﻿PROCEEDINGS 
  OF 
  THE 
  FOURTH 
  BKTOMOLOGICAL 
  MEETING 
  103 
  

  

  that 
  solution 
  and 
  given 
  to 
  two 
  dozen 
  caterpillars 
  to 
  eat 
  in 
  a 
  breeding 
  cage. 
  

   Next 
  morniig 
  on 
  examining 
  the 
  sprayed 
  crop, 
  no 
  dead 
  caterpillars 
  were 
  

   found 
  in 
  the 
  area 
  nor 
  did 
  caterpillars 
  appear 
  to 
  eat 
  the 
  leaves. 
  While 
  

   in 
  a 
  breeding 
  cage 
  out 
  of 
  two 
  dozen 
  worms, 
  about 
  1 
  to 
  2 
  caterpillars 
  

   were 
  found 
  dead, 
  while 
  the 
  rest 
  were 
  alive 
  and 
  the 
  leaves 
  were 
  found 
  

   slightly 
  nibbled 
  in 
  some 
  cases. 
  In 
  the 
  case 
  of 
  London 
  purple, 
  the 
  

   following 
  trial 
  was 
  made 
  on 
  a 
  small 
  scale 
  in 
  the 
  field 
  as 
  well 
  as 
  in 
  the 
  

   insectary 
  : 
  Half 
  to 
  once 
  ounce 
  of 
  London 
  purple 
  with 
  4 
  gallons 
  of 
  water 
  

   and 
  with 
  or 
  without 
  admixture 
  of 
  lime 
  were 
  tried. 
  The 
  effect 
  of 
  spraying 
  

   in 
  the 
  field 
  was 
  not 
  favourable, 
  as 
  no 
  dead 
  caterpillars 
  were 
  found 
  in 
  

   the 
  sprayed 
  area 
  nor 
  leaves 
  were 
  eaten 
  except 
  very 
  slightly 
  in 
  some 
  

   cases. 
  The 
  spray 
  had 
  also 
  some 
  effect 
  of 
  scorching 
  the 
  tips 
  of 
  leaves. 
  

   In 
  the 
  insectary 
  duplicate 
  series 
  of 
  one 
  dozen 
  caterpillars 
  were 
  taken 
  

   and 
  each 
  lot 
  was 
  given 
  Sann 
  leaves 
  to 
  eat, 
  dipped 
  in 
  the 
  following 
  

   strength 
  of 
  solution 
  : 
  — 
  

  

  London 
  purple 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  J 
  oz. 
  

  

  Quicklime 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  1 
  oz. 
  

  

  Water 
  . 
  .4 
  gallons. 
  

  

  Next 
  morning 
  on 
  examining 
  the 
  cages, 
  10 
  and 
  9 
  worms 
  were 
  found 
  dead 
  

   in 
  each 
  cage 
  respectively, 
  and 
  the 
  leaves 
  were 
  also 
  found 
  slightly 
  scorched 
  

   at 
  the 
  tips. 
  

  

  (e) 
  The 
  poison 
  baits 
  of 
  the 
  following 
  materials 
  were 
  found 
  rather 
  

   successful 
  : 
  — 
  

  

  lbs. 
  

   Wheat 
  bran 
  ......... 
  10 
  

  

  Jaggery 
  i 
  

  

  White 
  arsenic 
  ......... 
  i 
  

  

  ...... 
  4 
  

  

  Water 
  9 
  

  

  Small 
  baits 
  (one 
  teaspoonful 
  of 
  the 
  above 
  stuff) 
  were 
  put 
  at 
  short 
  

   intervals 
  at 
  the 
  foot 
  of 
  castor 
  and 
  other 
  crops. 
  The 
  caterpillars 
  were 
  

   noticed 
  to 
  eat 
  these 
  baits 
  readily 
  in 
  large 
  numbers 
  and 
  died 
  on 
  the 
  spot. 
  

   In 
  a 
  breeding 
  cage 
  the 
  above 
  baits 
  were 
  given 
  to 
  25 
  caterpillars. 
  Next 
  

   day, 
  19 
  of 
  them 
  died 
  and 
  the 
  3rd 
  day 
  the 
  remaining 
  ones 
  died. 
  But 
  

   these 
  baits 
  could 
  be 
  only 
  used 
  in 
  the 
  advanced 
  stage 
  of 
  the 
  caterpillars 
  

   while 
  they 
  are 
  actively 
  moving 
  on 
  the 
  ground. 
  The 
  other 
  point 
  which 
  

   is 
  to 
  be 
  marked 
  in 
  this 
  case 
  is 
  that 
  as 
  long 
  as 
  these 
  baits 
  remain 
  moist 
  in 
  

   the 
  field, 
  the 
  caterpillars 
  ate 
  them 
  ; 
  but 
  after 
  drying, 
  they 
  did 
  not 
  seem 
  

   to 
  touch 
  these. 
  

  

  The 
  last 
  controlling 
  measure 
  which 
  was 
  being 
  tried 
  for 
  this 
  pest 
  was 
  

   of 
  digging 
  and 
  collecting 
  from 
  suspected 
  places, 
  the 
  hibernating 
  pupae. 
  

   In 
  this 
  way 
  during 
  the 
  fair 
  season 
  of 
  1911 
  about 
  1,195 
  pupae 
  were 
  dug 
  out 
  

   from 
  the 
  soil 
  and 
  collected. 
  These 
  were 
  found 
  mostly 
  buried 
  along 
  the 
  

  

  H 
  2 
  

  

  