﻿EXPERIENCE 
  WITH 
  THE 
  SPRING 
  CANKER-WORM. 
  [85] 
  

  

  of 
  wliicli 
  could 
  be 
  seen 
  readily 
  with 
  an 
  ordinary 
  lens. 
  The 
  eggs 
  appear 
  

   to 
  consist 
  of 
  two 
  colors, 
  dark 
  and 
  light, 
  the 
  light 
  predominatiDg 
  in 
  the 
  

   proportion 
  in 
  which 
  we 
  find 
  the 
  males 
  predominating 
  in 
  the 
  perfect 
  in- 
  

   sect; 
  this, 
  evidently, 
  accounting 
  for 
  the 
  variations 
  in 
  the 
  color 
  of 
  the 
  

   worms 
  while 
  preying 
  on 
  the 
  foliage. 
  Of 
  these 
  specimens 
  I 
  have 
  pre- 
  

   served 
  a 
  number 
  as 
  above 
  prepared 
  for 
  future 
  reference. 
  

  

  Considering, 
  therefore, 
  the 
  severe 
  climatic 
  changes 
  in 
  this 
  region, 
  

   together 
  with 
  the 
  long 
  continued 
  gales 
  of 
  drying 
  winds 
  from 
  the 
  west 
  

   and 
  southwest 
  during 
  the 
  early 
  spring 
  months, 
  which 
  calls 
  forth 
  every 
  

   exertion 
  to 
  keep 
  the 
  plastic 
  bands 
  in 
  proper 
  condition, 
  the 
  tenacity 
  

   and 
  persistence 
  of 
  these 
  insects, 
  and 
  their 
  endurance 
  of 
  the 
  extreme 
  

   changes 
  of 
  temperature, 
  the 
  liability 
  of 
  the 
  adhesive 
  coatings 
  to 
  become 
  

   bridged 
  over 
  by 
  floating 
  matter 
  carried 
  along 
  by 
  the 
  wiuds, 
  we 
  cannot 
  

   fail 
  to 
  conclude 
  that 
  the 
  most 
  practical 
  means 
  of 
  relief 
  lies 
  in 
  the 
  de- 
  

   struction 
  of 
  the 
  grub 
  early 
  in 
  spring 
  after 
  hatching 
  out, 
  and 
  that 
  the 
  

   work 
  should 
  be 
  prompt 
  to 
  be 
  pfiective. 
  

  

  Permit 
  me 
  to 
  call 
  attention 
  to 
  the 
  use 
  of 
  pure 
  arsenite 
  of 
  copper, 
  as 
  

   imperative 
  to 
  success. 
  I 
  use 
  the 
  term 
  arsenite 
  of 
  copper 
  in 
  preference^ 
  

   from 
  the 
  fact 
  that 
  long 
  experience 
  in 
  the 
  use 
  of 
  this 
  poison 
  in 
  manufact- 
  

   uring 
  in 
  the 
  East 
  enables 
  me 
  to 
  assert 
  that 
  the 
  ordinary 
  Paris 
  green 
  sold 
  

   in 
  our 
  drug 
  stores 
  for 
  agricultural 
  purposes 
  is 
  largely 
  composed 
  of 
  sul- 
  

   phate 
  of 
  baryta, 
  the 
  specific 
  gravity 
  of 
  which 
  misleads 
  those 
  unaccustomed 
  

   to 
  its 
  u'se, 
  and 
  is 
  therefore 
  not 
  arsenite 
  of 
  copper, 
  but 
  an 
  adulteration 
  — 
  

   the 
  greatly 
  increased 
  demand 
  for 
  which, 
  since 
  the 
  advent 
  of 
  the 
  Color- 
  

   ado 
  beetle, 
  by 
  the 
  agriculturist, 
  increased 
  the 
  incentive 
  to 
  adulteration 
  

   by 
  unscrupulous 
  German 
  Jews, 
  who 
  are 
  the 
  principal 
  manipulators 
  in 
  

   this 
  country. 
  Upon 
  this 
  may 
  be 
  laid 
  the 
  causes 
  of 
  failure 
  of 
  many 
  

   to 
  accomplish 
  the 
  desired 
  end, 
  though 
  particular 
  to 
  follow 
  the 
  details 
  

   of 
  practice. 
  

  

  Again, 
  the 
  use 
  of 
  a 
  good 
  force 
  pump 
  is 
  requisite. 
  There 
  are 
  many 
  

   such 
  pumps 
  to 
  be 
  procured 
  with 
  air 
  chambers 
  mounted 
  on 
  wheels 
  with 
  

   the 
  capacity 
  of 
  a 
  barrel, 
  which 
  with 
  some 
  twenty-five 
  feet 
  of 
  hose-pipe, 
  

   nozzle, 
  and 
  sprinkler 
  cost 
  about 
  $15. 
  A 
  number 
  of 
  our 
  neighbors 
  have 
  

   procured 
  them 
  since 
  our 
  trials, 
  and 
  where 
  one 
  found 
  the 
  burden 
  of 
  ex- 
  

   pense 
  too 
  great, 
  two 
  or 
  more 
  clubbed 
  together 
  in 
  the 
  purchase. 
  

  

  It 
  is 
  the 
  general 
  opinion, 
  if 
  I 
  mistake 
  not, 
  that 
  the 
  canker 
  worm 
  is 
  

   local, 
  in 
  consequence 
  of 
  the 
  fact 
  that 
  the 
  female 
  is 
  wingless, 
  and 
  there- 
  

   fore 
  cannot 
  spread. 
  This 
  I 
  find 
  is 
  an 
  error, 
  more 
  particularly 
  in 
  this 
  

   locality 
  so 
  lavishly 
  favored 
  with 
  high 
  winds. 
  Caught 
  up 
  by 
  the 
  gales, 
  

   while 
  suspended 
  upon 
  their 
  gossamer 
  web, 
  I 
  have 
  seen 
  multitudes 
  car- 
  

   ried 
  far 
  away, 
  flying 
  thus 
  supported 
  for 
  long 
  distances, 
  reminding 
  one 
  of 
  

   the 
  gossamer 
  spiders 
  which 
  float 
  along 
  on 
  a 
  moderate 
  breeze; 
  using 
  the 
  

   same 
  means 
  of 
  transit 
  comparatively. 
  That 
  they 
  have 
  spread 
  over 
  a 
  

   large 
  portion 
  of 
  the 
  Northwest 
  within 
  a 
  few 
  years 
  the 
  blackened 
  and 
  

   seared 
  foliage 
  of 
  our 
  orchards 
  tell 
  — 
  a 
  fearful 
  truth. 
  And 
  it 
  is 
  the 
  settled 
  

   conviction 
  of 
  all 
  our 
  orchardists 
  and 
  farmers 
  that 
  unless 
  the 
  proper 
  

   means 
  are 
  used 
  to 
  destroy 
  these 
  pests, 
  and 
  before 
  much 
  time 
  has 
  passed 
  

   away, 
  that 
  a 
  crop 
  of 
  apples 
  will 
  be 
  a 
  thing 
  of 
  the 
  past, 
  and 
  our 
  orchards 
  

   will 
  give 
  place 
  to 
  more 
  remunerative 
  purposes. 
  At 
  the 
  ijresent 
  rate 
  of 
  

   destruction 
  by 
  the 
  canker 
  worm 
  and 
  scale 
  there 
  is 
  but 
  a 
  step 
  from 
  the 
  

   living 
  to 
  the 
  dead. 
  

  

  Prof. 
  C. 
  y. 
  KiLEY. 
  

  

  