﻿U. 
  S. 
  D. 
  A., 
  B. 
  E. 
  Bui. 
  11G, 
  Tart 
  V. 
  D. 
  F. 
  I. 
  I., 
  Issued 
  March 
  12. 
  1913. 
  

  

  PAPERS 
  ON 
  DECIDUOUS 
  FRUIT 
  INSECTS 
  AND 
  INSECTICIDES. 
  

  

  THE 
  FRUIT-TREE 
  LEAF-ROLLER. 
  

  

  (Archips 
  argyrospila 
  Walk.) 
  

  

  By 
  John 
  B. 
  Gill, 
  

   Entomological 
  Assistant. 
  

  

  INTRODUCTION. 
  

  

  Until 
  quite 
  recently 
  the 
  fruit-tree 
  leaf-roller 
  (Archips 
  argyrospila 
  

   Walk.) 
  has 
  been 
  looked 
  upon 
  as 
  an 
  insect 
  of 
  only 
  minor 
  importance 
  

   to 
  cultivated 
  crops. 
  During 
  the 
  past 
  few 
  years, 
  however, 
  it 
  has 
  

   become 
  unusually 
  abundant 
  and 
  has 
  caused 
  considerable 
  loss 
  to 
  fruit 
  

   growers 
  in 
  certain 
  sections, 
  notably 
  in 
  Colorado 
  and 
  New 
  Mexico 
  and 
  

   in 
  New 
  York 
  State. 
  The 
  most 
  serious 
  outbreaks 
  have 
  appeared 
  in 
  

   Colorado 
  in 
  Fremont, 
  Pueblo, 
  and 
  Montezuma 
  Counties, 
  and 
  in 
  New 
  

   Mexico 
  in 
  San 
  Juan 
  and 
  Rio 
  Arriba 
  Counties. 
  The 
  investigations, 
  

   detailed 
  in 
  this 
  paper, 
  have 
  been 
  confined 
  for 
  the 
  most 
  part 
  to 
  the 
  

   infestations 
  at 
  Canon 
  City, 
  Colo., 
  and 
  Espanola, 
  N. 
  Mex. 
  In 
  the 
  

   former 
  place 
  the 
  damage 
  has 
  been 
  large, 
  as 
  the 
  insect 
  has 
  appeared 
  in 
  

   serious 
  numbers 
  in 
  about 
  1,500 
  acres 
  of 
  bearing 
  orchards 
  in 
  what 
  is 
  

   locally 
  known 
  as 
  the 
  Lincoln 
  Park 
  section, 
  and 
  it 
  is 
  also 
  spreading 
  

   rapidly 
  into 
  adjacent 
  fruit 
  districts. 
  If 
  not 
  checked 
  the 
  amount 
  of 
  

   loss 
  that 
  will 
  be 
  occasioned 
  by 
  its 
  attacks 
  in 
  the 
  future 
  will 
  probably 
  

   be 
  much 
  greater 
  than 
  in 
  the 
  past. 
  At 
  Espanola, 
  N. 
  Mex., 
  a 
  com- 
  

   paratively 
  small 
  fruit 
  belt, 
  the 
  infestation 
  has 
  not 
  been 
  so 
  serious. 
  

   The 
  damage 
  incurred 
  by 
  the 
  leaf-roller 
  has 
  varied 
  from 
  25 
  to 
  90 
  per 
  

   cent 
  of 
  the 
  entire 
  fruit 
  crop, 
  depending 
  on 
  the 
  measures 
  of 
  control 
  

   adopted, 
  the 
  abundance 
  of 
  the 
  "worms," 
  and 
  the 
  kind 
  or 
  variety 
  of 
  

   fruit 
  attacked. 
  In 
  unsprayed. 
  orchards 
  the 
  writer 
  has 
  seen 
  the 
  entire 
  

   fruit 
  crop 
  ruined 
  by 
  the 
  larvse, 
  and 
  the 
  trees 
  completely 
  defoliated 
  

   so 
  that 
  not 
  a 
  green 
  leaf 
  could 
  be 
  noticed. 
  When 
  trees 
  are 
  so 
  defoli- 
  

   ated 
  it 
  is 
  hardly 
  possible 
  for 
  them 
  to 
  produce 
  fruit 
  buds 
  for 
  the 
  fol- 
  

   lowing 
  season. 
  

  

  In 
  speaking 
  of 
  the 
  appearance 
  of 
  the 
  fruit-tree 
  leaf-roller 
  in 
  New 
  

   York 
  Prof. 
  G. 
  W. 
  Ilerrick 
  says: 
  

  

  In 
  the 
  spring 
  of 
  1911 
  the 
  larva 
  of 
  this 
  insect 
  appeared 
  in 
  enormous 
  numbers 
  in 
  the 
  

   orchard 
  of 
  Mr. 
  W. 
  O. 
  Page 
  at 
  Bethany 
  Center, 
  N. 
  Y., 
  and 
  to 
  a 
  considerable 
  extent 
  in 
  

   neighboring 
  orchards. 
  Moreover, 
  the 
  apple 
  leaf-roller 
  was 
  not 
  confined 
  by 
  any 
  moans 
  

   to 
  a 
  small 
  and 
  limited 
  area, 
  but 
  the 
  larvie 
  were 
  found 
  in 
  many 
  orchards 
  of 
  New 
  York 
  

   in 
  varying 
  numbers. 
  

  

  91 
  

  

  