﻿552 
  

  

  oviposition. 
  Besides 
  counting 
  the 
  larvae 
  in 
  spring 
  and 
  the 
  injured 
  

   grapes 
  in 
  summer, 
  the 
  grape 
  yield 
  was 
  checked 
  in 
  the 
  same 
  treated 
  and 
  

   untreated 
  plots. 
  The 
  figures 
  work 
  out 
  at 
  an 
  increase 
  of 
  about 
  2,565 
  lb. 
  

   of 
  grapes 
  per 
  acre 
  in 
  the 
  case 
  of 
  the 
  treated 
  vineyards. 
  This 
  means 
  

   an 
  extra 
  four 
  casks 
  of 
  must, 
  at 
  least, 
  for 
  the 
  treated 
  grapes 
  were 
  larger 
  

   and 
  finer 
  than 
  the 
  others. 
  Taking 
  the 
  vineyard 
  as 
  a 
  whole, 
  it 
  was 
  

   found 
  that 
  treatment 
  about 
  doubled 
  the 
  output. 
  Careful 
  owners 
  

   of 
  small 
  vineyards 
  have 
  therefore 
  an 
  efficacious 
  method 
  of 
  control 
  at 
  

   their 
  disposal 
  and 
  the 
  owners 
  of 
  large 
  vineyards 
  can 
  also 
  profit 
  by 
  it 
  

   in 
  some 
  measure. 
  

  

  Degrully 
  (L.). 
  La 
  lutte 
  centre 
  les 
  insectes. 
  [Combating 
  insect 
  pests.] 
  

   — 
  Pr 
  ogres 
  Agric. 
  Vitic, 
  Montpellier, 
  xxxi, 
  no. 
  16, 
  19th 
  April 
  1914, 
  

   pp. 
  487-490. 
  

  

  In 
  vineyards, 
  both 
  the 
  vine 
  flea-beetle 
  (Haltica 
  ampelophaga) 
  

   and 
  the 
  leaf-roller 
  of 
  the 
  vine 
  {Sparganothis 
  pilleriana) 
  may 
  be 
  easily 
  

   controlled 
  by 
  arsenicals, 
  but 
  Clysia 
  amhiguella 
  and 
  Polychrosis 
  botrana 
  

   remain 
  difficult 
  to 
  combat. 
  The 
  use 
  of 
  arsenicals 
  is 
  Hmited 
  to 
  spring. 
  

   Once 
  the 
  grapes 
  are 
  formed, 
  nicotin 
  alone 
  can 
  be 
  used. 
  Summer 
  

   treatment 
  is 
  hampered 
  by 
  the 
  luxuriance 
  of 
  foHage 
  and 
  by 
  the 
  difficulty 
  

   of 
  determining 
  the 
  proper 
  moment 
  for 
  action. 
  According 
  to 
  many 
  

   workers 
  the 
  latter 
  coincides 
  with 
  the 
  period 
  of 
  flight, 
  but 
  this 
  is 
  some- 
  

   what 
  protracted, 
  so 
  that 
  a 
  proportion 
  of 
  insects 
  is 
  bound 
  to 
  escape 
  

   even 
  where 
  the 
  efficiency 
  of 
  the 
  insecticide 
  reaches 
  100 
  per 
  cent. 
  

   Haltica, 
  Clysia 
  and 
  the 
  leaf-roller 
  are 
  controlled 
  by 
  the 
  same 
  formulae, 
  

   which 
  are 
  as 
  follows 
  : 
  — 
  

  

  Arsenate 
  of 
  lead. 
  In 
  regions 
  with 
  a 
  damp 
  chmate, 
  about 
  3 
  oz. 
  of 
  

   arsenate 
  of 
  soda 
  should 
  be 
  allowed 
  to 
  every 
  6 
  gals, 
  of 
  spray, 
  while 
  

   in 
  the 
  South 
  of 
  France 
  2 
  oz. 
  will 
  suffice, 
  except 
  in 
  vineyards 
  where 
  

   grubs 
  are 
  found 
  at 
  the 
  close 
  of 
  the 
  season 
  or 
  where 
  pupae 
  are 
  abundant 
  

   under 
  the 
  bark. 
  In 
  every 
  22 
  gals, 
  of 
  water 
  the 
  two 
  formulae 
  contain 
  

   respectively 
  10 
  oz. 
  and 
  6Joz. 
  of 
  anhydrous 
  arsenate 
  of 
  soda 
  with 
  30 
  oz. 
  

   and 
  20 
  oz. 
  of 
  neutral 
  acetate 
  of 
  lead. 
  The 
  arsenate 
  is 
  dissolved 
  in 
  5^ 
  

   gals, 
  of 
  water 
  and 
  the 
  acetate 
  in 
  16-| 
  gals., 
  after 
  which 
  it 
  is 
  slowly 
  

   added 
  to 
  the 
  arsenate 
  solution. 
  Only 
  a 
  quantity 
  sufficient 
  for 
  the 
  day's 
  

   work 
  should 
  be 
  prepared, 
  freshly-made 
  sprays 
  being 
  fighter 
  and 
  of 
  

   more 
  " 
  sticking 
  " 
  power. 
  To 
  make 
  this 
  a 
  wetting 
  spray, 
  Gastine 
  

   has 
  suggested 
  the 
  following 
  modified 
  formula 
  : 
  A 
  soap 
  solution 
  is 
  

   made 
  by 
  dissolving 
  20 
  oz. 
  of 
  dry 
  white 
  soap 
  in 
  3 
  gals, 
  of 
  hot 
  water, 
  

   this 
  being 
  the 
  dose 
  for 
  22 
  gals, 
  of 
  spray. 
  Arsenate 
  of 
  soda 
  and 
  acetate 
  

   of 
  lead 
  are 
  made 
  up 
  in 
  separate 
  solutions 
  bulking 
  6 
  gals. 
  each. 
  After 
  

   the 
  acetate 
  solution 
  has 
  been 
  added 
  to 
  that 
  of 
  arsenate, 
  3 
  J 
  oz. 
  of 
  

   Solvay 
  carbonate 
  of 
  soda 
  (dissolved 
  in 
  a 
  httle 
  water) 
  are 
  added, 
  if 
  

   the 
  weaker 
  formula 
  given 
  above 
  is 
  being 
  employed. 
  For 
  the 
  strong 
  

   formula, 
  5 
  J 
  oz. 
  of 
  Solvay 
  carbonate 
  of 
  soda 
  are 
  necessary. 
  The 
  

   resulting 
  mixture 
  is 
  diluted 
  to 
  about 
  18 
  gals., 
  so 
  that 
  when 
  the 
  soap 
  

   solution 
  is 
  finally 
  added, 
  22 
  gals, 
  of 
  spray-solution 
  result. 
  

  

  Arsenate 
  of 
  lime. 
  This 
  is 
  very 
  efficient, 
  at 
  least 
  "against 
  Haltica 
  

   and 
  Sparganothis. 
  The 
  burns 
  it 
  is 
  sometimes 
  said 
  to 
  cause 
  are 
  usually 
  

   slight 
  in 
  character 
  and 
  without 
  influence 
  on 
  the 
  crop. 
  The 
  following 
  

   formula 
  is 
  given 
  : 
  Dissolve 
  1 
  lb. 
  of 
  anhydrous 
  arsenate 
  of 
  lead 
  in 
  10 
  

   gals, 
  of 
  water 
  ; 
  dissolve 
  13 
  oz. 
  of 
  sifted 
  lime 
  (fresh) 
  in 
  2 
  gals, 
  of 
  water 
  ; 
  

  

  