﻿THE 
  GRAPE-BERRY 
  MOTH. 
  

  

  45 
  

  

  that 
  of 
  the 
  first 
  brood. 
  (See 
  Tables 
  IV 
  and 
  XII.) 
  The 
  larval 
  stage 
  

   of 
  this 
  brood 
  is 
  also 
  longer 
  than 
  that 
  of 
  the 
  first 
  brood, 
  the 
  average 
  

   being 
  22 
  days 
  for 
  the 
  first 
  brood 
  of 
  larvae 
  as 
  against 
  40 
  days 
  for 
  the 
  

   larvae 
  of 
  the 
  second 
  brood. 
  The 
  larvae 
  of 
  the 
  second 
  brood 
  com- 
  

   mence 
  to 
  leave 
  the 
  fruit 
  about 
  the 
  middle 
  of 
  September. 
  The 
  

   maximum 
  number 
  of 
  larvae 
  leave 
  the 
  fruit 
  during 
  the 
  last 
  week 
  in 
  

   September 
  and 
  the 
  first 
  10 
  days 
  in 
  October. 
  By 
  October 
  15 
  the 
  

   number 
  of 
  larvae 
  found 
  in 
  the 
  fruit 
  upon 
  the 
  vines 
  is 
  very 
  small. 
  By 
  

   this 
  date 
  practically 
  all 
  of 
  them 
  have 
  dropped 
  to 
  the 
  ground 
  and 
  

   formed 
  pupal 
  cases 
  on 
  the 
  small 
  percentage 
  of 
  grape 
  leaves 
  that 
  

   have 
  fallen 
  prematurely 
  from 
  the 
  vines. 
  Rarely 
  is 
  a 
  pupal 
  case 
  

   of 
  this 
  second 
  brood 
  found 
  on 
  the 
  leaves 
  attached 
  to 
  the 
  vines. 
  On 
  

  

  JUNE 
  

  

  5 
  10 
  15 
  20 
  25 
  

  

  JULY 
  

  

  5 
  10 
  15 
  20 
  25 
  

  

  AUGU5T 
  

  

  5 
  10 
  15 
  20 
  25 
  

  

  5EPTEMBER 
  

  

  5 
  10 
  15 
  20 
  25 
  

  

  DCTDBER 
  

  

  5 
  10 
  15 
  20 
  25 
  

  

  NOVEMBER 
  

  

  5 
  10 
  15 
  20 
  25 
  

  

  of 
  spring 
  brcod 
  ornofhs 
  

  

  of 
  crap 
  

  

  harve 
  

  

  ting 
  

  

  h<itchinc 
  cf 
  

  

  irst 
  

  

  brood 
  

  

  Uir"ai 
  

  

  brood 
  \iirjai 
  

  

  erner 
  

  

  (jence 
  

  

  of 
  

  

  first 
  

  

  brcod 
  of 
  

  

  rroths 
  

  

  t'lcomincj 
  

   raoe 
  

  

  penod 
  

  

  04>ition 
  

  

  oj 
  a 
  

  

  vine 
  

  

  hat 
  

  

  eooncl 
  br^od 
  

  

  Is 
  rvaj 
  

  

  second 
  

  

  brcodlarvEe 
  

  

  Fig. 
  15.— 
  Seasonal 
  history 
  of 
  the 
  grape-berry 
  moth 
  as 
  observed 
  in 
  1909, 
  at 
  North 
  East, 
  Pa. 
  (Original.) 
  

  

  the 
  moist 
  leaves 
  on 
  the 
  ground 
  beneath 
  the 
  vines 
  the 
  second-brood 
  

   arvse 
  and 
  also 
  a 
  small 
  percentage 
  of 
  the 
  first 
  brood 
  make 
  their 
  

   cocoons 
  and 
  pass 
  the 
  winter 
  as 
  pupse. 
  

  

  PARASITIC 
  ENEMIES. 
  

  

  Detailed 
  studies 
  of 
  the 
  habits 
  and 
  life 
  history 
  of 
  the 
  grape-berry 
  

   moth 
  during 
  the 
  past 
  few 
  years 
  have 
  shown 
  that 
  this 
  insect 
  is 
  beset 
  

   with 
  a 
  large 
  number 
  of 
  hymenopterous 
  parasites. 
  Previous 
  to 
  the 
  

   study 
  of 
  the 
  habits 
  of 
  this 
  pest 
  made 
  by 
  Prof. 
  M. 
  V. 
  Slingerland 
  in 
  

   the 
  vineyards 
  of 
  Chautauqua 
  County, 
  N. 
  Y., 
  the 
  only 
  record 
  of 
  

   attack 
  by 
  parasites 
  found 
  in 
  the 
  literature 
  on 
  this 
  subject 
  is 
  made 
  by 
  

   Dr. 
  O. 
  V. 
  Riley 
  in 
  L869. 
  Two 
  maggots 
  were 
  found 
  by 
  him 
  destroying 
  

  

  