﻿190 
  REPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  Le 
  Baron's 
  trap. 
  — 
  Br. 
  William 
  Le 
  Baron 
  found, 
  in 
  1871, 
  that 
  by 
  

   attaching 
  a 
  band 
  of 
  polished 
  tin 
  closely 
  around 
  the 
  trunk 
  of 
  the 
  tree, 
  

   so 
  that 
  the 
  female 
  moths 
  could 
  not 
  ascend 
  the 
  tree 
  withoulf 
  crossing 
  this 
  

   band, 
  the 
  moths 
  were 
  to 
  a 
  large 
  extent 
  checked 
  in 
  their 
  ascent, 
  not 
  from 
  

   inability 
  to 
  cross 
  the 
  band, 
  but 
  from 
  being 
  baffled 
  in 
  their 
  instincts. 
  

   This 
  preventive, 
  however, 
  was 
  not 
  thorough; 
  but 
  by 
  fastening 
  the 
  tin 
  

   band 
  over 
  a 
  ring 
  of 
  ro])e 
  with 
  which 
  the 
  trunk 
  of 
  the 
  tree 
  Avas 
  encir- 
  

   cled, 
  so 
  that 
  both 
  the 
  upper 
  and 
  lower 
  edges 
  of 
  the 
  band 
  might 
  stand 
  

   out 
  free 
  from 
  the 
  trunk, 
  the 
  moths 
  were 
  completely 
  baffled, 
  and, 
  if 
  they 
  

   reached 
  the 
  upper 
  edge 
  of 
  the 
  band, 
  would 
  not 
  descend 
  inside 
  so 
  as 
  to 
  

   reach 
  the 
  trunk 
  again. 
  

  

  Mr. 
  E. 
  M. 
  Milliken 
  experimented 
  with 
  this 
  tin 
  and 
  rope 
  trap 
  in 
  1873 
  

   on 
  a 
  small 
  orchard 
  of 
  39 
  trees, 
  and 
  gave 
  the 
  following, 
  in 
  the 
  Frairie 
  

   Farmer^ 
  as 
  his 
  experience 
  : 
  

  

  In 
  1873 
  I 
  applied 
  the 
  rope 
  and 
  tin 
  in 
  tliis 
  way: 
  I 
  nailed 
  a 
  rope 
  tight 
  around 
  the 
  

   tree, 
  took 
  tin 
  five 
  inches 
  wide 
  and 
  nailed 
  it 
  on 
  the 
  rope, 
  half 
  the 
  tin 
  above 
  the 
  rope 
  

   and 
  half 
  below 
  it. 
  I 
  put 
  it 
  on 
  with 
  three-penny 
  nails. 
  After 
  I 
  put 
  the 
  tin 
  on, 
  I 
  took 
  

   lime 
  and 
  sand 
  and 
  made 
  a 
  thin 
  mortar 
  and 
  poured 
  it 
  in 
  on 
  the 
  rope 
  to 
  stop 
  any 
  holes 
  

   that 
  might 
  be 
  left. 
  When 
  the 
  tin 
  gets 
  full 
  below, 
  they 
  will 
  get 
  on 
  the 
  tin, 
  but 
  won't 
  

   go 
  down 
  above 
  to 
  get 
  on 
  the 
  tree. 
  I 
  saw 
  them 
  on 
  the 
  tin 
  (that 
  is, 
  the 
  moth), 
  but 
  

   did 
  not 
  see 
  one 
  above 
  it. 
  I 
  have 
  known 
  some 
  to 
  try 
  it 
  on 
  a 
  few 
  trees, 
  and 
  condemn 
  

   it 
  because 
  it 
  was 
  not 
  successful. 
  If 
  the 
  trees 
  don't 
  stand 
  more 
  than 
  two 
  rods 
  apart 
  the 
  

   wind 
  will 
  carry 
  plenty 
  of 
  the 
  worms 
  from 
  oue 
  tree 
  to 
  another 
  to 
  strip 
  it. 
  My 
  trees 
  

   stand 
  fully 
  two 
  rods 
  apart, 
  and 
  in 
  1872 
  they 
  were 
  one 
  complete 
  mass 
  of 
  webs, 
  made 
  

   by 
  the 
  wind 
  carrying 
  the 
  worms 
  from 
  one 
  tree 
  to 
  another. 
  My 
  trees 
  measure 
  from 
  

   two 
  to 
  four 
  feet 
  in 
  circumference, 
  and 
  it 
  did 
  not 
  cost 
  me 
  twelve 
  cents 
  for 
  each 
  tree. 
  

  

  "If 
  the 
  trunk 
  is 
  kept 
  clean 
  below 
  the 
  trap, 
  and 
  an 
  application 
  of 
  

   kerosene 
  made 
  to 
  the 
  eggs 
  from 
  time 
  to 
  time, 
  there 
  will 
  be 
  no 
  neces- 
  

   sity 
  for 
  plastering 
  the 
  upper 
  part 
  of 
  the 
  trap. 
  It 
  is 
  more 
  difficult 
  to 
  

   check 
  the 
  ascent 
  of 
  the 
  young 
  worms 
  than 
  their 
  parents, 
  because 
  of 
  

   their 
  minute 
  size 
  and 
  power 
  to 
  travel 
  over 
  the 
  smoothest 
  surfaces. 
  

   The 
  best 
  way 
  to 
  do 
  it 
  is 
  by 
  greasing 
  the 
  eggs 
  and 
  thus 
  preventing 
  their 
  

   hatching. 
  If 
  the 
  tin 
  is 
  smeared 
  with 
  a 
  mixture 
  of 
  equal 
  i^arts 
  of 
  kero- 
  

   sene 
  and 
  castor 
  oil, 
  it 
  will 
  prove 
  still 
  more 
  effectual." 
  

  

  Dr. 
  Le 
  Baron 
  says 
  further 
  :^^^ 
  

  

  There 
  is 
  a 
  period 
  of 
  about 
  three 
  weeks 
  between 
  the 
  time 
  of 
  the 
  laying 
  and 
  that 
  of 
  

   the 
  hatching 
  of 
  the 
  eggs, 
  when 
  the 
  whole 
  generation 
  of 
  the 
  spring 
  Canker 
  Worms 
  is 
  

   safely 
  ensconced 
  under 
  the 
  scales 
  of 
  bark 
  on 
  the 
  trunk 
  and 
  larger 
  branches; 
  no 
  matter 
  

   whether 
  they 
  are 
  deposited 
  in 
  the 
  fall, 
  the 
  winter, 
  _or 
  the 
  spring, 
  they 
  are 
  all 
  there 
  

   now, 
  and 
  just 
  to 
  the 
  extent 
  that 
  we 
  can 
  destroy 
  these 
  eggs 
  we 
  shall 
  exterminate 
  the 
  

   Canker 
  Worms. 
  It 
  follows, 
  therefore, 
  that 
  if 
  w^e 
  scrape 
  off 
  the 
  scales 
  and 
  burn 
  them 
  

   we 
  shall 
  prevent 
  the 
  hatching 
  of 
  a 
  considerable 
  proportion 
  of 
  the 
  worms. 
  Yet 
  many 
  

   will 
  remain 
  ; 
  probably 
  the 
  greater 
  jjart 
  of 
  them 
  will 
  adhere 
  to 
  small 
  scales, 
  which 
  our 
  

   scraping 
  will 
  not 
  remove. 
  But 
  by 
  removiog 
  the 
  larger 
  scales 
  the 
  remainder 
  will 
  be 
  

   more 
  or 
  less 
  exposed, 
  and 
  the 
  application 
  of 
  any 
  wash 
  that 
  we 
  may 
  desire 
  to 
  make 
  

   will 
  be 
  rendered 
  easier 
  and 
  more 
  efficacious. 
  Having 
  scraped 
  off 
  the 
  larger 
  scales, 
  

   therefore, 
  the 
  next 
  thing 
  will 
  be 
  to 
  apply 
  some 
  substance 
  which 
  will 
  destroy 
  the 
  eggs 
  

   without 
  injuring 
  the 
  tree. 
  Is 
  any 
  such 
  substance 
  known 
  ? 
  We 
  have 
  apjdied 
  soft 
  

  

  »fi 
  Prairie 
  Farmer, 
  March, 
  1873 
  or 
  1874. 
  

  

  