﻿THE 
  GRAPE-BEERY 
  MOTH. 
  

  

  55 
  

  

  The 
  variations 
  in 
  the 
  formulas 
  were 
  made 
  to 
  ascertain, 
  if 
  possible, 
  

   the 
  value 
  of 
  arsenate 
  of 
  lead 
  as 
  against 
  arsenite 
  of 
  lime 
  in 
  the 
  control 
  

   of 
  this 
  insect. 
  The 
  resin-fish-oil 
  was 
  added 
  on 
  some 
  plats 
  and 
  with- 
  

   held 
  on 
  others 
  to 
  determine 
  its 
  value 
  as 
  an 
  adhesive 
  in 
  making 
  the 
  

   spray 
  stick 
  to 
  the 
  grape 
  berries. 
  The 
  variation 
  in 
  number 
  of 
  appli- 
  

   cations 
  was 
  made 
  to 
  ascertain 
  if 
  applications 
  made 
  before 
  the 
  blossom- 
  

   ing 
  of 
  the 
  grape 
  were 
  of 
  greater 
  value 
  than 
  those 
  made 
  after 
  blossom- 
  

   ing. 
  The 
  application 
  on 
  June 
  19 
  was 
  made 
  when 
  the 
  blossom 
  clusters 
  

   were 
  well 
  developed, 
  but 
  a 
  few 
  

   days 
  before 
  actual 
  blossoming 
  

   (see 
  fig. 
  20). 
  The 
  application 
  on 
  

   July 
  8 
  was 
  made 
  after 
  blossoming 
  

   when 
  the 
  berries 
  were 
  about 
  the 
  

   size 
  of 
  buckshot 
  (PL 
  V, 
  fig. 
  1). 
  

   At 
  this 
  stage 
  of 
  development 
  the 
  

   berries 
  stand 
  some 
  distance 
  apart 
  

   and 
  the 
  spray 
  can 
  be 
  forced 
  

   through 
  the 
  cluster, 
  so 
  as 
  to 
  cover 
  

   all 
  of 
  the 
  berries 
  . 
  The 
  application 
  

   July 
  27 
  was 
  made 
  for 
  the 
  purpose 
  

   of 
  covering 
  the 
  berries 
  to 
  protect 
  

   them 
  from 
  the 
  entrance 
  of 
  larvae 
  

   of 
  the 
  second 
  brood. 
  

  

  In 
  all 
  of 
  these 
  applications 
  

   the 
  work 
  was 
  quite 
  thorough, 
  and 
  

   with 
  the 
  exception 
  of 
  the 
  third 
  

   application 
  most 
  of 
  the 
  clusters 
  

   were 
  well 
  covered 
  by 
  the 
  spray. 
  

  

  When 
  the 
  third 
  application 
  Was 
  FlG 
  - 
  20 
  -- 
  Sta 
  g 
  e 
  of 
  development 
  of 
  grape 
  blossom 
  clus- 
  

  

  , 
  , 
  , 
  ter 
  at 
  which 
  poison-spray 
  application 
  should 
  be 
  made 
  

  

  made 
  the 
  foliage 
  had 
  become 
  against 
  early 
  hatching 
  larvae 
  of 
  the 
  grape-berry 
  moth 
  

  

  rather 
  dense, 
  making 
  it 
  more 
  dif- 
  which 
  infest 
  the 
  blossom 
  clusters 
  - 
  (0riginaL) 
  

   ficult 
  to 
  reach 
  the 
  clusters, 
  and 
  at 
  the 
  same 
  time 
  the 
  berries 
  had 
  

   increased 
  in 
  size, 
  forming 
  a 
  somewhat 
  compact 
  cluster. 
  These 
  con- 
  

   ditions 
  made 
  it 
  increasingly 
  difficult 
  to 
  force 
  the 
  spray 
  in 
  among 
  the 
  

   berries. 
  Furthermore, 
  too 
  much 
  poison 
  forced 
  into 
  the 
  clusters 
  in 
  

   this 
  condition 
  is 
  undesirable, 
  since 
  some 
  of 
  it 
  is 
  likely 
  to 
  be 
  present 
  

   in 
  the 
  cluster 
  when 
  the 
  fruit 
  is 
  ripe 
  and 
  thus 
  render 
  it 
  undesirable 
  for 
  

   table 
  use. 
  

  

  During 
  the 
  season 
  four 
  counts 
  were 
  made 
  of 
  infested 
  berries 
  on 
  25 
  

   vinos 
  in 
  all 
  of 
  the 
  plats. 
  Table 
  XXIII 
  shows 
  the 
  increase 
  in 
  infestation: 
  

  

  