﻿REPORT 
  OF 
  THE 
  SIATE 
  ENTOMOLOGIST 
  I9OO 
  969 
  

  

  caterpillar 
  are 
  hatching 
  on 
  tree 
  40. 
  Trees 
  50-53. 
  The 
  kerosene 
  is 
  hardly 
  

   apparent, 
  and 
  the 
  trees 
  are 
  budding. 
  

  

  May 
  II. 
  Tree 
  3 
  is 
  in 
  full 
  bloom 
  (pi. 
  5), 
  most 
  conclusive 
  evidence 
  

   that 
  the 
  buds 
  have 
  not 
  been 
  injured 
  by 
  the 
  insecticide. 
  Tree 
  39 
  is 
  

   more 
  backward 
  than 
  40. 
  The 
  former 
  is 
  much 
  more 
  infested 
  with 
  the 
  

   scale 
  than 
  the 
  latter. 
  The 
  full 
  bloom 
  of 
  trees 
  3 
  and 
  5 
  1 
  is 
  well 
  shown 
  on 
  

   pi. 
  5, 
  7 
  which 
  were 
  taken 
  May 
  12, 
  

  

  May 
  14, 
  Trees 
  i, 
  2, 
  3, 
  8-14 
  are 
  unharmed, 
  the 
  leaves 
  are 
  out 
  well, 
  

   and 
  the 
  blossoms 
  are 
  numerous. 
  Trees 
  38-40 
  are 
  a 
  Httle 
  more 
  advanced 
  

   than 
  trees 
  2>^ 
  and 
  37 
  (treated 
  with 
  25% 
  kerosene), 
  except 
  tree 
  39, 
  which 
  

   is 
  in 
  very 
  bad 
  condition 
  on 
  account 
  of 
  the 
  scale. 
  Tree 
  50. 
  The 
  leaves 
  

   are 
  well 
  out, 
  abundant, 
  and 
  the 
  blossoms 
  are 
  about 
  to 
  appear. 
  Trees 
  

   51-53. 
  The 
  leaves 
  are 
  nearly 
  out, 
  and 
  the 
  rather 
  abundant 
  blossoms 
  are 
  

   almost 
  past. 
  

  

  May 
  28. 
  Tree 
  39 
  is 
  in 
  very 
  bad 
  condition, 
  as 
  half 
  of 
  the 
  top 
  is 
  dead, 
  

   the 
  result 
  in 
  all 
  probability 
  of 
  excessive 
  infestation 
  by 
  the 
  scale. 
  Tree 
  

   50 
  is 
  healthy, 
  the 
  foliage 
  is 
  thick 
  and 
  bright 
  green. 
  

  

  July 
  2. 
  The 
  young 
  had 
  evidently 
  begun 
  to 
  appear 
  several 
  days 
  pre- 
  

   viously, 
  as 
  a 
  number 
  were 
  found 
  in 
  the 
  white 
  stage. 
  The 
  trees 
  were 
  all 
  

   examined 
  for 
  the 
  presence 
  of 
  living 
  young, 
  this 
  being 
  the 
  surest 
  test 
  of 
  

   the 
  efficacy 
  of 
  the 
  insecticide. 
  Trees 
  3, 
  8-14. 
  Young 
  scales 
  are 
  abund- 
  

   ant. 
  Tree 
  38, 
  Living 
  young 
  are 
  comparatively 
  few. 
  Tree 
  39 
  had 
  

   been 
  removed. 
  Tree 
  40. 
  Living 
  young 
  are 
  numerous. 
  Trees 
  50-53. 
  

   Living 
  young 
  are 
  very 
  numerous. 
  This 
  record 
  shows 
  most 
  conclusively 
  

   that 
  a 
  mechanical, 
  20% 
  kerosene 
  emulsion 
  will 
  not 
  injure 
  fruit 
  trees 
  when 
  

   applied 
  just 
  before 
  the 
  buds 
  open, 
  and 
  it 
  also 
  shows, 
  unfortunately, 
  that 
  

   it 
  does 
  not 
  kill 
  the 
  San 
  Jose 
  scale 
  under 
  these 
  conditions. 
  The 
  young 
  

   were 
  produced 
  in 
  such 
  large 
  numbers 
  that 
  it 
  was 
  decided 
  to 
  give 
  a 
  sum- 
  

   mer 
  application. 
  The 
  vigorous 
  condition 
  of 
  tree 
  8, 
  photographed 
  on 
  this 
  

   date, 
  is 
  shown 
  on 
  pi. 
  8 
  and 
  is 
  there 
  compared 
  with 
  tree 
  93, 
  which 
  was 
  

   photographed 
  the 
  same 
  day. 
  

  

  July 
  16. 
  This 
  was 
  a 
  dry, 
  very 
  warm, 
  practically 
  clear 
  day 
  and 
  the 
  

   above 
  listed 
  trees 
  were 
  sprayed 
  with 
  a 
  10% 
  mechanical 
  kerosene 
  emul- 
  

   sion. 
  There 
  was 
  a 
  breeze 
  most 
  of 
  the 
  time, 
  and 
  the 
  mixture 
  evaporated 
  

   very 
  rapidly. 
  In 
  subsequent 
  observations 
  account 
  must 
  be 
  taken 
  of 
  this 
  

   treatment. 
  

  

  July 
  19. 
  The 
  foliage 
  of 
  these 
  trees 
  was 
  practically 
  unaffected 
  by 
  the 
  

   insecticide, 
  and 
  a 
  large 
  proportion 
  of 
  the 
  tender 
  young 
  scales 
  were 
  killed. 
  

  

  July 
  30. 
  On 
  trees 
  8-10 
  there 
  were 
  some 
  living 
  young, 
  on 
  trees 
  11, 
  12, 
  

   14, 
  38, 
  40 
  and 
  53 
  most 
  of 
  the 
  scales 
  were 
  dead, 
  on 
  tree 
  13 
  only 
  a 
  part 
  of 
  

  

  