomolo- 
  

   gist 
  to 
  spare 
  no 
  iDains 
  to 
  investigate 
  to 
  a 
  final 
  and 
  indisputable 
  conclu- 
  

   sion 
  anything 
  which 
  promises 
  so 
  much 
  as 
  a 
  remote 
  possibility 
  that 
  the 
  

   chinch-bug 
  may 
  be 
  attacked 
  even 
  to 
  occasional 
  advantage 
  after 
  it 
  has 
  

   settled 
  itself 
  in 
  fields 
  of 
  small 
  arrain. 
  

  

  