CONTENTS 



PAGE 



Plants affected 3 



Inoculations on hawthorn 5 



Inoculations on strawberry 6 



Inoculations on rose 7 



Inoculations on Japanese quince 8 



Inoculations on Photinia 8 



Summary of suscepts 9 



Etiology 10 



Cultural reactions of Bacillus amylovorus 10 



Strains of the organism 11 



Production of toxins 14 



Production of enzyrr es 19 



Carbohydrases 21 



Sucrase, or invertase 21 



Maltase 22 



Amylase 22 



Inulase 23 



Pectinase 23 



Cellulase 24 



Glucosidases 25 



Amygdalase 25 



Arbutase 26 



Protease 27 



Trypsin 27 



Summary on enzymes 27 



Longevity of the organism 27 



Mode of entrance into blossoms 29 



Leaf invasion 33 



Rate of migration in the suscept 35 



Epiphytology 37. 



Dissemination of the organism 37 



Relation of pollination and age of blossoms, to infection 40 



Relation of temperature to rate of migration 45 



General discussion and conclusions 46 



Summary : 48 



References 49 



