﻿976 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Experiments 
  with 
  undiluted 
  oil. 
  Four 
  trees 
  were 
  treated 
  with 
  crude 
  

   oil. 
  The 
  number 
  was 
  limited 
  because 
  it 
  was 
  considered 
  rather 
  

   hazardous 
  to 
  use 
  this 
  material. 
  The 
  condition 
  of 
  the 
  trees 
  at 
  the 
  be- 
  

   ginning 
  of 
  the 
  experiment 
  was 
  as 
  follows. 
  Tree 
  93, 
  a 
  Lombard 
  plum 
  

   14 
  feet 
  high, 
  and 
  tree 
  94, 
  a 
  botan 
  plum 
  10 
  feet 
  high, 
  were 
  both 
  moder- 
  

   ately 
  infested 
  with 
  the 
  scale. 
  Tree 
  loi, 
  a 
  seckel 
  pear 
  9 
  feet 
  high 
  

   and 
  tree 
  114, 
  a 
  seckel 
  pear 
  12 
  feet 
  high, 
  were 
  both 
  very 
  badly 
  infested 
  

   with 
  the 
  scale. 
  The 
  spraying 
  was 
  done 
  under 
  conditions 
  identical 
  

   with 
  the 
  preceding. 
  Trees 
  93 
  and 
  94 
  were 
  sprayed 
  very 
  thoroughly 
  

   and 
  possibly 
  may 
  have 
  received 
  more 
  oil 
  than 
  the 
  others. 
  

  

  Ap. 
  19. 
  The 
  petroleum 
  is 
  very 
  apparent 
  on 
  trees 
  93, 
  94, 
  loi 
  and 
  

   114, 
  which 
  were 
  well 
  covered. 
  The 
  buds 
  are 
  starting 
  on 
  tree 
  loi. 
  

   The 
  condition 
  of 
  tree 
  114 
  at 
  this 
  time 
  is 
  shown 
  on 
  pi. 
  6. 
  

  

  May 
  II. 
  Tree 
  93 
  is 
  retarded 
  considerably 
  and 
  has 
  relatively 
  few 
  leaves 
  

   and 
  blossoms 
  ( 
  pi. 
  7). 
  Tree 
  94 
  is 
  killed 
  back 
  to 
  the 
  limbs 
  about 
  

   one 
  third 
  of 
  an 
  inch 
  in 
  diameter. 
  The 
  buds 
  are 
  just 
  starting. 
  Tree 
  

   loi 
  is 
  very 
  backward, 
  the 
  leaves 
  and 
  blossoms 
  are 
  just 
  starting. 
  

   Tree 
  114 
  has 
  only 
  a 
  i^^^ 
  leaves 
  appearing 
  at 
  the 
  tips 
  of 
  the 
  twigs. 
  For 
  

   a 
  photograph 
  of 
  tree 
  loi, 
  taken 
  May 
  12, 
  see 
  pi. 
  9. 
  

  

  May 
  14. 
  The 
  leaves 
  of 
  tree 
  93 
  are 
  much 
  thinner 
  and 
  more 
  backward 
  

   than 
  on 
  adjacent 
  trees. 
  There 
  are 
  few 
  blossoms. 
  Only 
  a 
  few 
  buds 
  are 
  

   starting 
  on 
  tree 
  94. 
  All 
  the 
  smaller 
  limbs 
  are 
  killed 
  back. 
  Only 
  a 
  few 
  

   leaves 
  and 
  blossoms 
  are 
  starting 
  at 
  the 
  tips 
  of 
  the 
  branches 
  of 
  tree 
  10 
  1. 
  

   A 
  few 
  leaves 
  are 
  pardy 
  out 
  at 
  the 
  tips 
  of 
  the 
  branches 
  and 
  but 
  few 
  blos- 
  

   soms 
  occur 
  on 
  tree 
  114. 
  

  

  May 
  28. 
  The 
  leaves 
  are 
  out 
  considerably 
  on 
  tree 
  93, 
  but 
  the 
  foliage 
  

   is 
  still 
  much 
  thinner 
  than 
  on 
  other 
  trees. 
  The 
  oil 
  is 
  very 
  apparent 
  on 
  the 
  

   trunk 
  and 
  limbs. 
  Tree 
  94 
  has 
  developed 
  one 
  weak 
  leaf. 
  Some 
  twigs 
  

   are 
  still 
  green 
  beneath 
  the 
  outer 
  bark. 
  There 
  are 
  a 
  very 
  few 
  pale, 
  under- 
  

   sized 
  leaves 
  on 
  the 
  tips 
  of 
  the 
  branches 
  and 
  a 
  few 
  leafless 
  limbs 
  on 
  tree 
  

  

  lOI. 
  

  

  June 
  20. 
  The 
  leaves 
  are 
  much 
  thinner 
  on 
  tree 
  93 
  than 
  on 
  others 
  adja- 
  

   cent. 
  The 
  lateral 
  buds 
  have 
  suffered 
  most. 
  The 
  petroleum 
  is 
  very 
  evident 
  

   on 
  the 
  bark. 
  Tree 
  94 
  is 
  dead. 
  Tree 
  loi 
  has 
  only 
  a 
  few 
  bunches 
  of 
  pale 
  

   green 
  leaves 
  on 
  four 
  limbs 
  and 
  on 
  the 
  suckers. 
  Many 
  of 
  the 
  lateral 
  

   buds 
  on 
  tree 
  114 
  are 
  killed. 
  The 
  shoots 
  are 
  growing 
  well 
  but 
  the 
  

   foliage 
  is 
  thin. 
  Adventitious 
  buds 
  are 
  developing. 
  

  

  July 
  2. 
  Trees 
  93, 
  loi, 
  114 
  have 
  a 
  few 
  living 
  young 
  scales. 
  The 
  

   condition 
  of 
  tree 
  93 
  is 
  represented 
  on 
  pi. 
  8, 
  which 
  should 
  be 
  compared 
  

   with 
  the 
  other 
  figure, 
  showing 
  the 
  condition 
  of 
  a 
  companion 
  tree. 
  

  

  