2o8 DISEASES OF THE SWEET PEA 



kept under lock and key as they are poison- 

 ous to man and animals. 



Hellebore or white hellebore is some- 

 what less dangerous than the arsenicals. 

 However, it loses its insecticidal value by 

 being exposed to the air. It is a specific 

 against slugs in the greenhouse. 



(b) Contact Poisons. All the tobacco 

 or nicotine products sold principally as ex- 

 tracts or powders belong to this class. A 

 common brand much used is the prepara- 

 tion known as "Black leaf 40," diluted 1 

 part to 700 or 800 of water. An addition 

 of soap at the rate of two bars to each 100 

 gallons of the solution increases its effec- 

 tiveness by making it spread out better. 

 Aphine, Sulpho tobacco, and a number of 

 other products found on the markets are 

 usually valuable as contact poisons if prop- 

 erly tested out and guaranteed by the 

 dealers. 



