ENEMIES AND DISEASES OF POULTRY 141 



Stai-csacre seed powder is made from the seed of a 

 species of larkspur that grows in Southern Europe. It is 

 a poisonous substance, and delphinin, a poisonous drug, is 

 made from this seed. When fine, this powder is a good 

 insecticide. 



Dry air-slaked lime makes an effective insect powder 

 on account of its extreme fineness. 



Road dust will answer as an insecticide when used 

 alone, provided it is very fine. It is also used as a 

 base to mix with finely ground powders to make insecti- 

 cides. To make sure that road dust is fine enough to 

 be valuable as an insecticide, it should be passed 

 through a very fine 

 sieve, similar to that 

 used by druggists for 

 separating the coarser 

 from the finer par- 

 ticles in a powder. 



Compound insect pow- 

 ders composed as fol- 

 lows will be found 

 effective: 



1. Fine road dust 

 that has been care- 

 fully sieved and mixed 

 with an equal quan- 

 tity of Pyrethrum 



powder. This will be very effective provided the Pyreth- 

 rum powder is pure and the road dust very fine. 



2. Equal parts of air-slaked lime, tobacco dust, and 

 fine dust from coal ashes. If very fine and dry, this 

 mixture will be suitable for dusting into nest boxes 

 or on the bodies of fowls. It may, however, adhere to 

 the bodies of the fowls and cause irritation. 



Liquid Insecticides. Liquid insecticides are more ef- 

 fective for application to the interior of poultry buildings 

 than powder insecticides, for the reason that they can be 

 sprayed into all the cracks and crevices. When 

 thoroughly applied, a good liquid insecticide will rid 



WHITE LEGHORNS 



