﻿162 
  

  

  Sahille 
  (E.). 
  Sobre 
  el 
  gusano 
  de 
  la 
  peras 
  y 
  manzanas. 
  [The 
  pear 
  

   and 
  apple 
  worm.] 
  — 
  Revista 
  de 
  la 
  Asociacion 
  Rural 
  del 
  Uruguay, 
  

   Montevideo, 
  Aug.-Sept. 
  1913, 
  pp. 
  359-362. 
  

  

  The 
  author 
  states 
  that 
  in 
  Uruguay 
  the 
  moths 
  of 
  Cydia 
  (Carpocapsa) 
  

   pomonella 
  are 
  best 
  destroyed 
  by 
  bonfires 
  lit 
  in 
  the 
  evening 
  around 
  

   pear 
  and 
  apple 
  trees 
  when 
  in 
  blossom 
  ; 
  or 
  again, 
  a 
  large 
  box 
  provided 
  

   with 
  apertures, 
  containing 
  a 
  light 
  and 
  smeared 
  inside 
  with 
  honey 
  or 
  

   syrup, 
  makes 
  an 
  effective 
  trap. 
  Against 
  the 
  grubs 
  the 
  author 
  recom- 
  

   mends 
  preventive 
  spraying. 
  As 
  Paris 
  green 
  is 
  expensive, 
  the 
  use 
  

   of 
  Scheele's 
  green 
  (copper 
  arsenate) 
  is 
  suggested. 
  As 
  a 
  poison 
  it 
  is 
  

   equal 
  to 
  Paris 
  green, 
  and 
  costs 
  only 
  half 
  the 
  price 
  ; 
  being 
  in 
  extremely 
  

   fine 
  powder 
  it 
  very 
  easily 
  remains 
  in 
  suspension 
  in 
  liquids. 
  

  

  Jack 
  (R. 
  W.). 
  Two 
  Ladybirds 
  Injurious 
  to 
  Potato 
  Plants. 
  — 
  Rhodesia 
  

   Agric. 
  JL, 
  Salisbury, 
  xi, 
  no. 
  1, 
  Oct. 
  1913, 
  pp. 
  77-82, 
  1 
  pi. 
  

  

  Ladybirds 
  are 
  in 
  general 
  of 
  great 
  value 
  to 
  farmers, 
  constituting 
  a 
  

   powerful 
  control 
  against 
  scale-insects 
  and 
  plant 
  hce. 
  There 
  is, 
  how- 
  

   ever, 
  one 
  genus 
  of 
  ladybirds, 
  Epilachna, 
  of 
  which 
  all 
  the 
  known 
  species 
  

   are 
  exclusively 
  plant-feeders. 
  In 
  Southern 
  Rhodesia 
  two 
  species, 
  

   E. 
  dregei 
  and 
  E. 
  hirta, 
  normally 
  feeding 
  on 
  certain 
  wild 
  solanaceous 
  

   plants, 
  have 
  caused 
  serious 
  damage 
  to 
  potato 
  crops. 
  The 
  eggs 
  are 
  

   laid 
  in 
  clumps, 
  varying 
  from 
  four 
  or 
  five 
  eggs 
  to 
  upwards 
  of 
  thirty, 
  

   on 
  the 
  under 
  surfaces 
  of 
  the 
  leaves. 
  Here 
  the 
  larvae 
  hatch 
  and 
  feed 
  

   on 
  the 
  softer 
  portions 
  of 
  the 
  leaves, 
  as 
  do 
  also 
  the 
  adults. 
  The 
  latter 
  

   live 
  over 
  the 
  winter 
  and 
  probably 
  egg-laying 
  commences 
  as 
  

   soon 
  as 
  the 
  warm 
  weather 
  approaches. 
  It 
  is 
  probable 
  that 
  only 
  

   two 
  broods 
  develop 
  on 
  the 
  potato 
  crop 
  in 
  Rhodesia, 
  the 
  first 
  being 
  

   laid 
  in 
  December, 
  the 
  adults 
  appearing 
  about 
  the 
  end 
  of 
  January 
  ; 
  

   the 
  second 
  brood 
  maturing 
  early 
  in 
  March. 
  If 
  food 
  is 
  available 
  in 
  

   November 
  three 
  broods 
  can 
  doubtless 
  mature. 
  There 
  is 
  no 
  doubt 
  

   that 
  potato 
  diseases 
  are 
  spread 
  and 
  assisted 
  by 
  these 
  insects. 
  

  

  Turkeys, 
  when 
  experienced 
  in 
  the 
  work, 
  are 
  reported 
  to 
  be 
  very 
  

   effective 
  in 
  destroying 
  this 
  pest 
  in 
  the 
  field. 
  Much 
  good 
  can 
  be 
  done 
  

   by 
  kilhng 
  the 
  beetles 
  by 
  hand. 
  On 
  a 
  larger 
  scale 
  spraying 
  with 
  an 
  

   arsenical 
  compound 
  is 
  the 
  most 
  effective 
  remedy. 
  The 
  arsenic 
  may 
  

   take 
  the 
  form 
  of 
  arsenate 
  of 
  lead, 
  3 
  lb. 
  to 
  50 
  gals, 
  of 
  water 
  ; 
  or 
  Paris 
  

   green 
  1 
  lb., 
  quick 
  or 
  fresh 
  water-slaked 
  lime 
  2 
  lb., 
  water 
  160 
  gals. 
  ; 
  

   or 
  arsenite 
  of 
  Hme, 
  which 
  is 
  by 
  far 
  the 
  cheapest 
  arsenical 
  spray 
  in 
  

   Rhodesia, 
  and 
  as 
  effective 
  as 
  the 
  others. 
  Arsenite 
  of 
  hme 
  can 
  be 
  

   prepared 
  from 
  arsenite 
  of 
  soda 
  and 
  quick 
  or 
  water-slaked 
  hme. 
  The 
  

   formula 
  is, 
  arsenite 
  of 
  soda 
  4 
  oz., 
  hme 
  11 
  lb., 
  and 
  water 
  50 
  gallons. 
  

   The 
  arsenite 
  of 
  soda 
  is 
  best 
  dissolved 
  in 
  a 
  httle 
  boihng 
  water 
  and 
  made 
  

   up 
  to 
  25 
  gallons 
  in 
  one 
  barrel. 
  The 
  hme 
  is 
  then 
  slowly 
  slaked 
  and 
  

   made 
  up 
  to 
  25 
  gallons 
  in 
  another 
  barrel. 
  The 
  arsenite 
  solution 
  can 
  now 
  

   be 
  added 
  to 
  the 
  hme 
  water 
  and 
  the 
  whole 
  stirred 
  thoroughly. 
  The 
  

   hme 
  solution 
  should 
  be 
  strained. 
  A 
  hundred 
  gallons 
  of 
  a 
  mixture 
  of 
  

   arsenate 
  of 
  lead 
  to 
  be 
  effective 
  costs 
  7s. 
  6d., 
  while 
  a 
  hundred 
  gallons 
  

   of 
  arsenite 
  of 
  hme 
  costs 
  only 
  8d. 
  This 
  latter 
  mixture 
  should 
  be 
  kept 
  

   stirred 
  during 
  use. 
  

  

  