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  or 
  brushing 
  the 
  plants 
  attacked 
  by 
  them, 
  and 
  once 
  expelled 
  they 
  return 
  

   slowly 
  or 
  not 
  at 
  all. 
  The 
  very 
  common 
  striped 
  species 
  is 
  usually 
  quite 
  

   easily 
  expelled 
  in 
  this 
  way, 
  but 
  the 
  margined 
  blister-beetle 
  is 
  not 
  so 
  

   easily 
  driven. 
  The 
  injuries 
  of 
  these 
  beetles 
  should 
  be 
  arrested, 
  if 
  prac- 
  

   ticable, 
  without 
  destroying 
  them, 
  as 
  in 
  the 
  larval 
  stage 
  they 
  are 
  ex- 
  

   tremely 
  useful 
  enemies 
  of 
  grasshoppers. 
  Indeed 
  they 
  are 
  commonly 
  

   numerous 
  enough 
  to 
  be 
  injurious 
  only 
  when 
  grasshoppers 
  are 
  themselves 
  

   abundant 
  or 
  have 
  been 
  so 
  very 
  recently. 
  The 
  blister-beetles 
  are 
  also 
  

   subject 
  to 
  poisoning 
  by 
  Paris-green 
  sprays. 
  Mechanical 
  measures 
  for 
  

   the 
  collection 
  and 
  destruction 
  of 
  leaf-eating 
  insects 
  are 
  sometimes 
  

   resorted 
  to 
  in 
  Europe, 
  but 
  have 
  not 
  as 
  yet 
  become 
  necessary 
  in 
  this 
  

   country. 
  

  

  These 
  general 
  suggestions 
  of 
  insecticide 
  measures 
  must 
  suffice 
  for 
  

   this 
  preliminary 
  report, 
  since 
  few 
  exact 
  experiments 
  have 
  been 
  made 
  in 
  

   this 
  country 
  with 
  insecticide 
  applications 
  to 
  the 
  sugar 
  beet, 
  and 
  there 
  is 
  

   very 
  little 
  expert 
  testimony 
  upon 
  this 
  subject 
  to 
  draw 
  upon. 
  

  

  CLASSIFICATION 
  OF 
  THE 
  SUGAR-BEET 
  INSECTS. 
  

   As 
  the 
  beet 
  grower 
  usually 
  cannot 
  become 
  an 
  entomologist, 
  and 
  

   probably 
  does 
  not 
  wish 
  to 
  become 
  one 
  if 
  he 
  could, 
  it 
  is 
  important 
  that 
  

   he 
  should 
  have 
  a 
  means 
  of 
  identifying 
  and 
  recognizing 
  insect 
  injuries 
  

   to 
  his 
  beets 
  without 
  being 
  compelled, 
  more 
  than 
  is 
  really 
  necessary, 
  to 
  

   make 
  himself 
  acquainted 
  with 
  the 
  names 
  and 
  habits 
  of 
  the 
  insects 
  con- 
  

   cerned. 
  This 
  end 
  he 
  may 
  accomplish 
  in 
  great 
  measure 
  by 
  a 
  careful 
  

   observation 
  of 
  the 
  injuries 
  to 
  the 
  plants 
  themselves, 
  by 
  which 
  means 
  he 
  

   may 
  readily 
  limit 
  his 
  inquiries 
  to 
  a 
  comparatively 
  small 
  number 
  of 
  in- 
  

   sect 
  species 
  capable 
  of 
  doing 
  the 
  kind 
  of 
  injury 
  under 
  observation. 
  

   Thus, 
  if 
  he 
  finds 
  the 
  underground 
  part 
  of 
  the 
  beet 
  eaten 
  into 
  or 
  gnawed 
  

   away 
  he 
  of 
  course 
  excludes 
  at 
  once 
  from 
  consideration 
  those 
  species 
  

   which 
  infest 
  the 
  plant 
  only 
  above 
  ground, 
  and 
  also 
  those 
  which 
  infest 
  it 
  

   under 
  ground 
  but 
  which 
  merely 
  pierce 
  it 
  with 
  their 
  beaks 
  and 
  suck 
  out 
  

   its 
  juicesj 
  and 
  similarly, 
  if 
  he 
  finds 
  the 
  leaves 
  ragged 
  and 
  evidently 
  

   being 
  eaten 
  away 
  by 
  biting 
  insects, 
  of 
  whatever 
  kind, 
  his 
  search 
  for 
  a 
  

   remedy 
  is 
  greatly 
  simplified. 
  He 
  needs 
  only 
  to 
  see 
  whether 
  the 
  injury 
  

   is 
  being 
  done 
  by 
  blister-beetles, 
  which 
  should 
  be 
  driven 
  from 
  the 
  field, 
  

   or 
  by 
  cutworms 
  or 
  grasshoppers, 
  which 
  may 
  best 
  be 
  destroyed 
  by 
  poi- 
  

   soned 
  baits. 
  If 
  he 
  finds 
  neither 
  of 
  these, 
  he 
  may 
  proceed 
  at 
  once 
  to 
  

   spray 
  his 
  plants 
  with 
  an 
  arsenical 
  insecticide, 
  knowing 
  that 
  whatever 
  

   the 
  insect 
  agent 
  of 
  the 
  injury 
  may 
  be 
  this 
  will 
  be 
  the 
  proper 
  method 
  of 
  

   attack. 
  In 
  this 
  paper 
  the 
  insects 
  likely 
  to 
  do 
  any 
  single 
  kind 
  of 
  injury 
  

   have 
  been 
  brought 
  together 
  for 
  discussion 
  in 
  an 
  economic 
  group 
  the 
  

   members 
  of 
  which 
  are 
  few 
  in 
  number 
  and 
  readily 
  distinguishable 
  from 
  

   each 
  other, 
  and 
  the 
  inquirer 
  is 
  thus 
  brought 
  by 
  the 
  shortest 
  and 
  easiest 
  

   route 
  to 
  the 
  sources 
  of 
  the 
  practical 
  information 
  which 
  he 
  desires. 
  

  

  