﻿104 
  

  

  DECIDUOUS 
  FRUIT 
  INSECTS 
  AND 
  INSECTICIDES. 
  

  

  SPRAYING 
  EXPERIMENTS 
  FOR 
  THE 
  DESTRUCTION 
  OF 
  THE 
  EGG 
  MASSES. 
  

  

  EXPERIMENTS 
  AT 
  ESPANOLA, 
  N. 
  MEX. 
  

  

  The 
  work 
  at 
  Espanola, 
  N. 
  Mex., 
  was 
  conducted 
  in 
  the 
  apple 
  

   orchard 
  of 
  Mr. 
  Henry 
  L. 
  Pollard. 
  The 
  orchard 
  consisted 
  of 
  14-year- 
  

   old 
  trees 
  in 
  fair 
  condition. 
  For 
  the 
  spraying 
  a 
  barrel 
  outfit 
  was 
  used 
  

   and 
  the 
  pressure 
  maintained 
  ranged 
  from 
  about 
  75 
  to 
  100 
  pounds. 
  

   The 
  number 
  of 
  trees 
  in 
  each 
  of 
  the 
  plats 
  is 
  shown 
  as 
  follows: 
  Plat 
  I, 
  

   21; 
  Plat 
  II, 
  22; 
  Plat 
  III, 
  14; 
  Plat 
  IV, 
  22; 
  Plat 
  V, 
  22; 
  Plat 
  VI, 
  6. 
  

   The 
  days 
  upon 
  which 
  the 
  sprays 
  were 
  applied 
  were 
  clear 
  and 
  quite 
  

   cool. 
  The 
  results 
  of 
  the 
  experiments 
  are 
  shown 
  in 
  the 
  following 
  

   table 
  : 
  

  

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

   Espanola, 
  N. 
  Mex., 
  1911-12. 
  

  

  Plat 
  

   No. 
  

  

  Treatment. 
  

  

  Num- 
  

   ber 
  of 
  

   count 
  

   trees. 
  

  

  Total 
  

   num- 
  

   ber 
  of 
  

  

  egg 
  

   masses 
  

  

  ob- 
  

   served. 
  

  

  Number 
  

   of 
  egg 
  

   masses 
  

  

  hatched. 
  

  

  Number 
  

  

  of 
  egg 
  

  

  masses 
  

  

  un- 
  

  

  hatched. 
  

  

  Percentage 
  of 
  egg 
  

   masses- 
  

  

  Hatched. 
  

  

  Un- 
  

   hatched. 
  

  

  I 
  

  

  II 
  

  

  III 
  

   IV 
  

  

  V 
  

  

  VI 
  

   VII 
  

  

  Commercial 
  lime-sulphur 
  solution 
  

   at 
  1 
  gallon 
  to 
  8 
  gallons 
  water 
  

  

  6 
  

  

  6 
  

   6 
  

  

  6 
  

  

  6 
  

  

  6 
  

  

  6 
  

  

  265 
  

  

  277 
  

   310 
  

  

  285 
  

  

  252 
  

  

  272 
  

   250 
  

  

  263 
  

  

  276 
  

   21 
  

  

  285 
  

  

  251 
  

  

  16 
  

   250 
  

  

  2 
  

  

  1 
  

  

  289 
  

  

  

  

  1 
  

  

  256 
  

   

  

  99.24 
  

  

  99.63 
  

  

  6.77 
  

  

  100.00 
  

  

  99.60 
  

  

  5.88 
  

   100.00 
  

  

  0.76 
  

  

  .37 
  

   93.23 
  

  

  

  

  .40 
  

  

  94.12 
  

   

  

  Commercial 
  lime-sulphur 
  solution 
  

   at 
  1 
  gallon 
  to 
  10 
  gallons 
  water 
  on 
  

   December 
  14, 
  1911 
  

  

  Miscible 
  oil 
  at 
  1 
  gallon 
  to 
  15 
  gallons 
  

   water 
  on 
  December 
  14, 
  1911 
  

  

  Commercial 
  lime-sulphur 
  solution 
  

   at 
  1 
  gallon 
  to 
  9 
  gallons 
  water 
  on 
  

   Februrary 
  17, 
  1912 
  

  

  Commercial 
  lime-sulphur 
  solution 
  

   at 
  1 
  gallon 
  to 
  7 
  gallons 
  water 
  on 
  

   Februrary 
  17, 
  1912 
  

  

  Miscible 
  oil 
  at 
  1 
  gallon 
  to 
  12 
  gal- 
  

   lons 
  water 
  on 
  February 
  17, 
  1912. 
  

  

  

  As 
  will 
  be 
  noted, 
  the 
  trees 
  sprayed 
  with 
  miscible 
  oil 
  showed 
  good 
  

   results 
  from 
  the 
  spraying. 
  The 
  spraying 
  of 
  Plat 
  III 
  with 
  the 
  oil 
  at 
  

   the 
  rate 
  of 
  1 
  gallon 
  to 
  15 
  gallons 
  of 
  water 
  prevented 
  93.23 
  per 
  cent 
  of 
  

   the 
  eggs 
  from 
  hatching, 
  and 
  Plat 
  VI, 
  upon 
  which 
  the 
  oil 
  was 
  used 
  at 
  

   the 
  rate 
  of 
  1 
  gallon 
  to 
  12 
  gallons 
  of 
  water, 
  showed 
  a 
  benefit 
  of 
  94.12 
  

   per 
  cent 
  in 
  favor 
  of 
  the 
  spraying 
  as 
  compared 
  with 
  the 
  checks. 
  It 
  

   should 
  also 
  be 
  noted 
  that 
  all 
  egg 
  masses 
  on 
  the 
  unsprayed 
  trees 
  

   hatched. 
  The 
  commercial 
  lime-sulphur 
  solutions 
  gave 
  little 
  or 
  no 
  

   beneficial 
  results 
  for 
  the 
  treatment. 
  On 
  Plat 
  IV 
  practically 
  all 
  the 
  

   eggs 
  hatched, 
  and 
  on 
  Plats 
  I, 
  II, 
  and 
  V 
  there 
  was 
  only 
  a 
  benefit 
  

   of 
  0.76, 
  0.37, 
  and 
  0.40 
  per 
  cent, 
  respectively, 
  from 
  the 
  treatment 
  as 
  

   compared 
  with 
  the 
  check 
  trees, 
  upon 
  which 
  all 
  the 
  eggs 
  hatched. 
  

  

  