﻿566 
  

  

  One 
  lb. 
  of 
  Paris 
  green 
  in 
  6 
  gals, 
  of 
  water 
  proved 
  an 
  effective 
  pro- 
  

   portion. 
  In 
  three 
  experiments, 
  Jib. 
  of 
  Paris 
  green 
  was 
  mixed 
  with 
  

   3 
  gals, 
  of 
  water 
  and 
  2 
  lb. 
  of 
  molasses 
  were 
  added. 
  In 
  one 
  of 
  these, 
  

   the 
  enclosed 
  area, 
  which 
  was 
  well 
  covered 
  with 
  grass, 
  was 
  sprayed 
  at 
  

   11 
  a.m. 
  on 
  a 
  dull 
  day, 
  there 
  being 
  a 
  httle 
  rain 
  at 
  11.30 
  a.m. 
  At 
  5.20 
  

   p.m. 
  on 
  the 
  same 
  day 
  10 
  per 
  cent, 
  of 
  the 
  locusts 
  were 
  dead 
  and 
  this 
  

   figure 
  rose 
  to 
  90 
  per 
  cent, 
  by 
  9 
  a.m. 
  on 
  the 
  following 
  morning. 
  In 
  

   two 
  other 
  experiments, 
  areas 
  of 
  12 
  square 
  yards 
  containing 
  hoppers 
  

   of 
  the 
  5th 
  instar 
  were 
  enclosed 
  and 
  sprayed 
  at 
  11 
  a.m. 
  in 
  the 
  hot 
  sun. 
  

   At 
  8.30 
  a.m. 
  about 
  70 
  per 
  cent, 
  of 
  the 
  enclosed 
  locusts 
  were 
  alive, 
  

   but 
  some 
  were 
  developing 
  wings, 
  which 
  would 
  account 
  for 
  their 
  not 
  

   feeding. 
  Paris 
  green 
  is 
  slow 
  in 
  its 
  effect, 
  and 
  in 
  considering 
  the 
  result 
  

   of 
  these 
  experiments 
  it 
  must 
  be 
  remembered 
  that 
  the 
  locusts 
  were 
  

   enclosed 
  and 
  had 
  no 
  option 
  but 
  to 
  eat 
  the 
  poisoned 
  grass. 
  

  

  In 
  solutions 
  of 
  the 
  strengths 
  mentioned 
  above, 
  the 
  relative 
  costs 
  of 
  

   the 
  three 
  poisons 
  work 
  out 
  at 
  the 
  following 
  rates 
  per 
  gallon 
  in 
  the 
  Fede- 
  

   rated 
  Malay 
  States 
  : 
  — 
  Paris 
  green, 
  ?>d. 
  ; 
  London 
  purple, 
  ^d. 
  ; 
  arsenite 
  of 
  

   soda, 
  \\d. 
  ; 
  the 
  latter 
  being 
  thus 
  not 
  only 
  the 
  most 
  effective 
  but 
  the 
  

   cheapest. 
  A 
  nozzle 
  producing 
  a 
  very 
  fine 
  mist 
  should 
  be 
  used. 
  Four 
  

   gallons 
  of 
  solution 
  should 
  cover 
  about 
  400 
  square 
  yards 
  (48 
  gals, 
  per 
  

   acre), 
  and 
  a 
  coolie 
  under 
  normal 
  conditions 
  can 
  spray 
  1 
  acre 
  a 
  day. 
  

   Very 
  great 
  care 
  must 
  be 
  taken 
  in 
  using 
  strong 
  solutions 
  of 
  arsenite, 
  

   and 
  spraying 
  should 
  not 
  be 
  carried 
  out 
  in 
  the 
  precincts 
  of 
  native 
  

   villages, 
  unless 
  special 
  precautions 
  be 
  taken 
  to 
  prevent 
  fowls, 
  &c., 
  

   being 
  poisoned. 
  Arsenite 
  of 
  soda 
  cannot 
  be 
  sprayed 
  on 
  plants 
  that 
  

   must 
  not 
  be 
  killed, 
  but 
  is 
  satisfactory 
  in 
  other 
  respects, 
  as 
  grasses 
  

   sprayed 
  die 
  very 
  rapidly 
  and 
  cattle 
  cannot 
  therefore 
  graze 
  over 
  a 
  

   poisoned 
  area. 
  It 
  is 
  not 
  easy 
  to 
  boil 
  water 
  in 
  the 
  field, 
  but 
  this 
  is 
  not 
  

   necessary 
  if 
  the 
  arsenite 
  is 
  well 
  ground 
  up. 
  

  

  Insect 
  Notes. 
  — 
  Ann. 
  Rept. 
  Deft. 
  Agric. 
  & 
  Cr. 
  Lands, 
  Seychelles, 
  for 
  

   1913, 
  Victoria, 
  1914, 
  pp. 
  13-17. 
  

  

  Coccus 
  viridis 
  (Lecanium 
  viride) 
  is 
  reported 
  as 
  still 
  doing 
  great 
  

   damage 
  in 
  the 
  country 
  to 
  coffee, 
  citrus 
  and 
  ixora 
  bushes 
  in 
  spite 
  of 
  

   the 
  fungus 
  Cephalosporium 
  lecanii, 
  which 
  keeps 
  the 
  insect 
  in 
  check 
  

   more 
  easily 
  above 
  1,000 
  feet 
  elevation. 
  This 
  fungus 
  has 
  been 
  

   found 
  this 
  year 
  attacking 
  Eucalymnatus 
  tessellatus 
  (Lecanium 
  tessellatum) 
  

   on 
  cinnamon. 
  Chrysomphalus 
  aonidum 
  (Aspidiotus 
  ficus) 
  has 
  extended 
  

   during 
  the 
  last 
  three 
  years 
  to 
  various 
  islands 
  of 
  the 
  Archipelago, 
  

   some 
  at 
  150 
  miles 
  distance 
  from 
  Mahe, 
  and 
  coconut 
  trees 
  were 
  seriously 
  

   attacked. 
  The 
  following 
  trees 
  used 
  as 
  supports 
  for 
  vanilla 
  between 
  

   limes 
  and 
  coconut 
  were 
  also 
  attacked 
  by 
  this 
  scale 
  : 
  — 
  Frangipane 
  

   (Plumeria 
  acuminata), 
  breadfruit 
  (Artocarpus 
  incisa), 
  pseudo-sago 
  palm 
  

   (Cycas 
  officinalis) 
  ; 
  citrus 
  and 
  roses 
  are 
  also 
  food-plants 
  of 
  this 
  insect. 
  

   Frangipane 
  should 
  never 
  be 
  grown 
  amongst 
  coconuts 
  because 
  it 
  is 
  

   the 
  common 
  food-plant 
  of 
  Coccus 
  (Lecanium) 
  hesperidum. 
  The 
  

   Takamaka 
  (Calophyllum 
  triophyllum) 
  is 
  also 
  a 
  host 
  plant 
  of 
  Euca- 
  

   lymnatus 
  tessellatus 
  and 
  is 
  constantly 
  present 
  on 
  cinnamon 
  plants 
  used 
  

   as 
  supports 
  for 
  vanilla 
  in 
  or 
  near 
  coconut 
  plantations. 
  

  

  Chrysomphalus 
  aonidum 
  spreads 
  suddenly 
  after 
  remaining 
  dormant 
  

   for 
  years 
  and 
  it 
  is 
  very 
  important 
  that 
  it 
  should 
  be 
  combated 
  in 
  this 
  

   dormant 
  state, 
  especially 
  on 
  small 
  trees 
  and 
  roses 
  which 
  are 
  more 
  

  

  