﻿RECENT 
  WORK 
  ON 
  THE 
  SAN 
  JOSE 
  SCALE 
  

   IN 
  ILLINOIS.* 
  

  

  {^Aspidiotus 
  perniciosus 
  Cotnsiock.) 
  

  

  The 
  work 
  of 
  this 
  office 
  on 
  the 
  San 
  Jose 
  scale 
  was 
  begun 
  in 
  Septem- 
  

   ber, 
  1896, 
  with 
  the 
  discovery 
  of 
  the 
  scale 
  in 
  Illinois, 
  and 
  an 
  article 
  on 
  

   the 
  subject 
  was 
  published 
  in 
  my 
  entomological 
  Report 
  for 
  1895 
  and 
  

   1896 
  under 
  the 
  title 
  of 
  "The 
  San 
  Jose 
  Scale 
  in 
  Illinois." 
  This 
  article 
  

   was 
  revised 
  in 
  printing 
  to 
  include 
  a 
  general 
  account 
  of 
  our 
  operations 
  

   up 
  to 
  October, 
  1897, 
  and 
  of 
  this 
  report 
  the 
  present 
  one 
  may 
  be 
  regarded 
  

   as 
  a 
  continuation. 
  The 
  work 
  here 
  described, 
  like 
  that 
  previously 
  re= 
  

   ported, 
  has 
  been 
  in 
  part 
  purely 
  practical 
  and 
  in 
  part 
  scientific. 
  It 
  has 
  

   included 
  a 
  continuation 
  of 
  the 
  search 
  for 
  infested 
  Illinois 
  localities 
  and 
  

   a 
  thoroughgoing 
  examination 
  of 
  those 
  detected, 
  as 
  begun 
  in 
  1896; 
  the 
  

   inspection 
  of 
  Illinois 
  nurseries 
  and 
  nursery 
  stock 
  as 
  a 
  basis 
  for 
  official 
  

   certificates 
  issued 
  to 
  nurserymen; 
  the 
  insecticide 
  treatment 
  of 
  infested 
  

   premises 
  in 
  Illinois, 
  undertaken 
  to 
  arrest 
  the 
  spread 
  of 
  the 
  scale 
  in 
  this 
  

   State; 
  the 
  collection, 
  study, 
  cultivation, 
  and 
  introduction, 
  into 
  orchards 
  

   of 
  two 
  fungus 
  parasites 
  of 
  this 
  scale; 
  field 
  experimentation 
  with 
  special 
  

   insecticides 
  and 
  insecticide 
  apparatus; 
  and 
  a 
  study 
  of 
  certain 
  minor 
  

   points 
  in 
  the 
  life 
  history 
  and 
  cecology 
  of 
  this 
  insect. 
  

  

  The 
  search 
  for 
  infested 
  Illinois 
  localities 
  has 
  resulted 
  in 
  the 
  dis- 
  

   covery 
  of 
  six 
  f 
  points 
  not 
  on 
  the 
  list 
  given 
  in 
  my 
  last 
  biennial 
  Report, 
  

   thus 
  making 
  twenty-five| 
  such 
  localities 
  now 
  known 
  in 
  Illinois. 
  A 
  con- 
  

   siderable 
  increase 
  of 
  the 
  area 
  known 
  to 
  be 
  infested 
  at 
  four 
  localities 
  

   already 
  reported 
  has 
  also 
  been 
  thus 
  made 
  out. 
  The 
  nursery 
  inspections, 
  

   forty-three 
  in 
  number, 
  made 
  by 
  my 
  Assistants 
  have 
  covered 
  thirty-four 
  

   Illinois 
  nurseries, 
  besides 
  one 
  in 
  an 
  adjacent 
  state 
  examined 
  by 
  special 
  

   request 
  and 
  arrangement. 
  The 
  cost 
  of 
  these 
  inspections, 
  as 
  paid 
  by 
  

   nurserymen, 
  ranged 
  from 
  $1.50 
  to 
  $31.73, 
  and 
  averaged 
  $10.43 
  each, 
  of 
  

  

  * 
  Printed 
  also 
  as 
  Bulletin 
  No. 
  56 
  of 
  the 
  Illinois 
  Agricultural 
  Experiment 
  Station, 
  

   in 
  August, 
  1899. 
  

  

  f 
  Now 
  eleven. 
  % 
  Now 
  thirty. 
  

  

  