﻿32 
  

  

  DECIDUOUS 
  FKUIT 
  INSECTS 
  AND 
  INSECTICIDES. 
  

  

  Table 
  II 
  gives 
  a 
  record 
  of 
  oviposition 
  by 
  spring-emerging 
  moths 
  

   secured 
  during 
  the 
  season 
  of 
  1909. 
  This 
  table 
  gives 
  the 
  number 
  of 
  

   days 
  between 
  emergence 
  of 
  the 
  moth 
  and 
  the 
  first 
  oviposition 
  and 
  

   also 
  the 
  number 
  of 
  days 
  between. 
  emergence 
  and 
  the 
  last 
  oviposition. 
  

   The 
  minimum 
  period 
  before 
  first 
  oviposition 
  was 
  4 
  days; 
  the 
  average 
  

   6.6 
  days; 
  the 
  maximum 
  13 
  days. 
  The 
  average 
  period 
  between 
  the 
  

   first 
  and 
  last 
  ovipositions 
  was 
  7.1 
  days. 
  The 
  longest 
  period 
  between 
  

   emergence 
  and 
  the 
  last 
  oviposition 
  was 
  18 
  days. 
  

  

  Length 
  oj 
  life 
  oj 
  spring 
  brood 
  of 
  moths. 
  — 
  Records 
  from 
  our 
  rearing 
  

   cages 
  show 
  that 
  many 
  of 
  the 
  moths 
  will 
  live 
  in 
  confinement 
  for 
  a 
  

   number 
  of 
  days, 
  especially 
  when 
  food 
  in 
  the 
  form 
  of 
  honey 
  or 
  sweet- 
  

   ened 
  water 
  is 
  supplied. 
  Table 
  III 
  gives 
  the 
  length 
  of 
  life 
  of 
  76 
  

   moths, 
  showing 
  that 
  the 
  minimum 
  life 
  period 
  was 
  4 
  days, 
  the 
  average 
  

   12.9 
  days, 
  and 
  the 
  maximum 
  23 
  days. 
  The 
  average 
  length 
  of 
  life 
  of 
  

   the 
  moths 
  recorded 
  in 
  this 
  experiment 
  very 
  closely 
  approximates 
  

   that 
  of 
  the 
  moths 
  recorded 
  in 
  Table 
  II, 
  which 
  was 
  12.7 
  days. 
  

  

  Table 
  III. 
  — 
  Length 
  of 
  life 
  of 
  moths 
  of 
  the 
  spring 
  brood 
  of 
  the 
  grape-berry 
  moth 
  in 
  con- 
  

   finement, 
  with 
  food, 
  at 
  North 
  East, 
  Pa., 
  in 
  1909. 
  

  

  Number 
  of 
  

   moths. 
  

  

  Date- 
  

  

  Length 
  

   of 
  life. 
  

  

  Number 
  of 
  

   moths. 
  

  

  Date- 
  

  

  Length 
  

   of 
  life. 
  

  

  Emerged. 
  

  

  Dead. 
  

  

  Emerged. 
  

  

  Dead. 
  

  

  4. 
  

  

  June 
  19 
  

   ...do.... 
  

   ...do.... 
  

   ...do.... 
  

   ...do.... 
  

   June 
  20 
  

   ...do.... 
  

  

  July 
  3 
  

   July 
  6 
  

   July 
  7 
  

   July 
  8 
  

   July 
  9 
  

   June 
  29 
  

   July 
  1 
  

   July 
  3 
  

   July 
  9 
  

   July 
  8 
  

   July 
  10 
  

   July 
  12 
  

  

  Days. 
  

   14 
  

   17 
  

   18 
  

   19 
  

   20 
  

   9 
  

   11 
  

   13 
  

   19 
  

   15 
  

   17 
  

   19 
  

  

  3 
  

  

  June 
  23 
  

   June 
  24 
  

  

  ...do.... 
  

  

  ...do.... 
  

  

  ...do.... 
  

   July 
  4 
  

  

  ...do 
  

  

  ...do.... 
  

  

  ...do.... 
  

  

  July 
  16 
  

   July 
  2 
  

   July 
  7 
  

   July 
  9 
  

   July 
  11 
  

   July 
  12 
  

   July 
  14 
  

   July 
  15 
  

   July 
  16 
  

   July 
  17 
  

   July 
  24 
  

   July 
  26 
  

  

  Days. 
  

   23 
  

  

  8 
  

   13 
  

   15 
  

   17 
  

  

  8 
  

  

  10 
  

   11 
  

   12 
  

  

  4 
  

   11 
  

   13 
  

  

  4 
  

  

  4 
  

  

  2 
  

  

  1 
  

  

  6 
  

  

  10 
  

  

  i 
  

  

  4 
  

  

  5 
  

  

  2 
  

  

  1 
  

  

  1 
  

  

  8 
  

  

  2 
  

  

  6 
  

  

  1 
  

  

  ...do.... 
  

   ...do.... 
  

   June 
  23 
  

   ...do 
  

  

  3 
  

  

  July 
  13 
  

   ...do... 
  . 
  

  

  2 
  

  

  2 
  

  

  ...do 
  

  

  2 
  

  

  ...do 
  

  

  Total 
  number 
  of 
  moths 
  

  

  Length 
  of 
  life: 
  

  

  Average 
  days. 
  

  

  Maximum 
  do. 
  . 
  . 
  

  

  Minimum 
  do. 
  . 
  . 
  

  

  12. 
  

  

  FIRST 
  GENERATION. 
  

  

  Incubation 
  period 
  oj 
  first-brood 
  eggs. 
  — 
  Table 
  IV 
  gives 
  a 
  record 
  of 
  

   the 
  length 
  of 
  the 
  egg 
  stage 
  for 
  21 
  eggs 
  of 
  the 
  first 
  brood 
  deposited 
  

   on 
  grape 
  berries 
  in 
  the 
  field 
  rearing 
  cage. 
  The 
  minimum 
  length 
  of 
  

   the 
  egg 
  stage 
  for 
  this 
  number 
  of 
  eggs 
  was 
  4 
  days, 
  the 
  average 
  6 
  days, 
  

   and 
  the 
  maximum 
  8 
  days. 
  

  

  