﻿580 
  

  

  the 
  entire 
  plant. 
  Zimmermann 
  discovered 
  it 
  in 
  October 
  1910, 
  at 
  

   Morogoro, 
  where 
  it 
  has 
  since 
  increased, 
  but 
  fortunately 
  has 
  not 
  

   spread 
  to 
  any 
  extent 
  and 
  only 
  occurs 
  elsewhere 
  at 
  Amani. 
  This 
  weevil 
  

   bores 
  into 
  the 
  green 
  bolls 
  and 
  stems, 
  where 
  it 
  oviposits. 
  The 
  larvae 
  

   excavate 
  galleries 
  and 
  a 
  chamber 
  in 
  which 
  they 
  pupate, 
  and 
  kill 
  the 
  

   plants 
  in 
  severe 
  cases. 
  Another 
  species, 
  A. 
  armipes, 
  Wagn., 
  found 
  

   in 
  West 
  Usambara, 
  attacks 
  the 
  stem 
  and 
  branches, 
  but 
  apparently 
  

   not 
  the 
  bolls. 
  The 
  plants 
  should 
  be 
  burnt 
  when 
  the 
  crop 
  has 
  been 
  

   gathered, 
  which 
  should 
  be 
  done 
  as 
  early 
  as 
  possible. 
  Alcides 
  brevi- 
  

   rostriSy 
  Boh., 
  is 
  found 
  in 
  all 
  districts 
  and 
  rings 
  the 
  stems, 
  usually 
  near 
  

   the 
  ground. 
  One 
  portion 
  of 
  the 
  ring 
  is 
  very 
  much 
  widened 
  and 
  the 
  

   egg 
  is 
  laid 
  there. 
  This 
  ringing 
  is 
  done 
  in 
  May, 
  or 
  later, 
  and 
  the 
  injury 
  

   becomes 
  apparent 
  about 
  four 
  months 
  after 
  sowing 
  ; 
  all 
  infested 
  stems 
  

   must 
  be 
  cut 
  off 
  beneath 
  the 
  ring 
  and 
  burned. 
  Among 
  other 
  weevils, 
  

   Dicasticus 
  gerstaeckeri, 
  Fst., 
  and 
  Sy 
  states 
  pollinosus, 
  Gerst., 
  are 
  very 
  

   occasionally 
  found 
  on 
  cotton 
  ; 
  Epipedosoma 
  laticolle, 
  Kolbe, 
  occurred 
  

   in 
  numbers 
  on 
  cotton 
  on 
  KiHmandjaro. 
  

  

  Lepidopterous 
  cotton 
  pests 
  include 
  the 
  spiny 
  boll 
  worm, 
  Farias 
  

  

  insulana, 
  Boisd., 
  which 
  has 
  not 
  been 
  reported 
  recently 
  except 
  from 
  

  

  near 
  Kilossa 
  and 
  Morogoro, 
  where 
  it 
  has 
  lately 
  appeared 
  in 
  numbers. 
  

  

  Hibiscus 
  esculentus 
  and 
  H. 
  cannabinus 
  should 
  not 
  be 
  allowed 
  to 
  grow 
  

  

  near 
  cotton, 
  as 
  they 
  also 
  are 
  hosts 
  of 
  this 
  species. 
  Farias 
  biplaga. 
  Walk. 
  

  

  {plaga, 
  Feld.) 
  was 
  found 
  in 
  a 
  cotton 
  field 
  in 
  Mombo, 
  but 
  nothing 
  further 
  

  

  is 
  known 
  about 
  it. 
  The 
  Egyptian 
  cotton 
  worm, 
  Prodenia 
  litura, 
  F., 
  is 
  

  

  found 
  in 
  East 
  Africa, 
  where 
  the 
  caterpillars 
  are 
  observed 
  in 
  the 
  green 
  

  

  bolls 
  ; 
  the 
  caterpillars 
  oiPorihesia 
  producta 
  have 
  been 
  frequently 
  noticed, 
  

  

  but 
  do 
  little 
  injury 
  to 
  the 
  leaves 
  ; 
  Chaerocampa 
  celerio, 
  L., 
  was 
  once 
  

  

  observed 
  in 
  Mombo 
  in 
  May, 
  its 
  caterpillars 
  appearing 
  in 
  numbers 
  and 
  

  

  stripping 
  the 
  cotton 
  plants 
  bare 
  ; 
  a 
  small 
  Saturniid 
  caterpillar 
  

  

  destroyed 
  about 
  10 
  acres 
  of 
  cotton 
  in 
  the 
  Dar-es-Salaam 
  district 
  ; 
  

  

  Sylepta 
  derogata, 
  F. 
  (Synclera 
  multilinealis, 
  Guene), 
  has 
  not 
  been 
  

  

  much 
  noticed 
  of 
  late 
  years 
  and 
  does 
  only 
  slight 
  injury 
  ; 
  Ephestia 
  

  

  cautella, 
  Walk. 
  (E. 
  cahiritella, 
  ZelL), 
  was 
  found 
  in 
  cotton 
  seed. 
  The 
  

  

  pink 
  boll 
  worm, 
  Gelechia 
  gossypiella, 
  Saund., 
  is 
  still 
  the 
  most 
  dangerous 
  

  

  enemy 
  of 
  cotton 
  in 
  East 
  Africa. 
  Although 
  no 
  wild 
  food-plants 
  have 
  

  

  as 
  yet 
  been 
  discovered 
  in 
  the 
  colony, 
  this 
  insect 
  appears 
  to 
  be 
  native, 
  

  

  but 
  may 
  have 
  been 
  imported 
  with 
  foreign 
  seed. 
  Control 
  measures 
  

  

  are 
  the 
  same 
  as 
  advised 
  for 
  Apion 
  armipes. 
  An 
  undetermined 
  species 
  

  

  of 
  Gelechia 
  has 
  been 
  observed 
  by 
  the 
  author 
  feeding 
  on 
  cotton 
  leaves 
  

  

  in 
  the 
  centre 
  and 
  south 
  of 
  the 
  colony. 
  Pyroderces 
  simplex, 
  Wlsm., 
  

  

  seems 
  to 
  occur 
  in 
  all 
  districts, 
  being 
  sometimes 
  more 
  plentiful 
  than 
  

  

  G. 
  gossypiella. 
  The 
  author 
  states 
  that 
  the 
  larvae 
  are 
  not 
  merely 
  

  

  rubbish-feeders, 
  but 
  do 
  as 
  much 
  damage 
  to 
  the 
  seed 
  as 
  do 
  those 
  of 
  

  

  Gelechia. 
  Light- 
  traps 
  appear 
  to 
  be 
  of 
  some 
  use 
  in 
  this 
  case. 
  

  

  Setomorpha 
  insectella, 
  F., 
  was 
  found 
  in 
  old 
  cotton 
  seed. 
  

  

  Amongst 
  the 
  Rhynchota, 
  eight 
  species 
  of 
  Dysdercus 
  are 
  native 
  to 
  

   the 
  coimtry, 
  and 
  four 
  of 
  these 
  occur 
  on 
  cotton, 
  viz., 
  Dysdercus 
  cardina- 
  

   lis, 
  Gerst., 
  D.fasdatus, 
  Sign., 
  D. 
  nigrofasciatus, 
  St., 
  D. 
  super 
  stitiosus, 
  F. 
  

   These 
  bugs 
  may 
  be 
  shaken 
  down 
  into 
  a 
  sheet 
  and 
  killed 
  in 
  water 
  

   containing 
  petroleum, 
  and 
  the 
  collection 
  may 
  be 
  facihtated 
  by 
  the 
  

   use 
  of 
  baits, 
  such 
  as 
  piles 
  of 
  cotton 
  seed. 
  Phonoctonus 
  fasciatus, 
  

   P. 
  de 
  B., 
  is 
  a 
  natural 
  enemy, 
  but 
  has 
  Httle 
  value, 
  especially 
  as 
  the 
  

   stainers 
  are 
  of 
  only 
  sUght 
  importance. 
  The 
  Lygaeid, 
  Oxycarenus 
  

  

  