﻿459 
  

  

  spring, 
  and 
  require 
  a 
  strong 
  poison, 
  3 
  or 
  -i 
  lb. 
  of 
  arsenate 
  of 
  lead 
  to 
  

   every 
  50 
  gallons 
  of 
  Bordeaux 
  mixture, 
  using 
  less 
  poison 
  later. 
  Where 
  

   the 
  grape-berry 
  moth 
  is 
  serious, 
  spray 
  with 
  Bordeaux 
  and 
  an 
  arsenical 
  

   poison 
  during 
  the 
  middle 
  of 
  July. 
  

  

  For 
  currants 
  and 
  gooseberries 
  infested 
  with 
  scale-insects, 
  the 
  

   same 
  treatment 
  as 
  recommended 
  for 
  apples 
  should 
  be 
  used. 
  As 
  

   the 
  leaves 
  are 
  expanding 
  spray 
  with 
  dilute 
  lime-sulphur 
  or 
  

   Bordeaux, 
  using 
  2 
  lb. 
  arsenate 
  of 
  lead 
  to 
  every 
  50 
  gallons. 
  

   Strawberries 
  suspected 
  of 
  root 
  lice, 
  should 
  be 
  dipped 
  in 
  strong 
  

   tobacco-water 
  before 
  planting. 
  After 
  growth 
  starts, 
  spray 
  with 
  

   Bordeaux 
  and 
  a 
  poison 
  to 
  prevent 
  the 
  leaf-roller 
  insect, 
  and 
  if 
  

   this 
  has 
  been 
  present, 
  spray 
  again 
  after 
  fruiting, 
  but 
  before 
  the 
  leaves 
  

   curl. 
  If 
  potatoes 
  are 
  infested 
  with 
  bugs, 
  spraying 
  should 
  be 
  done 
  at 
  

   once, 
  using 
  Bordeaux 
  mixture 
  and 
  about 
  J 
  lb. 
  of 
  Paris 
  green 
  or 
  2 
  lb. 
  

   arsenate 
  of 
  lead 
  to 
  50 
  gallons 
  of 
  the 
  mixture. 
  This 
  is 
  better 
  for 
  potatoes 
  

   than 
  dilute 
  lime-sulphur. 
  Cucumber-melon 
  vines 
  have 
  several 
  insect 
  

   pests. 
  The 
  striped 
  cucumber 
  beetle 
  (Diahrotica 
  vittata) 
  feeds 
  on 
  the 
  

   leaves 
  and 
  its 
  larvae 
  tunnel 
  in 
  the 
  roots 
  ; 
  injured 
  plants 
  should 
  be 
  

   thinned 
  out, 
  and 
  those 
  remaining 
  be 
  dusted 
  w^ith 
  slaked 
  lime 
  5 
  or 
  6 
  

   parts 
  and 
  flowers 
  of 
  sulphur 
  one 
  part, 
  or 
  arsenate 
  of 
  lead 
  powder 
  mixed 
  

   with 
  9 
  parts 
  of 
  slaked 
  lime. 
  Tobacco 
  dust 
  should 
  be 
  put 
  on 
  the 
  ground 
  

   about 
  the 
  bases 
  of 
  the 
  vines. 
  Paris 
  green 
  is 
  not 
  reliable 
  on 
  these 
  

   vines. 
  The 
  large 
  black 
  squash-bug 
  (Anasa 
  tristis) 
  may 
  be 
  trapped 
  

   under 
  pieces 
  of 
  board. 
  

  

  The 
  preparation 
  of 
  the 
  following 
  spray 
  mixtures 
  is 
  given 
  in 
  

   detail 
  : 
  Strong 
  lime-sulphur, 
  home-made 
  concentrated 
  lime-sulphur, 
  

   commercial 
  concentrated 
  lime-sulphur, 
  self-boiled 
  lime-sulphur, 
  

   Bordeaux 
  mixture, 
  copper 
  sulphate 
  solution, 
  and 
  arsenate 
  of 
  soda 
  

   from 
  a 
  formula 
  by 
  the 
  late 
  Dr. 
  R. 
  C. 
  Kedzie, 
  which 
  is 
  used 
  by 
  

   many 
  local 
  grape-growers 
  in 
  combination 
  with 
  Bordeaux 
  mixture, 
  but 
  

   cannot 
  be 
  used 
  with 
  lime-sulphur 
  sprays. 
  AVhen 
  used 
  alone, 
  as 
  for 
  

   potato 
  bugs, 
  slaked 
  lime 
  must 
  be 
  added 
  or 
  the 
  foliage 
  ^^'ill 
  be 
  burned. 
  

   The 
  formula 
  is 
  2 
  lb. 
  white 
  arsenic, 
  8 
  lb. 
  washing 
  soda, 
  2 
  gallons 
  of 
  

   water 
  ; 
  these 
  materials 
  to 
  be 
  boiled 
  for 
  15 
  minutes 
  or 
  until 
  the 
  arsenic 
  

   dissolves, 
  leaving 
  a 
  muddy 
  sediment 
  ; 
  keep 
  in 
  closed 
  vessel 
  ; 
  1 
  quart 
  

   is 
  equal 
  to 
  \ 
  lb. 
  of 
  Paris 
  green, 
  and 
  usually 
  1 
  quart 
  in 
  50 
  gallons 
  of 
  

   water 
  with 
  some 
  lime 
  or 
  Bordeaux 
  mixture 
  will 
  be 
  sufficient. 
  

   Details 
  of 
  contact 
  poisons 
  for 
  sucking 
  insects, 
  and 
  a 
  table 
  of 
  dilutions 
  

   for 
  concentrated 
  lime-sulphur 
  wash, 
  are 
  also 
  given. 
  

  

  Urich 
  (F. 
  W.). 
  Insect 
  Pests 
  of 
  l^iZ.—BulL 
  Deft. 
  Agric. 
  Trinidad 
  

   and 
  Tobago, 
  Port- 
  of- 
  Spain, 
  xiii, 
  no. 
  79, 
  March- 
  April 
  1914, 
  

   pp. 
  101-103. 
  

  

  The 
  cacao 
  trees, 
  the 
  vitality 
  of 
  which 
  had 
  been 
  much 
  reduced 
  by 
  

   the 
  drought 
  of 
  1912, 
  were 
  severely 
  attacked 
  by 
  thrips 
  in 
  the 
  northern 
  

   part 
  of 
  Trinidad, 
  and 
  by 
  cacao 
  beetles, 
  Stirastoma 
  depressum, 
  in 
  the 
  

   south, 
  at 
  the 
  end 
  of 
  1912 
  and 
  beginning 
  of 
  1913. 
  From 
  March 
  onward, 
  

   the 
  thrips 
  infestation 
  decreased 
  until 
  December, 
  when 
  there 
  was 
  a 
  

   tendency 
  to 
  increase, 
  coinciding 
  with 
  the 
  ripening 
  of 
  the 
  pods, 
  which 
  

   bore 
  out 
  the 
  author's 
  observations 
  that 
  thrips 
  breed 
  and 
  increase 
  on 
  

   nearly 
  matured 
  pods, 
  subsequently 
  migrating 
  to 
  young 
  leaves. 
  Suc- 
  

   cessful 
  results 
  were 
  obtained 
  by 
  forking, 
  liming 
  and 
  draining 
  the 
  

  

  (C46) 
  d2 
  

  

  