﻿SPRAYING 
  AGAINST 
  GRAPE 
  LEAF 
  HOPPER. 
  \) 
  

  

  This 
  shows 
  an 
  average 
  increase 
  in 
  weight 
  of 
  1.7 
  pounds 
  per 
  basket 
  

   for 
  fruit 
  from 
  the 
  sprayed 
  vines. 
  As 
  in 
  the 
  case 
  of 
  all 
  the 
  other 
  exper- 
  

   iments, 
  the 
  foliage 
  on 
  the 
  sprayed 
  vines 
  remained 
  green 
  and 
  healthy 
  

   throughout 
  the 
  season, 
  and 
  new 
  growth 
  of 
  canes 
  continued 
  to 
  be 
  made 
  

   for 
  a 
  longer 
  period 
  than 
  upon 
  the 
  unsprayed 
  vines. 
  

  

  USE 
  OF 
  COMBINED 
  CONTACT 
  AND 
  POISON 
  SPRAY. 
  

  

  In 
  addition 
  to 
  the 
  experiments 
  described, 
  in 
  which 
  the 
  spray 
  ingre- 
  

   dients 
  consisted 
  of 
  either 
  tobacco 
  extract 
  No. 
  I 
  and 
  water 
  or 
  tobacco 
  

   extract 
  No. 
  II 
  and 
  water, 
  other 
  experiments 
  were 
  made, 
  in 
  one 
  case 
  

   adding 
  the 
  tobacco 
  extract 
  No. 
  II 
  to 
  Bordeaux 
  mixture 
  and 
  fish-oil 
  

   soap. 
  In 
  this 
  experiment 
  about 
  two-thirds 
  of 
  an 
  acre 
  of 
  the 
  infested 
  

   vines 
  was 
  sprayed 
  with 
  the 
  Bordeaux, 
  fish-oil 
  soap, 
  and 
  tobacco 
  

   extract 
  No. 
  II 
  mixture, 
  and 
  about 
  one-third 
  of 
  an 
  acre 
  was 
  sprayed 
  

   with 
  tobacco 
  extract 
  No. 
  II 
  and 
  water. 
  So 
  far 
  as 
  could 
  be 
  observed 
  

   the 
  killing 
  effect 
  of 
  tobacco 
  extract 
  No. 
  II 
  upon 
  the 
  nymphs 
  when 
  

   mixed 
  with 
  the 
  Bordeaux 
  and 
  soap 
  was 
  in 
  no 
  way 
  lessened; 
  nor 
  

   was 
  any 
  injurious 
  effect 
  apparent 
  to 
  the 
  leaves 
  and 
  fruit 
  of 
  the 
  vines 
  

   sprayed 
  with 
  this 
  mixture. 
  The 
  ingredients 
  were 
  used 
  in 
  this 
  mixture 
  

   at 
  the 
  following 
  dilution: 
  Bordeaux 
  mixture, 
  3 
  pounds 
  lime, 
  3 
  

   pounds 
  copper 
  sulphate 
  to 
  50 
  gallons 
  of 
  water, 
  plus 
  2 
  pounds 
  of 
  fish- 
  

   oil 
  soap, 
  and 
  tobacco 
  extract 
  No. 
  II 
  at 
  a 
  dilution 
  of 
  1 
  to 
  1,500 
  parts 
  of 
  

   the 
  Bordeaux 
  mixture. 
  Tobacco 
  extract 
  No. 
  II 
  at 
  a 
  dilution 
  of 
  1 
  to 
  

   1,500 
  parts 
  water. 
  

  

  In 
  another 
  experiment 
  5 
  acres 
  of 
  vineyards 
  were 
  sprayed 
  with 
  a 
  

   mixture 
  of 
  Bordeaux, 
  arsenate 
  of 
  lead, 
  and 
  tobacco 
  extract 
  No. 
  I, 
  at 
  

   the 
  following 
  dilution, 
  3 
  pounds 
  of 
  lime, 
  3 
  pounds 
  of 
  copper 
  sulphate, 
  

   2 
  pounds 
  arsenate 
  of 
  lead 
  to 
  50 
  gallons 
  of 
  water 
  plus 
  tobacco 
  extract 
  

   No. 
  I, 
  1 
  to 
  150 
  parts 
  of 
  the 
  Bordeaux 
  mixture. 
  So 
  far 
  as 
  could 
  be 
  

   observed 
  the 
  killing 
  effect 
  of 
  the 
  tobacco 
  extract 
  upon 
  the 
  nymphs 
  

   was 
  not 
  lessened 
  in 
  this 
  mixture 
  nor 
  were 
  any 
  injurious 
  effects 
  from 
  

   this 
  mixture 
  observed 
  upon 
  the 
  foliage 
  and 
  fruit 
  of 
  the 
  vines. 
  The 
  

   object 
  of 
  adding 
  the 
  tobacco 
  ingredient 
  to 
  the 
  Bordeaux 
  and 
  the 
  

   arsenate 
  of 
  lead 
  mixtures 
  is 
  an 
  endeavor 
  to 
  reduce 
  the 
  number 
  of 
  

   applications 
  made 
  necessary 
  in 
  some 
  instances 
  to 
  control 
  the 
  several 
  

   insect 
  and 
  fungous 
  enemies 
  attacking 
  the 
  foliage 
  or 
  the 
  fruit 
  of 
  the 
  

   grapevine. 
  The 
  advisability 
  of 
  applying 
  the 
  tobacco 
  extracts 
  against 
  

   the 
  grape 
  leafhopper 
  with 
  Bordeaux 
  and 
  arsenate 
  of 
  lead 
  will 
  be 
  a 
  

   matter 
  for 
  the 
  individual 
  vinevardist 
  to 
  decide 
  after 
  he 
  has 
  made 
  a 
  

   thorough 
  examination 
  of 
  his 
  vineyard 
  to 
  determine 
  if 
  other 
  insects 
  

   are 
  present 
  in 
  numbers 
  sufficient 
  to 
  warrant 
  their 
  treatment. 
  The 
  

   insects 
  which 
  may 
  possibly 
  be 
  infesting 
  the 
  foliage 
  or 
  fruit 
  of 
  the 
  grape 
  

   at 
  the 
  time 
  of 
  treating 
  the 
  nymphs 
  of 
  the 
  grape 
  leafhopper 
  with 
  the 
  

   tobacco 
  extracts 
  are 
  the 
  grape 
  rootworm 
  and 
  the 
  grape 
  berry 
  moth. 
  

  

  The 
  second 
  poison 
  application 
  against 
  the 
  grape 
  rootworm 
  to 
  the 
  

   surface 
  of 
  the 
  Leaves 
  «»f 
  the 
  grape 
  is 
  usually 
  made 
  during 
  the 
  first 
  two 
  

  

  