﻿PROCEEDINGS 
  OF 
  THE 
  FOUETH 
  ENTOMOLOGICAL 
  MEETING 
  135 
  

  

  In 
  Burma, 
  as 
  I 
  have 
  already 
  said, 
  I 
  have 
  not 
  yet 
  come 
  across 
  Chilo 
  

   simplex. 
  There 
  the 
  principal 
  borer 
  seems 
  to 
  be 
  Schcenohius 
  bipunctifer. 
  

  

  Damage 
  to 
  sugarcane. 
  

  

  A 
  good 
  deal 
  has 
  been 
  said 
  in 
  this 
  respect 
  in 
  the 
  first 
  paper. 
  The 
  

   work 
  was 
  continued 
  on 
  the 
  same 
  lines 
  after 
  that 
  paper 
  was 
  written 
  

   and 
  also 
  a 
  visit 
  was 
  paid 
  to 
  several 
  places 
  in 
  Bengal, 
  the 
  cane-breeding 
  

   station 
  at 
  Coimbatore, 
  to 
  Hebbal 
  Farm 
  in 
  Mysore, 
  to 
  Manjri 
  Farm 
  

   in 
  Bombay 
  and 
  to 
  Nagpur 
  to 
  get 
  a 
  general 
  idea 
  of 
  borer 
  pests 
  in 
  these 
  

   places. 
  The 
  occurrence 
  of 
  the 
  beetle 
  pests 
  in 
  the 
  Kamrup 
  Farm 
  also 
  

   gave 
  an 
  opportunity 
  of 
  gauging 
  the 
  external 
  agents 
  of 
  damage, 
  especially 
  

   the 
  Dynastine 
  beetles, 
  at 
  their 
  real 
  capability 
  of 
  damage. 
  The 
  results 
  

   of 
  the 
  further 
  experimental 
  work 
  at 
  Pusa 
  and 
  observations 
  at 
  the 
  places 
  

   mentioned 
  are 
  summarized 
  below 
  : 
  — 
  

  

  The 
  incidence 
  of 
  attack 
  on 
  sugarcane 
  by 
  the 
  insects 
  dealt 
  with 
  in 
  

   these 
  papers 
  is 
  correlated 
  with 
  climatic 
  conditions. 
  Favourable 
  climatic 
  

   conditions, 
  enabling 
  the 
  crop 
  to 
  grow 
  rapidly, 
  have 
  a 
  great 
  effect 
  in 
  

   controlling 
  the 
  activities 
  of 
  the 
  pests, 
  the 
  crop 
  in 
  such 
  cases 
  easily 
  out- 
  

   growing 
  their 
  attack. 
  But 
  with 
  unfavourable 
  climatic 
  conditions, 
  

   especially 
  drought 
  and 
  want 
  of 
  moisture 
  in 
  the 
  soil 
  (especially 
  in 
  places 
  

   like 
  Pusa 
  and 
  many 
  places 
  in 
  Upper 
  India 
  where 
  no 
  irrigation 
  is 
  given 
  

   to 
  the 
  crop) 
  the 
  insects 
  get 
  the 
  upper 
  hand, 
  and 
  owing 
  to 
  want 
  of 
  growth 
  

   and 
  tillering 
  on 
  the 
  part 
  of 
  the 
  plants, 
  the 
  loss 
  caused 
  by 
  their 
  attack 
  

   is 
  not 
  compensated 
  for, 
  the 
  result 
  being 
  that 
  the 
  percentage 
  of 
  attack 
  

   becomes 
  very 
  high. 
  

  

  At 
  Pusa 
  the 
  principal 
  damage 
  to 
  sugarcane 
  is 
  caused 
  in 
  the 
  early 
  

   stages 
  of 
  its 
  growth 
  in 
  April, 
  May 
  and 
  June 
  v/hen 
  the 
  climatic 
  conditions 
  

   are 
  characterized 
  by 
  high 
  temperature, 
  low 
  humidity 
  (see 
  the 
  chart 
  

   given 
  in 
  the 
  first 
  paper 
  opposite 
  page 
  370) 
  and 
  absence 
  or 
  scantiness 
  

   of 
  rainfall. 
  In 
  April 
  1920 
  the 
  damage 
  to 
  some 
  of 
  the 
  thick 
  canes 
  at 
  

   Pusa 
  was 
  as 
  high 
  as 
  10 
  per 
  cent, 
  whilst 
  at 
  Coimbatore 
  and 
  Hebbal 
  in 
  

   Mysore, 
  similar 
  canes 
  exhibited 
  hardly 
  any 
  damage. 
  The 
  canes 
  at 
  

   these 
  places, 
  although 
  planted 
  about 
  the 
  same 
  time 
  as 
  these 
  at 
  Pusa, 
  

   were 
  far 
  more 
  advanced 
  in 
  growth 
  than 
  those 
  at 
  Pusa 
  on 
  account 
  of 
  

   the 
  more 
  favourable 
  climatic 
  conditions 
  prevailing 
  at 
  these 
  places. 
  

   The 
  canes 
  at 
  Manjri, 
  planted 
  earlier 
  and 
  grown 
  under 
  irrigation 
  were 
  

   certainly 
  not 
  as 
  good 
  as 
  the 
  Coimbatore 
  and 
  Hebbal 
  canes 
  as 
  regards 
  

   growth 
  and 
  infestation 
  by 
  borers. 
  This 
  again 
  is 
  ascribable 
  to 
  the 
  more 
  

   unfavourable 
  climatic 
  conditions 
  at 
  Manjri 
  than 
  at 
  Coimbatore 
  and 
  

   Hebbal. 
  

  

  The 
  correlation 
  of 
  damage 
  and 
  climatic 
  conditions 
  holds 
  good 
  in 
  

   all 
  varieties 
  of 
  cane, 
  thick 
  as 
  well 
  as 
  thin, 
  but 
  thin 
  ones 
  show 
  a 
  greater 
  

  

  k2 
  

  

  