﻿INSECTS 
  IN 
  SUGAR-CANE 
  PLANTATIONS 
  IN 
  FIJI. 
  

  

  29 
  

  

  eggs 
  of 
  the 
  two 
  species, 
  but 
  the 
  well 
  grown 
  grubs 
  are 
  not 
  difficult 
  to 
  separate, 
  as 
  

   that 
  of 
  R. 
  subnitida 
  is 
  more 
  hairy 
  and 
  has 
  longer 
  legs 
  than 
  the 
  grub 
  of 
  R. 
  vestita. 
  

  

  The 
  egg-laying 
  records 
  of 
  females 
  kept 
  in 
  captivity 
  and 
  the 
  dissection 
  of 
  ovaries 
  

   show 
  that 
  in 
  reproductive 
  powers 
  the 
  species 
  are 
  similar. 
  It 
  is 
  therefore 
  difficult 
  

   to 
  explain 
  why 
  this 
  grub 
  should 
  be 
  so 
  much 
  less 
  numerous 
  than 
  the 
  other. 
  The 
  

   beetles 
  are 
  just 
  as 
  hardy, 
  and 
  in 
  the 
  laboratory 
  the 
  grubs 
  are 
  not 
  nearly 
  so 
  easily 
  

   injured 
  as 
  those 
  of 
  the 
  sandy 
  soil 
  species. 
  The 
  explanation 
  of 
  the 
  relative 
  scarcity 
  

   of 
  this 
  grub 
  will 
  probably 
  be 
  found 
  in 
  the 
  presence 
  of 
  some 
  enemy 
  which 
  attacks 
  

   R. 
  subnitida 
  only 
  and 
  has 
  so 
  far 
  escaped 
  observation, 
  or 
  in 
  the 
  existence 
  of 
  some 
  

   other 
  adverse 
  factor 
  in 
  the 
  soil 
  types 
  frequented 
  by 
  this 
  grub. 
  This 
  is 
  a 
  point 
  

   worthy 
  of 
  further 
  investigation. 
  

  

  The 
  control 
  measures 
  recommended 
  for 
  R. 
  vestita 
  will 
  also 
  be 
  of 
  assistance 
  in 
  

   checking 
  the 
  destructive 
  activities 
  of 
  this 
  species. 
  

  

  Fig. 
  3. 
  Rhojpaea 
  subnitida, 
  Arrow, 
  X 
  4 
  ; 
  

  

  a, 
  portion 
  of 
  elytra 
  highly 
  magnified 
  

  

  to 
  show 
  the 
  scaling. 
  

  

  Fig 
  4. 
  Rhopaea 
  vestita, 
  Arrow, 
  X 
  4 
  ; 
  

  

  a, 
  portion 
  of 
  elytra 
  highly 
  magnified 
  

  

  to 
  show 
  the 
  scaling. 
  

  

  The 
  Rose 
  Beetle 
  (Adoretus 
  versutus, 
  Har.) 
  (fig. 
  5). 
  

  

  The 
  rose 
  beetle 
  is 
  not 
  generally 
  regarded 
  as 
  a 
  pest 
  of 
  cane, 
  but 
  on 
  a 
  recent 
  plantation 
  

   inspection 
  the 
  writer 
  observed 
  the 
  grubs 
  of 
  this 
  species 
  attacking 
  the 
  germinating 
  eyes 
  

   of 
  cane 
  sets 
  planted 
  some 
  two 
  or 
  three 
  weeks 
  previously. 
  

  

  The 
  grubs 
  of 
  this 
  Rutelid 
  beetle 
  have 
  been 
  found 
  in 
  all 
  types 
  of 
  soil, 
  and 
  almost 
  

   invariably 
  occur 
  within 
  six 
  inches 
  of 
  the 
  surface. 
  The 
  beetles 
  are 
  found 
  all 
  the 
  year 
  

   round 
  and 
  are 
  a 
  great 
  nuisance 
  to 
  all 
  rose 
  growers, 
  as 
  they 
  attack 
  and 
  destroy 
  the 
  

  

  