﻿REPORT 
  OF 
  THE 
  STATE 
  ENTOMOLOGIST 
  I9OO 
  985 
  

  

  81, 
  globe 
  peach 
  12 
  feet 
  high, 
  were 
  but 
  moderately 
  infested 
  with 
  the 
  

   San 
  Jose 
  scale. 
  Tree 
  102, 
  a 
  beurre 
  bosc 
  pear 
  10 
  feet 
  high, 
  and 
  tree 
  103 
  

   an 
  Idaho 
  pear 
  13 
  feet 
  high, 
  were 
  respectively, 
  moderately 
  and 
  very 
  badly 
  

   infested 
  with 
  the 
  scale. 
  The 
  buds 
  had 
  started 
  a 
  little 
  when 
  these 
  trees 
  

   were 
  treated. 
  

  

  Ap. 
  19. 
  Tree 
  102 
  was 
  subjected 
  to 
  the 
  action 
  of 
  the 
  gas 
  from 
  10.47- 
  

   11.23 
  a. 
  m. 
  The 
  day 
  was 
  bright. 
  

  

  Ap. 
  20. 
  Tree 
  80 
  was 
  fumigated 
  from 
  11.58 
  a. 
  m. 
  to 
  12.23 
  P* 
  "^-j 
  while 
  

   the 
  sun 
  was 
  partly 
  obscured. 
  Through 
  accident 
  not 
  all 
  the 
  cyanid 
  was 
  

   turned 
  into 
  the 
  acid. 
  

  

  Tree 
  81 
  was 
  fumigated 
  from 
  11.10-11.45 
  a.m., 
  and 
  tree 
  103 
  from 
  

   10.20-10.57 
  a. 
  m. 
  The 
  sun 
  was 
  bright 
  during 
  both 
  of 
  these 
  treatments. 
  

   Equal 
  amounts 
  of 
  cyanid 
  and 
  sulphuric 
  acid 
  and 
  thrice 
  the 
  amount 
  of 
  

   water 
  were 
  used 
  in 
  fumigating 
  trees 
  8r, 
  102 
  and 
  103. 
  

  

  May 
  II. 
  Trees 
  80 
  and 
  81 
  will 
  apparently 
  develop 
  a 
  goodly 
  number 
  

   of 
  blossoms, 
  and 
  the 
  leaves 
  are 
  starting 
  well. 
  There 
  will 
  be 
  few 
  blossoms 
  

   on 
  tree 
  103. 
  The 
  leaves 
  are 
  nearly 
  extended. 
  

  

  May 
  14. 
  The 
  leaves 
  and 
  blossoms 
  on 
  trees 
  80 
  and 
  81 
  are 
  starting 
  

   well, 
  the 
  latter 
  being 
  abundant. 
  The 
  leaves 
  are 
  pretty 
  well 
  developed 
  

   and 
  rather 
  abundant 
  on 
  trees 
  102 
  and 
  103, 
  and 
  on 
  the 
  former 
  blossoms 
  

   are 
  somewhat 
  scarce, 
  but 
  they 
  are 
  numerous 
  on 
  the 
  latter. 
  

  

  July 
  2. 
  No 
  living 
  young 
  scales 
  can 
  be 
  found 
  on 
  trees 
  80 
  and 
  103 
  and 
  

   but 
  very 
  few 
  on 
  trees 
  81 
  and 
  102. 
  

  

  Aug. 
  3. 
  No 
  living 
  young 
  scales 
  are 
  found 
  on 
  any 
  of 
  these 
  trees 
  at 
  

   this 
  time. 
  

  

  Sep. 
  7. 
  Very 
  few 
  living 
  young 
  are 
  found 
  on 
  trees 
  80 
  and 
  81, 
  none 
  

   on 
  tree 
  102 
  and 
  but 
  few 
  on 
  tree 
  103. 
  

  

  Conclusions 
  

  

  Kerosene. 
  The 
  experiments 
  with 
  kerosene 
  show 
  beyond 
  question 
  that 
  

   neither 
  a 
  20 
  nor 
  a 
  25% 
  mechanical 
  kerosciie 
  emulsion 
  can 
  be 
  relied 
  on 
  

   to 
  kill 
  dormant 
  San 
  Jose 
  scales 
  in 
  this 
  latitude, 
  though 
  either 
  can 
  be 
  used 
  

   in 
  early 
  spring 
  with 
  comparative 
  safety 
  to 
  the 
  tree. 
  A 
  summer 
  applica- 
  

   tion 
  of 
  a 
  10% 
  mechanical 
  kerosene 
  emulsion 
  does 
  not 
  injure 
  the 
  trees 
  

   appreciably, 
  and 
  is 
  a 
  valuable 
  aid 
  in 
  keeping 
  the 
  pest 
  in 
  check, 
  but 
  the 
  

   treatment 
  should 
  be 
  repeated 
  every 
  10 
  days, 
  beginning 
  about 
  June 
  15 
  

   and 
  continuing 
  into 
  September, 
  in 
  order 
  to 
  obtain 
  the 
  best 
  results. 
  The 
  

   experiments 
  with 
  undiluted 
  kerosene 
  are 
  hardly 
  satisfactory, 
  for 
  the 
  reason 
  

   that 
  few 
  trees 
  were 
  involved, 
  and 
  these 
  were 
  in 
  bad 
  condition 
  on 
  account 
  

   of 
  scale 
  injury. 
  The 
  oil 
  did 
  not 
  cause 
  as 
  much 
  injury 
  as 
  was 
  expected, 
  

  

  