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  ROBERT 
  VEITCH. 
  

  

  leaves 
  of 
  the 
  rose 
  bushes 
  ; 
  and 
  in 
  many 
  districts 
  it 
  is 
  impossible 
  to 
  grow 
  roses 
  suc- 
  

   cessfully 
  unless 
  they 
  are 
  screened 
  every 
  evening 
  before 
  sundown. 
  

  

  Fig. 
  5. 
  Adoretus 
  versutus, 
  

   Har., 
  x 
  4. 
  

  

  The 
  beetle 
  feeds 
  on 
  the 
  leaves 
  of 
  sugar-cane, 
  guava, 
  acacias, 
  cacao 
  and 
  rose 
  bushes. 
  

   This 
  species 
  is 
  fortunately 
  of 
  slight 
  importance 
  in 
  the 
  cane-fields, 
  and 
  no 
  control 
  

   measures 
  are 
  required. 
  

  

  The 
  Introduced 
  Parasite 
  of 
  White 
  Grubs 
  (Scolia 
  manilae, 
  Ashm.). 
  

  

  While 
  on 
  a 
  recent 
  visit 
  to 
  Hawaii 
  the 
  writer 
  was 
  much 
  impressed 
  by 
  the 
  degree 
  

   of 
  success 
  obtained 
  in 
  the 
  introduction 
  of. 
  Scolia 
  manilae, 
  Ashm., 
  to 
  control 
  the 
  

   white 
  grubs 
  of 
  Anomala 
  orientalis, 
  Waterhouse. 
  This 
  pest 
  was 
  accidently 
  imported 
  

   from 
  Japan 
  in 
  quite 
  recent 
  years 
  and 
  is 
  now 
  firmly 
  established 
  on 
  two 
  plantations 
  

   on 
  the 
  island 
  of 
  Oahu, 
  where 
  it 
  is 
  seriously 
  reducing 
  the 
  cane 
  crops. 
  A 
  considerable 
  

   number 
  of 
  parasites 
  were 
  introduced 
  to 
  control 
  it, 
  and 
  of 
  these 
  the 
  Scolia 
  shows 
  most 
  

   promise 
  ; 
  at 
  the 
  end 
  of 
  1917 
  it 
  had 
  become 
  extremely 
  numerous, 
  and 
  showed 
  such 
  

   splendid 
  prospects 
  of 
  success 
  that 
  the 
  writer 
  determined 
  to 
  take 
  a 
  colony 
  back 
  to 
  

   Fiji, 
  in 
  the 
  hope 
  that 
  they 
  might 
  attack 
  the 
  Fijian 
  cane 
  grubs 
  and 
  rose-beetle 
  grubs. 
  

  

  The 
  officers 
  of 
  the 
  Hawaiian 
  Sugar 
  Planters 
  Association 
  gave 
  all 
  possible 
  assistance, 
  

   and 
  supplied 
  laboratory 
  accommodation 
  while 
  the 
  writer 
  was 
  breeding 
  the 
  colony, 
  and 
  

   also 
  much 
  helpful 
  advice 
  based 
  on 
  their 
  own 
  experience 
  in 
  handling 
  this 
  parasite. 
  

   The 
  colony 
  was 
  successfully 
  transported 
  to 
  Fiji, 
  and 
  six 
  hundred 
  fertilised 
  females 
  and 
  

   over 
  two 
  hundred 
  males 
  were 
  liberated 
  in 
  an 
  area 
  that 
  is 
  always 
  badly 
  infested 
  with 
  

   grubs. 
  It 
  is 
  still 
  too 
  early 
  to 
  say 
  whether 
  or 
  not 
  success 
  has 
  been 
  attained, 
  but 
  the 
  

   laboratory 
  trials 
  showed 
  promising 
  results, 
  for 
  the 
  parasite 
  attacked 
  the 
  grubs 
  of 
  

   R. 
  vestita 
  and 
  A. 
  versutus 
  and 
  laid 
  eggs 
  on 
  them 
  ; 
  adult 
  parasites 
  were 
  subsequently 
  

   reared 
  from 
  some 
  of 
  these 
  eggs. 
  A 
  distinctly 
  unfavourable 
  factor 
  was 
  introduced 
  a 
  

   few 
  weeks 
  after 
  the 
  parasites 
  were 
  liberated, 
  for 
  a 
  heavy 
  flood 
  occurred, 
  resulting 
  

   in 
  a 
  large 
  portion 
  of 
  the 
  grub-infested 
  area 
  being 
  under 
  water 
  for 
  a 
  few 
  hours, 
  and 
  if 
  

   larvae 
  and 
  pupae 
  of 
  the 
  parasite 
  were 
  present 
  in 
  the 
  soil, 
  it 
  is 
  almost 
  certain 
  that 
  

   a 
  considerable 
  number 
  of 
  them 
  perished. 
  

  

  