﻿250 
  

  

  Chickens 
  eating 
  the 
  poisoned 
  grasshoppers 
  do 
  not 
  appear 
  to 
  be 
  

   affected. 
  The 
  bran 
  mash 
  loses 
  its 
  effect 
  as 
  soon 
  as 
  it 
  is 
  dry. 
  In 
  alfalfa 
  

   fields 
  about 
  240,000 
  grasshoppers 
  were 
  killed 
  per 
  acre 
  with 
  one 
  

   application. 
  Poison 
  for 
  this 
  experiment 
  was 
  scattered 
  broadcast 
  

   through 
  the 
  field, 
  using 
  4-5 
  lb. 
  to 
  the 
  acre 
  at 
  a 
  cost 
  of 
  not 
  over 
  Qd. 
  

   per 
  acre. 
  This 
  was 
  carried 
  out 
  in 
  a 
  field 
  where 
  the 
  alfalfa 
  was 
  fully 
  

   grown 
  ; 
  a 
  more 
  effective 
  means 
  is 
  the 
  mowing 
  of 
  the 
  field, 
  leaving 
  strips 
  

   of 
  standing 
  alfalfa 
  4-6 
  feet 
  wide 
  and 
  about 
  75 
  yards 
  apart. 
  The 
  

   grasshoppers 
  soon 
  collect 
  in 
  these 
  strips 
  and 
  are 
  thus 
  readily 
  poisoned 
  

   with 
  small 
  amounts 
  of 
  the 
  bran 
  mash, 
  or 
  easily 
  caught 
  with 
  the 
  hopper 
  

   dozer. 
  By 
  these 
  means 
  a 
  grower 
  of 
  the 
  largest 
  crops 
  of 
  alfalfa 
  was 
  

   able 
  to 
  harvest 
  three 
  crops 
  before 
  the 
  first 
  of 
  August, 
  where 
  in 
  an 
  un- 
  

   treated 
  field, 
  kept 
  as 
  a 
  control 
  near 
  by, 
  only 
  one 
  crop 
  was 
  harvested 
  

   in 
  the 
  same 
  time. 
  

  

  Experiments 
  were 
  made 
  to 
  determine 
  the 
  attractiveness 
  for 
  the 
  

   insects 
  of 
  baits 
  where 
  the 
  expensive 
  lemons 
  were 
  replaced 
  with 
  less 
  

   expensive 
  ingredients 
  such 
  as 
  anise 
  oil, 
  stale 
  beer, 
  or 
  vinegar, 
  or 
  left 
  

   out 
  altogether. 
  The 
  experiments 
  showed 
  that 
  the 
  insect 
  has 
  a 
  keen 
  

   sense 
  of 
  smell 
  and 
  is 
  easily 
  attracted 
  to 
  the 
  bait 
  put 
  out 
  for 
  it 
  ; 
  lemons 
  

   render 
  the 
  bait 
  26*5 
  per 
  cent, 
  more 
  effective 
  than 
  any 
  of 
  the 
  other 
  

   ingredients 
  tried. 
  

  

  BuKGEss 
  (A. 
  F.). 
  Outline 
  of 
  the 
  work 
  on 
  the 
  Gipsy 
  Moth 
  and 
  Brown- 
  

   tail 
  Moth 
  conducted 
  by 
  the 
  Bureau 
  of 
  Entomology, 
  U.S. 
  Department 
  

   of 
  Agriculture. 
  — 
  Jl. 
  Econ. 
  Entom., 
  Concord., 
  vii, 
  no. 
  1, 
  Feb. 
  1914, 
  

   pp. 
  83-87. 
  

  

  The 
  author 
  gives 
  an 
  account 
  of 
  the 
  methods 
  adopted 
  to 
  prevent 
  the 
  

   spread 
  of 
  the 
  gipsy 
  moth 
  (Lymantria 
  dispar) 
  and 
  brown-tail 
  moth 
  

   (Euproctis 
  chrysorrhea) 
  from 
  the 
  infested 
  region 
  in 
  New 
  England 
  to 
  

   other 
  parts 
  of 
  the 
  United 
  States. 
  The 
  experimental 
  work 
  con- 
  

   sists 
  of 
  the 
  study 
  of 
  the 
  life-history 
  and 
  habits 
  of 
  parasitic 
  and 
  

   predaceous 
  enemies, 
  with 
  a 
  view 
  to 
  propagating 
  them 
  in 
  the 
  infested 
  

   areas 
  ; 
  field 
  observation 
  work 
  is 
  done 
  during 
  the 
  summer 
  and 
  autumn, 
  

   and 
  records 
  kept 
  of 
  the 
  increase 
  or 
  decrease 
  of 
  the 
  species 
  in 
  a 
  given 
  

   area, 
  and 
  of 
  the 
  defoliation 
  on 
  the 
  trees 
  concerned 
  ; 
  food-plant 
  work 
  

   is 
  carried 
  on 
  in 
  the 
  laboratory, 
  caterpillars 
  of 
  the 
  gipsy 
  m.oth 
  being 
  fed 
  

   on 
  selected 
  food-plants, 
  and 
  records 
  kept 
  of 
  their 
  preferences 
  for 
  

   different 
  plants 
  ; 
  factors 
  concerned 
  with 
  spread 
  of 
  the 
  insect 
  are 
  in- 
  

   vestigated, 
  such 
  as 
  wind, 
  temperature, 
  etc. 
  Investigations 
  on 
  the 
  

   wilt 
  disease, 
  which 
  attacks 
  the 
  gipsy 
  moth 
  caterpillars 
  and 
  destroys 
  

   large 
  numbers 
  of 
  them, 
  are 
  being 
  conducted. 
  Many 
  trees 
  that 
  have 
  

   been 
  defoliated 
  by 
  the 
  gipsy 
  moth 
  are 
  attacked 
  by 
  bark 
  borers 
  

   (Scolytidae) 
  ; 
  oak 
  trees 
  suffer 
  seriously 
  in 
  this 
  respect 
  : 
  attempts 
  

   are 
  being 
  made 
  to 
  determine 
  whether 
  such 
  pests 
  can 
  be 
  controlled 
  

   economically. 
  

  

  Work 
  is 
  being 
  done 
  in 
  co-operation 
  with 
  the 
  Forest 
  Service 
  to 
  

   determine 
  whether 
  different 
  species 
  of 
  timber 
  trees 
  are 
  more 
  or 
  less 
  

   resistant 
  to 
  moth 
  attacks. 
  The 
  territory 
  infested 
  by 
  the 
  gipsy 
  moth 
  

   and 
  brown-tail 
  moth 
  has 
  been 
  placed 
  under 
  quarantine, 
  and 
  regulations 
  

   have 
  been 
  made 
  providing 
  for 
  the 
  inspection 
  of 
  forest 
  and 
  nursery 
  

   stock 
  that 
  is 
  shipped 
  from 
  the 
  infested 
  territory 
  to 
  other 
  parts 
  of 
  the 
  

   United 
  States. 
  The 
  country 
  adjoining 
  the 
  infested 
  territory 
  is 
  under 
  

   inspection. 
  

  

  