﻿THE 
  GRAPE-BERK 
  Y 
  MOTH. 
  23 
  

  

  cage. 
  Their 
  position 
  could 
  be 
  located 
  only 
  after 
  an 
  extended 
  and 
  

   careful 
  search, 
  so 
  closely 
  did 
  their 
  coloration 
  harmonize 
  with 
  the 
  

   background 
  upon 
  which 
  they 
  were 
  at 
  rest. 
  Toward 
  evening 
  they 
  

   became 
  active, 
  flying 
  about 
  the 
  rearing 
  cage 
  and 
  among 
  the 
  foliage 
  of 
  

   the 
  vine, 
  and 
  at 
  this 
  time 
  of 
  day 
  oviposition 
  on 
  the 
  blossom 
  clusters 
  

   and 
  berries 
  doubtless 
  occurs. 
  At 
  no 
  time, 
  however, 
  were 
  the 
  females 
  

   observed 
  in 
  the 
  act 
  of 
  ovipositing. 
  Practically 
  all 
  of 
  the 
  egg 
  deposi- 
  

   tion 
  on 
  grape 
  berries 
  in 
  the 
  rearing 
  cages 
  occurred 
  at 
  night; 
  hence 
  

   there 
  is 
  no 
  doubt 
  that 
  the 
  moth 
  is 
  largely 
  nocturnal 
  in 
  its 
  activities. 
  

   It 
  has 
  been 
  observed 
  quite 
  frequently, 
  however, 
  that 
  in 
  the 
  vine- 
  

   yards 
  egg 
  deposition 
  is 
  much 
  heavier 
  upon 
  the 
  grape 
  clusters 
  that 
  are 
  

   enveloped 
  in 
  dense 
  foliage. 
  This 
  would 
  indicate 
  that 
  conditions 
  of 
  

   subdued 
  light 
  are 
  more 
  favorable 
  to 
  oviposition 
  than 
  are 
  exposed 
  

   positions. 
  

  

  HABITS 
  AND 
  CHARACTER 
  OF 
  INJURY 
  OF 
  THE 
  LARVA. 
  

  

  It 
  is 
  in 
  the 
  larval 
  or 
  caterpillar 
  stage 
  that 
  this 
  insect 
  is 
  injurious 
  

   to 
  the 
  grape, 
  and, 
  as 
  the 
  popular 
  name 
  of 
  the 
  insect 
  indicates, 
  the 
  

   berry 
  or 
  fruit 
  is 
  the 
  part 
  of 
  the 
  plant 
  which 
  it 
  attacks. 
  In 
  1868 
  

   Packard 
  recorded 
  the 
  larva 
  as 
  feeding 
  on 
  the 
  leaves, 
  but 
  the 
  next 
  

   year 
  he 
  corrected 
  this 
  error, 
  and 
  later 
  observations 
  by 
  entomologists 
  

   have 
  failed 
  to 
  confirm 
  this 
  habit. 
  The 
  first 
  larvas 
  to 
  hatch 
  are 
  from 
  

   eggs 
  which 
  are 
  laid 
  by 
  the 
  earliest 
  emerging 
  moths 
  in 
  spring 
  and 
  are 
  

   doubtless 
  deposited 
  on 
  the 
  unexpanded 
  blossom 
  buds 
  or 
  on 
  the 
  stems 
  of 
  

   the 
  blossom 
  clusters. 
  These 
  larvae 
  attack 
  the 
  blossoms 
  and 
  the 
  tiny 
  

   berries. 
  In 
  the 
  course 
  of 
  its 
  movements, 
  which 
  must 
  cover 
  the 
  entire 
  

   blossom 
  cluster, 
  the 
  larva 
  spins 
  a 
  silken 
  web. 
  This 
  web 
  binds 
  to 
  each 
  

   other 
  and 
  to 
  the 
  stem 
  the 
  dried 
  corollas, 
  stamens, 
  and 
  partly 
  devoured 
  

   berries, 
  forming 
  a 
  conspicuous 
  mass 
  (see 
  fig. 
  5) 
  . 
  Usually, 
  however, 
  

   these 
  webs 
  formed 
  during 
  the 
  blossoming 
  period 
  of 
  the 
  grape 
  are 
  

   not 
  very 
  numerous 
  except 
  in 
  those 
  portions 
  of 
  vineyards 
  where 
  

   the 
  infestation 
  is 
  very 
  heavy. 
  In 
  addition 
  to 
  attacking 
  the 
  blos- 
  

   soms 
  and 
  small 
  berries 
  of 
  the 
  young 
  grape 
  clusters 
  the 
  larva 
  some- 
  

   times 
  burrows 
  into 
  the 
  stem, 
  destroying 
  a 
  part 
  of 
  the 
  cluster 
  (see 
  

   PI. 
  V, 
  fig. 
  1). 
  As 
  the 
  berries 
  increase 
  in 
  size 
  the 
  small, 
  scale-like, 
  

   semitransparent 
  eggs 
  are 
  readily 
  found 
  upon 
  them. 
  The 
  portion 
  of 
  

   the 
  berry 
  at 
  which 
  the 
  larva 
  enters 
  takes 
  on 
  a 
  conspicuous 
  purple 
  

   color, 
  and 
  not 
  infrequently 
  the 
  infested 
  berries 
  crack 
  open 
  as 
  illus- 
  

   trated 
  in 
  Plate 
  V, 
  figure 
  2. 
  In 
  addition 
  to 
  destroying 
  the 
  berry 
  

   first 
  attacked, 
  the 
  larva 
  connects 
  it 
  to 
  an 
  adjacent 
  berry 
  by 
  silken 
  

   strands, 
  forming 
  a 
  tunnel 
  between 
  the 
  partly 
  injured 
  berry 
  and 
  the 
  

   sound 
  one. 
  This 
  forms 
  an 
  avenue 
  of 
  escape 
  for 
  the 
  larva 
  when 
  the 
  

   berry 
  firsl 
  attacked 
  is 
  so 
  badly 
  injured 
  that 
  it 
  breaks 
  away 
  from 
  the 
  

   stem 
  (see 
  PI. 
  Y. 
  fig. 
  2). 
  When 
  the 
  larva* 
  of 
  the 
  first 
  brood 
  have 
  

  

  