CHAPTER IV 



DISEASES OF GREENHOUSE SWEET PEAS 



Recent investigations have shown 

 that failures with greenhouse sweet peas 

 may be readily accounted for. Sickness 

 and death, not considering accidental 

 death, both in plants as in animals, are due 

 either to insects or to certain definite forms 

 of parasitic plant life, also known as germs 

 or microbes. Sweet peas need plenty of 

 air and sunshine and a cool climate. 

 These conditions are far from being satis- 

 fied in the greenhouse. Plants, like ani- 

 mals, when placed in unnatural surround- 

 ings, become a ready prey to disease. 

 Sweet peas under greenhouse conditions 

 are forced to grow in an unnatural way. 



The parasitic fungi which attack sweet 



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