﻿PROCEEDINGS 
  OF 
  THE 
  FOURTH 
  ENTOMOLOGICAL 
  MEETING 
  77 
  

  

  instar 
  prior 
  to 
  pupation, 
  and 
  the 
  idea 
  that 
  the 
  larval 
  life 
  is 
  longer 
  at 
  this 
  

   time 
  of 
  the 
  year 
  is 
  borne 
  out 
  by 
  the 
  fact 
  that 
  the 
  percentage 
  of 
  population 
  

   on 
  the 
  whole 
  shows 
  little 
  or 
  no 
  increase 
  until 
  towards 
  the 
  end 
  of 
  the 
  season- 
  

   picking, 
  whereas 
  after 
  that 
  period 
  the 
  rise 
  is 
  steadily 
  maintained, 
  allow- 
  

   ance 
  being 
  made 
  for 
  experimental 
  error. 
  For 
  example, 
  the 
  sudden 
  

   drop 
  shown 
  in 
  the 
  curve 
  in 
  the 
  week 
  ending 
  12th 
  June 
  1920 
  was 
  probably 
  

   due 
  to 
  an 
  insufficient 
  number 
  of 
  bolls 
  being 
  examined. 
  However, 
  this 
  

   may 
  not 
  be 
  the 
  whole 
  reason, 
  for 
  Pollachi 
  boll 
  examinations 
  show 
  a 
  

   similar 
  fall 
  about 
  the 
  same 
  period. 
  

  

  The 
  season-picking 
  ends 
  in 
  the 
  last 
  week 
  in 
  April, 
  the 
  fresh 
  flush 
  

   of 
  bolls 
  after 
  this, 
  the 
  bolls, 
  that 
  is, 
  which 
  will 
  produce 
  the 
  " 
  Kar 
  " 
  

   picking, 
  ripen 
  rather 
  more 
  quickly 
  and 
  it 
  is 
  possible 
  that 
  the 
  high 
  winds 
  

   prevailing 
  from 
  June 
  onwards 
  help 
  to 
  dry 
  the 
  bolls 
  and 
  consequently 
  

   to 
  shorten 
  the 
  larval 
  period 
  of 
  the 
  boll-worms 
  so 
  that 
  generations 
  

   succeed 
  one 
  another 
  more 
  rapidly. 
  

  

  In 
  this 
  connection 
  it 
  may 
  be 
  said 
  that 
  the 
  very 
  few 
  cases 
  of 
  prolonged 
  

   larval 
  life 
  or 
  anything 
  approaching 
  long-cycle 
  larvae 
  occurred 
  in 
  the 
  

   season- 
  picking 
  and 
  not 
  in 
  the 
  " 
  Kar 
  " 
  picking. 
  As 
  already 
  stated, 
  

   however, 
  in 
  South 
  India 
  the 
  increase 
  in 
  number 
  pf 
  bolls 
  attacked 
  during 
  

   the 
  season 
  is 
  not 
  complicated 
  by 
  moths 
  produced 
  from 
  long-cycle 
  larvae 
  

   of 
  the 
  year 
  before. 
  Nearly 
  all 
  bolls 
  examined 
  towards 
  the 
  middle 
  of 
  

   July 
  from 
  all 
  districts 
  showed 
  a 
  proportion 
  of 
  full-grown 
  boll- 
  worms, 
  

   indicating 
  that 
  in 
  the 
  last 
  week 
  of 
  July 
  or 
  the 
  first 
  week 
  of 
  August 
  a 
  

   big 
  crop 
  of 
  moths 
  and 
  consequent 
  number 
  of 
  boll-worms 
  was 
  to 
  be 
  

   expected. 
  This 
  would 
  account 
  for 
  the 
  very 
  great 
  measure 
  of 
  success 
  

   attained 
  in 
  the 
  lapplication 
  of 
  the 
  Pest 
  Act. 
  The 
  amount 
  of 
  damaged 
  

   crop 
  was 
  very 
  small 
  and 
  Cambodia 
  cotton 
  from 
  Coimbatore 
  realised 
  

   Ks. 
  200 
  per 
  Kandy 
  above 
  Broach, 
  which 
  in 
  other 
  years 
  equalled 
  or 
  

   excelled 
  Cambodia. 
  

  

  Tables 
  are 
  given 
  showing 
  the 
  relative 
  increase 
  of 
  Earias 
  {Earias 
  here 
  

   includes 
  both 
  E. 
  fabia 
  and 
  E. 
  insulana) 
  during 
  the 
  season. 
  In 
  October 
  

   and 
  November 
  1919 
  Earias 
  did 
  a 
  great 
  deal 
  of 
  damage 
  in 
  the 
  Central 
  

   Farm 
  to 
  the 
  top-shoots 
  of 
  the 
  young 
  cotton 
  plants. 
  It 
  was 
  equally 
  

   prevalent 
  out 
  in 
  the 
  District 
  but 
  did 
  not 
  appear 
  to 
  have 
  caused 
  so 
  much 
  

   damage. 
  Some 
  raiyats 
  even 
  said 
  it 
  was 
  a 
  blessing 
  in 
  disguise 
  as 
  it 
  topped 
  

   the 
  plants 
  and 
  made 
  them 
  branch 
  and 
  produce 
  more 
  bolls, 
  an 
  opinion 
  

   which 
  the 
  condition 
  of 
  their 
  crop 
  justified. 
  (Plate 
  XV, 
  fig. 
  2.) 
  

  

  It 
  will 
  be 
  seen 
  that 
  towards 
  the 
  end 
  of 
  the 
  year 
  Earias 
  increases 
  

   in 
  numbers 
  rapidly 
  and 
  maintains 
  that 
  ascendency 
  until 
  the 
  first 
  flowering 
  

   season 
  is 
  over, 
  after 
  which 
  time 
  the 
  percentage 
  falls 
  again. 
  Towards 
  

   the 
  end 
  of 
  the 
  " 
  Kar 
  " 
  season 
  large 
  numbers 
  of 
  Earias 
  larvae 
  were 
  found. 
  

  

  