SPRAYING 209 



Fungicides. These are poisons used to 

 control fungous pests. As previously 

 stated, some parasitic fungi live on the sur- 

 face of the leaves and stems and are there- 

 fore easily controlled. An example of this 

 is the sweet pea mildew. Other fungi, and 

 these are by far in the majority, are those 

 which live parasitically in the tissue of the 

 host, and therefore cannot be reached. 

 Fungicides are only helpful in preventing 

 entrance of the parasite in the host. Fun- 

 gicides are ineffective in controlling insect 

 pests, as are insecticides in controlling 

 fungous pests. 



(a) Bordeaux Mixture. This is the 

 standard fungicide, especially valuable in 

 controlling the sweet pea anthracnose. 

 The strength used should be 3 lb. of cop- 

 per sulphate, also known as blue stone, 4 

 lb. lime, and 50 gallons of water. The 

 easiest way to prepare it is to dissolve thor- 



