﻿THE 
  FRUIT-TREE 
  LEAF-ROLLER. 
  

  

  103 
  

  

  EXPERIMENTAL 
  TESTS 
  FOR 
  THE 
  DESTRUCTION 
  OF 
  THE 
  EGGS. 
  

  

  Many 
  laboratory 
  tests 
  were 
  made 
  for 
  the 
  destruction 
  of 
  the 
  eggs. 
  

   Only 
  egg 
  masses 
  deposited 
  on 
  twigs 
  were 
  used, 
  and 
  these 
  twigs 
  were 
  

   dipped 
  in 
  the 
  various 
  mixtures 
  employed. 
  After 
  treatment 
  the 
  

   masses 
  were 
  kept 
  in 
  separate 
  jars. 
  The 
  results 
  of 
  the 
  test 
  are 
  shown 
  

   in 
  Table 
  III. 
  

  

  Table 
  III.— 
  Tests 
  of 
  sprays 
  for 
  the 
  destruction 
  of 
  eggs 
  of 
  the 
  fruit-tree 
  leaf-roller. 
  

  

  No. 
  

   of 
  

   ex- 
  

   peri- 
  

   ment. 
  

  

  Material 
  used. 
  

  

  Date 
  of 
  

   applica- 
  

   tion, 
  1912. 
  

  

  Number 
  

  

  of 
  egg 
  

  

  masses 
  

  

  treated. 
  

  

  Number 
  

  

  of 
  egg 
  

  

  masses 
  

  

  un- 
  

  

  hatched. 
  

  

  Number 
  

   of 
  egg 
  

   masses 
  

  

  hatched. 
  

  

  Remarks. 
  

  

  1 
  

  

  Miscibleoil 
  (1:12) 
  

  

  Jan. 
  3 
  

  

  ...do 
  

  

  ...do 
  

  

  .do... 
  

  

  10 
  

   10 
  

   10 
  

   5 
  

   10 
  

  

  10 
  

   10 
  

   10 
  

   5 
  

   9 
  

  

  

   

  

  

  2 
  

   3 
  

  

  Miscible 
  oil 
  (1:15) 
  

  

  Miscibleoil 
  (1:20) 
  

  

  Miscibleoil 
  (1:10) 
  

  

  

  4 
  

  

  

  

  5 
  

  

  25 
  per 
  cent 
  kerosene 
  emul- 
  

   sion. 
  

  

  20 
  per 
  cent 
  kerosene 
  emul- 
  

   sion. 
  

  

  25 
  per 
  cent 
  crude 
  petro- 
  

   leum 
  emulsion. 
  

  

  20 
  per 
  cent 
  crude 
  petro- 
  

   leum 
  emulsion. 
  

  

  8 
  per 
  cent 
  distillate-oil 
  

   emulsion. 
  

  

  5 
  per 
  cent 
  distillate-oil 
  

   emulsion. 
  

  

  Commercial 
  lime-sulphur 
  

   (1:8). 
  

  

  Commercial 
  lime-sulphur 
  

   (1:9). 
  

  

  Commercial 
  lime-sulphur 
  

   (1:10). 
  

  

  Commercial 
  lime-sulphur 
  

   (1:11). 
  

  

  Commercial 
  lime-sulphur 
  

   (1:12). 
  

  

  Check— 
  untreated 
  (caged). 
  

  

  Miscible 
  oil 
  (1:12) 
  

  

  ...do.... 
  

  

  1 
  

  

  3 
  eggs 
  in 
  mass 
  hatched. 
  

  

  6 
  

  

  ...do.... 
  

  

  10 
  

  

  10 
  

  

  

  

  

  7 
  

   8 
  

   9 
  

   10 
  

   11 
  

  

  ...do.... 
  

  

  ...do 
  

  

  ...do.... 
  

   ...do.... 
  

   ...do.... 
  

  

  5 
  

   5 
  

   5 
  

   5 
  

   10 
  

  

  5 
  

   4 
  

   5 
  

   

   

  

  

   1 
  

   

   5 
  

   10 
  

  

  12 
  eggs 
  in 
  mass 
  hatched. 
  

  

  Most 
  all 
  the 
  eggs 
  hatched. 
  

   Practically 
  all 
  eggs 
  hatched. 
  

  

  12 
  

  

  ...do.... 
  

  

  5 
  

  

  

  

  5 
  

  

  Do. 
  

  

  13 
  

  

  ...do.... 
  

  

  5 
  

  

  

  

  5 
  

  

  Do. 
  

  

  14 
  

  

  ...do.... 
  

  

  5 
  

  

  

  

  5 
  

  

  Do. 
  

  

  15 
  

  

  16 
  

   17 
  

  

  ...do.... 
  

  

  ...do.... 
  

   Mar. 
  5 
  

  

  ...do 
  

  

  ...do.... 
  

   ...do.... 
  

  

  5 
  

  

  5 
  

   15 
  

   15 
  

   15 
  

   10 
  

  

  

  

  

   15 
  

   14 
  

   15 
  

   10 
  

  

  5 
  

  

  5 
  

   

   1 
  

   

   

  

  Do. 
  

  

  All 
  egg 
  masses 
  hatched 
  well. 
  

  

  18 
  

   19 
  

   20 
  

  

  Miscibleoil 
  (1:15) 
  

  

  Miscible 
  oil 
  (1:18) 
  

  

  25 
  per 
  cent 
  kerosene 
  emul- 
  

  

  Only 
  1 
  egg 
  hatched. 
  

  

  21 
  

  

  22 
  

  

  23 
  

  

  24 
  

   25 
  

  

  20 
  per 
  cent 
  kerosene 
  emul- 
  

   sion. 
  

  

  25 
  per 
  cent 
  crude 
  petro- 
  

   leum 
  emulsion. 
  

  

  10 
  per 
  cent 
  distillate-oil 
  

   emulsion. 
  

  

  Check— 
  untreated 
  (caged). 
  

  

  Miscibleoil 
  (1:12) 
  

  

  ...do.... 
  

  

  ...do 
  

  

  ...do... 
  

  

  ...do.... 
  

   Apr. 
  14 
  

   ...do 
  

  

  ...do.... 
  

   ...do 
  

  

  10 
  

  

  9 
  

  

  10 
  

  

  10 
  

   86 
  

   122 
  

  

  25 
  

   113 
  

  

  9 
  

  

  7 
  

  

  10 
  

  

  

   84 
  

   119 
  

  

  

   

  

  1 
  

  

  2 
  

  

  

  

  10 
  

   2 
  

   3 
  

  

  25 
  

   113 
  

  

  6 
  eggs 
  in 
  mass 
  hatched. 
  

  

  7 
  eggs 
  in 
  2 
  masses 
  hatched. 
  

  

  All 
  eggs 
  hatched 
  well. 
  

  

  26 
  

  

  27 
  

   28 
  

  

  Miscible 
  oil 
  (1:15) 
  

  

  Whitewash 
  

  

  Check— 
  untreated 
  (caged). 
  

  

  7 
  eggs 
  in 
  1 
  mass 
  hatched; 
  about 
  

  

  one-fourth 
  total 
  eggs 
  in 
  2 
  

  

  masses 
  hatched. 
  

   Practically 
  all 
  eggs 
  hatched. 
  

   107 
  masses 
  hatched 
  well; 
  about 
  

  

  one-half 
  total 
  eggs 
  hatched 
  in 
  

  

  6 
  masses, 
  

  

  It 
  will 
  be 
  noted 
  that 
  the 
  miscible 
  oil 
  ranging 
  in 
  strength 
  from 
  1:10 
  

   to 
  1:20 
  gave 
  the 
  best 
  results. 
  The 
  crude-petroleum 
  kerosene 
  and 
  

   10 
  per 
  cent 
  distillate-oil 
  emulsions 
  ranked 
  second 
  in 
  effectiveness. 
  

   Commercial 
  lime-sulphur 
  solution 
  was 
  found 
  to 
  be 
  ineffective, 
  as 
  was 
  

   whitewash. 
  

  

  