﻿36 
  

  

  they 
  move 
  up 
  and 
  down 
  tlie 
  line 
  in 
  search 
  of 
  passageway, 
  and 
  where 
  

   they 
  may 
  be 
  readily 
  killed. 
  This 
  method 
  is 
  a 
  somewhat 
  expensive 
  

   one. 
  however, 
  since 
  the 
  coal-tar. 
  exposed 
  to 
  the 
  heat 
  of 
  the 
  sun, 
  dries 
  

   out 
  rapidly, 
  and 
  in 
  bright 
  weather 
  must 
  be 
  renewed 
  two 
  or 
  three 
  

   times 
  a 
  day. 
  

  

  Another 
  measure 
  of 
  defense 
  is 
  based 
  upon 
  experiments 
  made 
  by 
  

   myself 
  in 
  lcS82,* 
  which 
  demonstrated 
  the 
  extreme 
  susceptibility 
  of 
  the 
  

   chinch-bug 
  to 
  destruction 
  by 
  dilute 
  kerosene-emulsion, 
  a 
  very 
  simple- 
  

   mechanical 
  mixture 
  of 
  kerosene 
  and 
  soap 
  suds 
  containing 
  from 
  three 
  

   to 
  five 
  per 
  cent, 
  of 
  the 
  former, 
  by 
  which 
  the 
  bugs 
  may 
  be 
  very 
  readily 
  

   killed, 
  as 
  they 
  concentrate 
  upon 
  the 
  outer 
  rows 
  of 
  corn 
  in 
  fields 
  

   which 
  they 
  are 
  entering 
  on 
  foot. 
  This 
  kerosene-emulsion 
  method 
  

   also 
  is 
  expensive 
  of 
  both 
  labor 
  and 
  time, 
  especially 
  if 
  depended 
  on 
  

   alone, 
  since 
  the 
  insecticide 
  must 
  be 
  applied 
  again 
  and 
  again, 
  as 
  the 
  

   corn 
  becomes 
  repeatedly 
  covered 
  by 
  the 
  invading 
  host, 
  and 
  the 
  outer 
  

   rows 
  will, 
  after 
  all, 
  commonly 
  be 
  sacrificed 
  to 
  the 
  bugs 
  even 
  if 
  

   promptly 
  and 
  thoroughly 
  treated. 
  

  

  A 
  combination 
  of 
  these 
  methods 
  described 
  in 
  full 
  and 
  earnestly 
  

   commended 
  in 
  my 
  last 
  entomological 
  report, 
  that 
  for 
  1893 
  and 
  1894,t 
  

   gives, 
  in 
  my 
  judgment, 
  the 
  most 
  successful 
  defence 
  against 
  the 
  

   chinch-bug 
  which 
  has 
  yet 
  been 
  devised. 
  It 
  must 
  be 
  understood, 
  

   however, 
  that 
  the 
  most 
  thoroughgoing 
  possible 
  application 
  of 
  this 
  

   combination 
  method 
  by 
  only 
  one 
  here 
  and 
  there 
  in 
  an 
  infested 
  re- 
  

   gion, 
  will 
  protect 
  a 
  field 
  from 
  invasion 
  oidy 
  temporarily. 
  If 
  the 
  in- 
  

   sects 
  are 
  allowed 
  to 
  escape 
  from 
  other 
  fields 
  without 
  interference 
  they 
  

   will 
  presently 
  acquire 
  wings 
  and 
  scatter 
  everywhere, 
  infesting 
  from 
  

   that 
  time 
  forward 
  all 
  fields 
  indiscriminately. 
  It 
  is 
  only 
  on 
  condition 
  

   that 
  the 
  bugs 
  are 
  (jeneraUy 
  arrested 
  and 
  destroyed 
  as 
  they 
  attempt 
  

   to 
  escape 
  from 
  fields 
  of 
  small 
  grain 
  that 
  the 
  full 
  and 
  permanent 
  bene- 
  

   fit 
  of 
  this 
  method 
  will 
  be 
  gained. 
  

  

  The 
  recommendations 
  in 
  the 
  above 
  report 
  were 
  based 
  on 
  experi- 
  

   ments 
  made 
  by 
  myself 
  and 
  my 
  assistants 
  on 
  the 
  Agricultural 
  Experi- 
  

   ment 
  Station 
  Farm 
  at 
  the 
  University 
  of 
  Illinois 
  in 
  July, 
  1894. 
  as 
  

   described 
  in 
  full 
  in 
  the 
  article 
  in 
  my 
  entomological 
  report 
  just 
  men- 
  

   tioned. 
  

  

  In 
  an 
  address 
  to 
  the 
  Illinois 
  Farmer's 
  Institute, 
  delivered 
  at 
  

   Springfield, 
  January 
  8, 
  1896,^' 
  this 
  description 
  and 
  recommendation 
  

   were 
  repeated 
  with 
  some 
  elaboration, 
  and 
  further 
  supported 
  there 
  by 
  

   a 
  brief 
  account 
  of 
  some 
  field 
  experiments 
  made 
  under 
  my 
  direction 
  

   in 
  I]rtingham 
  county, 
  Illinois, 
  by 
  an 
  assistant 
  of 
  this 
  ofiice 
  in 
  June. 
  

   1895. 
  Some 
  parts 
  of 
  this 
  method 
  were 
  also 
  used 
  with 
  great 
  success 
  

   by 
  a 
  considerable 
  number 
  of 
  farmers 
  near 
  Georgetown, 
  in 
  A^ermilion 
  

   county, 
  Illinois, 
  late 
  in 
  June, 
  1896, 
  as 
  described 
  in 
  the 
  weekly 
  ""Dan- 
  

   ville 
  News" 
  for 
  July 
  2 
  of 
  that 
  year. 
  

  

  Similar 
  and 
  equally 
  successful 
  work 
  was 
  done 
  in 
  Kansas 
  in 
  1896 
  

   by 
  an 
  interesting 
  modification 
  of 
  this 
  trap 
  and 
  barrier 
  method. 
  § 
  

  

  * 
  Twelfth 
  Rep. 
  Stute 
  Knt. 
  111., 
  iip. 
  59-0;^. 
  

  

  T 
  Pases 
  1-15. 
  

  

  : 
  Rep. 
  111. 
  Farmers' 
  Inst., 
  189G. 
  pp. 
  108-110. 
  

  

  2 
  5tb 
  Ann. 
  Rep. 
  Dir. 
  Exper. 
  Station, 
  Univ. 
  Kansas, 
  pp. 
  45-17. 
  

  

  