﻿THE 
  FKUIT-TREE 
  LEAF-ROLLER. 
  

  

  105 
  

  

  EXPERIMENTS 
  AT 
  CANON 
  CITY, 
  COLO. 
  

  

  The 
  work 
  at 
  Canon 
  City, 
  Colo., 
  was 
  conducted 
  in 
  the 
  orchards 
  of 
  

   Mr. 
  E. 
  A. 
  Davis 
  and 
  Dr. 
  Allen 
  Bell. 
  In 
  the 
  Davis 
  orchard 
  14-year- 
  

   old 
  Ben 
  Davis 
  trees 
  were 
  sprayed, 
  and 
  in 
  the 
  Bell 
  orchard 
  the 
  varie- 
  

   ties 
  treated 
  consisted 
  of 
  Ben 
  Davis, 
  Winesap, 
  and 
  Colorado 
  Orange. 
  

   The 
  trees 
  in 
  the 
  Bell 
  orchard 
  were 
  sprayed 
  with 
  miscible 
  oil 
  at 
  the 
  

   strengths 
  of 
  1 
  gallon 
  to 
  12 
  gallons 
  of 
  water 
  and 
  1 
  gallon 
  to 
  15 
  gallons 
  

   of 
  water 
  and 
  with 
  20 
  per 
  cent 
  kerosene 
  emulsion, 
  but 
  unfortunately 
  

   the 
  material 
  was 
  not 
  at 
  all 
  thoroughly 
  applied, 
  and 
  no 
  conclusions 
  

   as 
  to 
  the 
  efficiency 
  of 
  the 
  sprays 
  can 
  be 
  drawn 
  from 
  the 
  results 
  

   obtained. 
  Duties 
  elsewhere 
  required 
  the 
  absence 
  of 
  the 
  writer 
  from 
  

   Canon 
  City 
  when 
  the 
  applications 
  were 
  made. 
  The 
  trees 
  in 
  the 
  

   Davis 
  orchard, 
  on 
  the 
  other 
  hand, 
  were 
  thoroughly 
  sprayed 
  with 
  a 
  

   gasoline-power 
  sprayer. 
  The 
  pressure 
  maintained 
  ranged 
  from 
  150 
  

   to 
  175 
  pounds. 
  At 
  the 
  time 
  of 
  the 
  application 
  the 
  buds 
  were 
  just 
  

   bursting 
  and 
  beginning 
  to 
  show 
  the 
  green. 
  The 
  results 
  are 
  shown 
  in 
  

   Table 
  V. 
  

  

  Table 
  V. 
  — 
  Spraying 
  experiments 
  for 
  destruction 
  of 
  egg 
  masses 
  of 
  the 
  fruit-tree 
  leaf-roller 
  , 
  

  

  Canon 
  City, 
  Colo., 
  J 
  912. 
  

  

  Plat 
  

   No. 
  

  

  Treatment. 
  

  

  Count 
  

   tree 
  

   No. 
  

  

  Total 
  

   number 
  

  

  of 
  egg 
  

  

  masses 
  

  

  observed. 
  

  

  Number 
  of 
  egg 
  

   masses- 
  

  

  Percentage 
  of 
  egg 
  

   masses- 
  

  

  Hatched. 
  

  

  Un- 
  

   hatched. 
  

  

  Hatched. 
  

  

  Un- 
  

   hatched. 
  

  

  I 
  

   II 
  

  

  Miscible 
  oil 
  at 
  1 
  gallon 
  to 
  15 
  gal- 
  

   lons 
  of 
  water 
  on 
  April 
  16, 
  1912. 
  

  

  1 
  

  

  2 
  

   3 
  

   4 
  

   5 
  

   6 
  

  

  1 
  

   2 
  

   3 
  

  

  184 
  

  

  128 
  

   116 
  

   135 
  

   176 
  

   110 
  

  

  4 
  

   4 
  

   6 
  

  

  8 
  

  

  179 
  

  

  124 
  

   112 
  

   129 
  

   168 
  

   104 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  849 
  33 
  

  

  816 
  

  

  3.88 
  

  

  96.12 
  

  

  155 
  | 
  155 
  

   185 
  | 
  184 
  

  

  178 
  178 
  

  

  

  

  1 
  

   

  

  

  

  

  

  

  

  

  

  

  518 
  j 
  517 
  

  

  1 
  

  

  99.80 
  

  

  0.20 
  

  

  It 
  will 
  be 
  noted 
  that 
  a 
  comparison 
  as 
  to 
  the 
  number 
  of 
  egg 
  masses 
  

   that 
  failed 
  to 
  hatch 
  between 
  the 
  trees 
  on 
  Plat 
  I, 
  sprayed 
  with 
  miscible 
  

   oil 
  at 
  the 
  rate 
  of 
  1 
  gallon 
  to 
  15 
  gallons 
  of 
  water, 
  and 
  Plat 
  II, 
  which 
  

   was 
  left 
  untreated, 
  shows 
  a 
  benefit 
  of 
  95.92 
  per 
  cent 
  in 
  favor 
  of 
  the 
  

   spraying. 
  

  

  At 
  Canon 
  City, 
  Colo., 
  no 
  experiments 
  were 
  performed 
  with 
  lime- 
  

   sulphur. 
  The 
  writer 
  had, 
  however, 
  an 
  opportunity 
  to 
  examine 
  sev- 
  

   eral 
  orchards 
  in 
  this 
  section 
  that 
  wore 
  sprayed 
  with 
  this 
  material 
  

   against 
  the 
  Howard 
  scale 
  (Aspidiotus 
  howardi 
  CklL). 
  The 
  lime- 
  

   sulphur 
  was 
  found 
  to 
  be 
  entirely 
  ineffective 
  in 
  destroying 
  the 
  eggs 
  

   of 
  the 
  leaf 
  -roller. 
  

  

  