Symptoms 



with flowers of sulphur or spray with liver of 

 sulphur (7). 

 Crataegus. 



Foliage. — Leaves (and sometimes fruits) 

 swollen and bearing orange spots upon which 

 tufts of cup-Uke growths, at first flask-shaped, 

 later cylindrical, containing yeUow spores, 

 occur. Rust due to Gymnosporangium clavarii- 

 forme, which has Juniper as alternate host. 



Greyish-white growth on leaves and shoots, 

 which are somewhat dwarfed. Mildew due to 

 Podosphaera Oxyacanihae. 



YeUow spots on upper surface of leaves, due 

 to Pleospora Oxyacanihae. These are not suffi- 

 ciently serious to call for remedy. 

 Ceess. 



Stem. — ^The lower part of stem at ground- 

 level dies and the seedlings topple over. Thin 

 seeding, ventilation and soil sterilisation are 

 the best preventive measures. Caused by 

 Pythium De Baryanum. 



CUCTJMBEE. 



Stem. — The lower part becomes " cankered " 

 and the upper part wilts. Mycosphaerdla 

 citruUina. Destroy plants and avoid use of 

 soil again for cucumbers or melons. 



Foliage. — Whitish growths on leaf surface. 

 Mildew due to Erysiphe cichoracearum. Dust 

 with flowers of sulphur (7). 

 77 



