Plant Sanitation. 



398 



The heating pipes of green houses are frequently painted with flour of 

 sulphur made into a paste with water for the production of fumes, which act 

 to prevent various diseases. Fumes from burning sulphur may be used to 

 disinfect empty greenhouses, storage houses, and outbuildings. 



Caution — Fumes from burning sulphur are destructive to plant life and 

 should never be used to disinfect inclosures containing live plants or fresh fruits 

 and vegetables, as they will kill them wholly or in spots. 



Corrosive Sublimate. — Corrosive sublimate (mercuric chlorid) is used at the 

 rate of one part to 1,000 parts of water to disinfect the knife or other tools used in 

 cutting out pear-blight. Convenient-si/ed tablets of this substance can be purchased 

 at a drug store and kept in a bottle. One of these tablets may be added to a bottle 

 containing the required quantity of water (usually a pint), and a sponge or cloth 

 saturated with this solution may be used to wipe the tool afcer each cut. It 

 is also advisable to disinfect in this way the wound made by the removal of 

 the blighted wood. 



Caution. — Taken internally, corrosive sublimate is a deadly poison and 

 should be handled as such. — U- S, Department of Agriculture, Farmers' Bulletin, 

 No. 243. 



