9 



leaves of this plant are very tender and easily "burned" by 

 Paris green or Loudon purple. A mixture of one pound 

 Paris green to 250 gallons of water should be used on peach 

 trees, and that only when the leaves are young. Apple trees 

 should be sprayed just after the flowers have fallen. Small 

 fruits and vegetables are not easily injured, if at all, by 

 Paris green. 



London Purple is about as good as Paris green as an in- 

 secticide in many cases, and has this advantage, that it is much 

 cheaper, costing about fifteen cents per pound, and is also a 

 much finer powder and hence remains suspended in water 

 much longer. It is to be used in the same way and in the 

 same proportions as Paris green. 



Hellebore (white) is a powder poison made from a plant. 

 It kills both by being eaten and by contact. It can be used 

 as a powder to be dusted on to the plant either full strength 

 or diluted with flour, or as a liquid, one pound Hellebore to 

 40 gallons of water, to be sprayed on the plant. It costs 

 about twenty-five cents per pound. It is used less exten- 

 sively than Paris green or Loudon purple, but is especially 

 excellent in destroying the currant worm. 



Whiie Arsenic is not to be used when Paris green or Lon- 

 don purple can be had, since it is dangerous to have about 

 and is apt to burn the leaves. 



EXTERNAL POISONS. 



Pyreihrum is a powder made from the flowers of a 

 plant and is very poisonous to insects, but is perfectly harm- 

 less to man and domestic animals. It kills insects by con- 

 tact, and can be most successfully used as a powder to be 

 dusted by means of a bellows or other powder dusting ma- 

 chine. Pyrethrum is hard to obtain pure or at least in a 

 fresh condition. It loses its strength by standing, and 

 should be kept well corked. It may be used as a spray 

 in the proportion of one pound of Pyrethrum to 40 gallons 



