﻿602 
  

  

  Paris 
  green 
  was 
  first 
  used, 
  but 
  as 
  it 
  frequently 
  burns 
  tobacco 
  severely 
  

   and 
  may 
  reduce 
  the 
  value 
  of 
  the 
  crop 
  as 
  much 
  as 
  50 
  per 
  cent., 
  investiga- 
  

   tions 
  during 
  the 
  past 
  five 
  years 
  have 
  resulted 
  in 
  arsenate 
  of 
  lead 
  

   (diplumbic) 
  being 
  found 
  to 
  meet 
  the 
  requirements. 
  The 
  author 
  

   describes 
  and 
  gives 
  the 
  results 
  of 
  experimental 
  applications 
  of 
  this 
  

   insecticide 
  in 
  both 
  fine 
  and 
  rainy 
  weather. 
  Arsenate 
  of 
  lead 
  should 
  

   be 
  appHed 
  in 
  the 
  form 
  of 
  a 
  powder 
  when 
  there 
  is 
  no 
  breeze 
  and 
  

   when 
  dew 
  is 
  still 
  on 
  the 
  plants. 
  The 
  quantity 
  required 
  varies 
  from 
  3 
  J 
  

   pounds 
  to 
  5 
  pounds 
  per 
  acre, 
  using 
  a 
  dust 
  gun 
  having 
  a 
  fan 
  diameter 
  

   of 
  at 
  least 
  eight 
  inches. 
  When 
  apphed 
  in 
  powdered 
  form 
  it 
  must 
  

   be 
  mixed 
  with 
  a 
  carrier, 
  the 
  best 
  found 
  so 
  far 
  being 
  dry 
  wood-ashes, 
  

   used 
  in 
  a 
  bulk 
  at 
  least 
  equal 
  to 
  the 
  arsenate 
  of 
  lead. 
  If 
  applied 
  as 
  a 
  

   spray, 
  use 
  3 
  to 
  4 
  pounds 
  in 
  100 
  (U.S.) 
  gallons 
  of 
  water 
  (85 
  gals. 
  Imp.) 
  

  

  The 
  Use 
  of 
  Carbon 
  Bisulphide 
  in 
  Emulsion 
  at 
  Martinique 
  and 
  Guade- 
  

   loupe. 
  — 
  Agric. 
  News, 
  Barbados, 
  xiii, 
  no. 
  317, 
  20th 
  June 
  1914, 
  

   pp. 
  202-203. 
  

  

  This 
  article 
  by 
  G. 
  Bordaz 
  originally 
  appeared 
  in 
  the 
  Martinique 
  

   newspaper, 
  La 
  Paix, 
  for 
  9th 
  and 
  14th 
  May 
  1914. 
  In 
  Martinique, 
  

   as 
  in 
  Guadeloupe, 
  cacao, 
  coffee, 
  lime 
  and 
  other 
  trees 
  are 
  destroyed 
  

   by 
  white 
  grubs 
  and 
  by 
  eel-worms. 
  Amongst 
  the 
  former 
  the 
  most 
  

   dangerous 
  is 
  the 
  larva 
  of 
  a 
  weevil, 
  Exophthalmus 
  famelicus, 
  which 
  

   causes 
  the 
  death 
  of 
  young 
  cacao 
  trees, 
  and 
  also 
  attacks 
  plantations 
  

   of 
  lime 
  trees 
  which 
  have 
  replaced 
  sugar-cane 
  ; 
  for 
  this 
  reason 
  it 
  is 
  said 
  

   that 
  cacao 
  trees 
  cannot 
  succeed 
  in 
  land 
  previously 
  planted 
  in 
  sugar- 
  

   cane. 
  Eel 
  worms 
  chiefly 
  attack 
  Arabian 
  or 
  Martinique 
  coffee 
  and 
  

   whole 
  plantations 
  have 
  disappeared 
  from 
  this 
  cause. 
  It 
  has 
  been 
  

   proposed 
  to 
  graft 
  Liberian 
  stocks, 
  which, 
  with 
  Robusta 
  coffee, 
  is 
  

   the 
  only 
  coffee 
  left 
  in 
  Martinique, 
  but 
  simple 
  treatment 
  with 
  carbon 
  

   bisulphide 
  would 
  have 
  eradicated 
  both 
  eel-worms 
  and 
  Exophthalmus 
  

   larvae. 
  The 
  use 
  of 
  carbon 
  bisulphide, 
  however, 
  has 
  not 
  become 
  as 
  

   general 
  as 
  was 
  hoped, 
  and 
  as 
  a 
  result 
  Arabian 
  coffee 
  has 
  practically 
  

   disappeared 
  from 
  cultivation, 
  while 
  in 
  1913 
  the 
  output 
  of 
  cacao 
  was 
  

   about 
  27 
  tons 
  less 
  than 
  the 
  average 
  export 
  for 
  the 
  previous 
  five 
  years. 
  

  

  Emulsion 
  pumps 
  and 
  soil 
  injectors, 
  which 
  are 
  recommended 
  for 
  

   use 
  on 
  large 
  properties, 
  are 
  not 
  always 
  available 
  to 
  the 
  small 
  planter, 
  

   and 
  in 
  the 
  circumstances 
  the 
  most 
  efficacious 
  method 
  is 
  to 
  pour 
  

   the 
  emulsion 
  round 
  the 
  foot 
  of 
  each 
  tree. 
  An 
  emulsion 
  made 
  with 
  oil, 
  

   which 
  is 
  very 
  easy 
  to 
  use 
  and 
  less 
  expensive 
  than 
  one 
  made 
  with 
  

   alcohol, 
  is 
  prepared 
  as 
  follows 
  : 
  Equal 
  volumes 
  of 
  carbon 
  bisulphide 
  

   and 
  vegetable 
  oil 
  of 
  the 
  lowest 
  quality 
  obtainable 
  (castor 
  or 
  cotton 
  

   seed 
  oil) 
  are 
  mixed 
  together 
  to 
  form 
  the 
  stock 
  solution. 
  The 
  dose 
  of 
  stock 
  

   solution 
  to 
  be 
  employed 
  per 
  plant 
  should 
  be 
  poured 
  into 
  the 
  requisite 
  

   quantity 
  of 
  water, 
  which 
  has 
  previously 
  been 
  rendered 
  alkaHne 
  

   by 
  the 
  addition 
  of 
  IJ 
  oz. 
  of 
  carbonate 
  of 
  soda 
  per 
  gallon. 
  For 
  cacao 
  

   the 
  best 
  time 
  for 
  treatment 
  is 
  during 
  September 
  and 
  October, 
  and 
  those 
  

   months 
  which 
  follow 
  on 
  the 
  dry 
  season 
  in 
  the 
  case 
  of 
  coffee 
  ; 
  but 
  it 
  

   should 
  be 
  carried 
  out 
  in 
  fine 
  weather, 
  when 
  the 
  dry 
  soil 
  will 
  rapidly 
  absorb 
  

   the 
  emulsion, 
  for 
  treatment 
  in 
  rainy 
  weather 
  is 
  wasteful. 
  In 
  treating 
  

   Arabian 
  coffee 
  for 
  eelworm, 
  the 
  emulsion 
  should 
  contain 
  2 
  parts 
  of 
  stock 
  

   solution' 
  to 
  1,000 
  of 
  water, 
  and 
  with 
  this 
  the 
  ground 
  round 
  the 
  foot 
  of 
  

  

  