﻿968 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  shown 
  on 
  pi. 
  3. 
  Each 
  tree 
  received 
  a 
  number, 
  which 
  was 
  retained 
  

   throughout 
  the 
  experiment. 
  Notes 
  on 
  the 
  the 
  condition 
  of 
  the 
  individual 
  

   tree 
  precede 
  the 
  experimental 
  records 
  given 
  under 
  the 
  various 
  insecti- 
  

   cides. 
  All 
  the 
  spraying 
  was 
  done 
  with 
  a 
  Gould 
  kerowater 
  sprayer, 
  and 
  

   the 
  mechanical 
  emulsions 
  were 
  those 
  delivered 
  by 
  this 
  excellent 
  appa- 
  

   ratus 
  through 
  a 
  pair 
  of 
  cyclone 
  nozzles. 
  

  

  Experiments 
  with 
  kerosene 
  against 
  San 
  Jose 
  scale. 
  This 
  

   insecticide 
  was 
  applied 
  in 
  three 
  strengths, 
  20 
  and 
  25% 
  mechanical 
  

   emulsions 
  and 
  undiluted. 
  The 
  treatment 
  was 
  given 
  Ap. 
  11, 
  at 
  which 
  

   time 
  the 
  buds 
  had 
  not 
  started. 
  

  

  20% 
  mechanical 
  emulsion. 
  17 
  trees 
  were 
  treated 
  with 
  this 
  kerosene 
  

   mixture. 
  Their 
  condition 
  at 
  the 
  time 
  of 
  spraying, 
  Ap. 
  11, 
  was 
  as 
  fol- 
  

   lows. 
  Trees 
  i 
  and 
  2 
  were 
  large 
  apple 
  trees, 
  slightly 
  infested 
  with 
  the 
  

   scale. 
  The 
  spraying 
  apparatus 
  was 
  not 
  adapted 
  to 
  treating 
  large 
  trees, 
  

   and 
  these 
  two 
  were 
  included 
  simply 
  because 
  they 
  were 
  m 
  the 
  field, 
  and 
  

   their 
  treatment 
  was 
  more 
  to 
  keep 
  the 
  pest 
  in 
  check 
  than 
  for 
  experimental 
  

   purposes. 
  Tree 
  3, 
  a 
  light 
  oxheart 
  cherry 
  12 
  feet 
  high, 
  was 
  moderately 
  

   infested 
  with 
  the 
  scale. 
  It 
  was 
  a 
  vigorous 
  tree, 
  which 
  had 
  not 
  suffered 
  

   to 
  any 
  appreciable 
  extent 
  from 
  the 
  pest. 
  Tree 
  8, 
  a 
  badly 
  infested 
  Lom- 
  

   bard 
  plum, 
  was 
  14 
  feet 
  high. 
  Its 
  vigor 
  had 
  not 
  been 
  seriously 
  affected 
  

   by 
  the 
  scale. 
  Tree 
  9, 
  a 
  badly 
  infested 
  botan 
  plum 
  19 
  feet 
  high, 
  was 
  in 
  

   about 
  the 
  same 
  condition 
  as 
  tree 
  8. 
  Tree 
  10, 
  a 
  moderately 
  infested 
  

   beurre 
  bosc 
  pear, 
  was 
  12 
  feet 
  high. 
  Trees 
  11-14 
  are 
  seckel 
  pears; 
  the 
  

   first 
  was 
  about 
  9 
  feet 
  high 
  and 
  moderately 
  infested, 
  the 
  others 
  were 
  

   about 
  15 
  feet 
  high 
  and 
  badly 
  infested 
  with 
  the 
  scale. 
  The 
  vitality 
  of 
  

   none 
  of 
  them 
  had 
  been 
  seriously 
  impaired. 
  Trees 
  38-39, 
  very 
  badly 
  

   infested 
  globe 
  peachtrees, 
  were 
  8 
  feet 
  high. 
  Tree 
  40, 
  a 
  badly 
  infested 
  

   Crawford 
  peachtree, 
  was 
  10 
  feet 
  high. 
  Tree 
  50, 
  a 
  badly 
  infested 
  Idaho 
  

   pear, 
  was 
  10 
  feet 
  high. 
  Tree 
  51, 
  a 
  moderately 
  infested 
  botan 
  plum, 
  was 
  

   10 
  feet 
  high. 
  Trees 
  52 
  and 
  53 
  were 
  the 
  same 
  as 
  51, 
  except 
  that 
  they 
  

   were 
  badly 
  infested 
  and 
  were 
  13 
  feet 
  high. 
  The 
  spraying 
  was 
  as 
  thor- 
  

   ough 
  as 
  could 
  be 
  given 
  without 
  having 
  large 
  amounts 
  of 
  the 
  oil 
  and 
  

   water 
  run 
  down 
  the 
  trunk. 
  The 
  work 
  was 
  done 
  on 
  a 
  sunny, 
  airy 
  day. 
  

   The 
  next 
  day 
  it 
  rained 
  considerably 
  and 
  this 
  was 
  followed 
  by 
  more 
  

   rain 
  within 
  a 
  few 
  days. 
  

  

  Ap. 
  19. 
  Tree 
  3, 
  the 
  buds 
  are 
  bursting, 
  and 
  httle 
  or 
  no 
  kerosene 
  is 
  

   evident, 
  though 
  the 
  bark 
  is 
  somewhat 
  greasy. 
  Trees 
  8-14. 
  The 
  kerosene 
  

   is 
  scarcely 
  evident, 
  and 
  the 
  bark 
  is 
  somewhat 
  greasy. 
  Trees 
  38-40.. 
  

   The 
  kerosene 
  is 
  hardly 
  evident. 
  The 
  buds 
  are 
  starting, 
  and 
  there 
  are 
  

   jiving 
  cigar 
  case-bearer 
  larvae 
  on 
  tree 
  38, 
  and 
  eggs 
  of 
  the 
  appletree 
  tent- 
  

  

  