﻿40 
  THE 
  DISPERSION 
  OF 
  THE 
  GIPSY 
  MOTH. 
  

  

  During 
  the 
  period 
  from 
  1906 
  to 
  1909 
  a 
  large 
  extent 
  of 
  scouting 
  

   was 
  done 
  by 
  the 
  State 
  of 
  Massachusetts 
  in 
  the 
  territory 
  outside 
  of 
  

   the 
  area 
  known 
  to 
  be 
  infested, 
  and, 
  as 
  a 
  result, 
  44 
  new 
  towns 
  and 
  

   cities 
  were 
  found 
  infested. 
  Isolated 
  colonies 
  Avere 
  found 
  at 
  Green- 
  

   field, 
  at 
  Palmer, 
  at 
  Springfield, 
  and 
  at 
  Warren 
  during 
  the 
  scouting 
  

   operations, 
  but 
  all 
  of 
  them 
  have 
  since 
  been 
  exterminated. 
  In 
  New 
  

   Hampshire 
  scouting 
  work 
  was 
  carried 
  on 
  under 
  the 
  direction 
  of 
  

   Mr. 
  D. 
  M. 
  Rogers, 
  special 
  agent 
  of 
  the 
  Bureau 
  of 
  Entomology. 
  The 
  

   infested 
  area 
  was 
  found 
  to 
  have 
  greatly 
  increased. 
  Scouting 
  was 
  

   also 
  carried 
  on 
  in 
  Maine 
  and 
  Rhode 
  Island 
  and 
  showed 
  that 
  the 
  

   infested 
  area 
  was 
  increasing, 
  and 
  one 
  isolated 
  colony 
  was 
  found 
  in 
  

   Togus, 
  Me. 
  At 
  the 
  close 
  of 
  this 
  period 
  of 
  scouting 
  the 
  entire 
  area 
  

   of 
  infestation 
  covered 
  nearly 
  7,300 
  square 
  miles. 
  The 
  greater 
  part 
  

   of 
  the 
  spread 
  had 
  been 
  toward 
  the 
  northeast 
  and 
  northwest, 
  and 
  

   it 
  is 
  interesting 
  to 
  note 
  that 
  the 
  prevailing 
  winds 
  blew 
  in 
  these 
  di- 
  

   rections, 
  especially 
  from 
  the 
  southwest. 
  (See 
  map 
  1.) 
  

  

  During 
  the 
  period 
  from 
  1909 
  to 
  1912 
  the 
  infested 
  territory 
  has 
  

   continued 
  to 
  increase. 
  Nearly 
  all 
  the 
  scouting 
  work 
  has 
  been 
  done 
  

   by 
  agents 
  of 
  the 
  Bureau 
  of 
  Entomology, 
  although 
  a 
  small 
  force 
  has 
  

   been 
  employed 
  by 
  the 
  States 
  of 
  Maine, 
  Massachusetts, 
  and 
  Con- 
  

   necticut, 
  The 
  infested 
  territory 
  has 
  continued 
  to 
  increase 
  along 
  the 
  

   line 
  of 
  the 
  prevailing 
  winds, 
  as 
  is 
  shown 
  on 
  map 
  1 
  and 
  by 
  its 
  

   Avind 
  diagram. 
  In 
  the 
  fall 
  of 
  1909 
  an 
  isolated 
  colony 
  was 
  found 
  

   at 
  Wallingford, 
  Conn., 
  but 
  careful 
  scouting 
  for 
  miles 
  in 
  all 
  directions 
  

   has 
  failed 
  to 
  locate 
  other 
  infestations 
  in 
  that 
  part 
  of 
  the 
  State. 
  It 
  

   is 
  probable 
  that 
  egg 
  clusters 
  Avere 
  brought 
  to 
  Wallingford 
  on 
  market 
  

   boxes 
  or 
  in 
  packing 
  material. 
  The 
  thorough 
  treatment 
  Avhich 
  has 
  

   been 
  given 
  under 
  the 
  direction 
  of 
  the 
  State 
  entomologist, 
  Dr. 
  W. 
  E. 
  

   Britton, 
  and 
  his 
  assistant 
  has 
  reduced 
  the 
  colony 
  to 
  a 
  point 
  approach- 
  

   ing 
  extermination. 
  The 
  same 
  is 
  true 
  of 
  the 
  colony 
  at 
  Stonington, 
  

   Conn. 
  

  

  In 
  the 
  summer 
  of 
  1911 
  the 
  gipsy 
  moth 
  was 
  discoA 
  T 
  ered 
  on 
  an 
  estate 
  

   in 
  the 
  town 
  of 
  Lenox 
  in 
  the 
  western 
  part 
  of 
  Massachusetts, 
  and 
  

   scouting 
  Avork 
  has 
  resulted 
  in 
  locating 
  it 
  in 
  Stockbridge 
  and 
  Great 
  

   Barrington. 
  It 
  is 
  probable 
  that 
  in 
  Lenox 
  and 
  Stockbridge 
  the 
  in- 
  

   festation 
  resulted 
  from 
  the 
  receipt 
  of 
  a 
  carload 
  of 
  nursery 
  stock 
  

   (Pis. 
  XIV, 
  XV, 
  XVI) 
  which 
  was 
  shipped 
  by 
  the 
  Boston 
  Park 
  

   Department 
  about 
  1909 
  to 
  the 
  estate 
  where 
  the 
  infestation 
  Avas 
  found. 
  

   The 
  origin 
  of 
  the 
  Great 
  Barrington 
  infestation 
  is 
  obscure, 
  but 
  fur- 
  

   ther 
  scouting 
  of 
  the 
  town 
  may 
  uncoA^er 
  conditions 
  which 
  will 
  explain 
  

   the 
  reason. 
  The 
  colony 
  at 
  Togus, 
  Me., 
  has 
  been 
  exterminated, 
  no 
  

   specimens 
  having 
  been 
  found 
  since 
  1908. 
  

  

  As 
  a 
  result 
  of 
  the 
  scouting 
  operations 
  during 
  the 
  past 
  winter 
  it 
  

   is 
  shoAAm 
  that 
  10.900 
  square 
  miles 
  are 
  now 
  infested 
  Avith 
  the 
  gipsy 
  

   moth. 
  The 
  territory 
  AA 
  7 
  hich 
  is 
  noAv 
  badly 
  infested 
  is 
  Avell 
  outside 
  

  

  