SPRAYING 217 



which is to be destroyed, and the proper 

 ingredients used. To keep fungous pests 

 in check it is necessary to have the plant 

 covered with the fungicide all the time 

 infection is feared or suspected. It must 

 be remembered that spraying for fungi is 

 a form of insurance. It protects the plant 

 from becoming infected. However, when 

 the parasite penetrates the host, spraying 

 is of little value in saving the infected 

 plant although it will protect others which 

 are as yet healthy. It is essential that the 

 sweet pea grower be ever ready to spray 

 on time (fig. 46) . Sometimes the retarda- 

 tion of even a day may yield negative re- 

 sults. The timely destruction of one in- 

 sect, or of one spore, undoubtedly means 

 the destruction of countless generations of 

 these pests. 



Thoroughness is as important in spray- 

 ing as it is in everything else in life. Es- 



