VEGETABLE DISEASES. 107 



kills them. At first the leaves are attacked, and then 

 the bulbs. 



Remedy. — The only remedy known is to pull up and 

 burn all infected plants. 



Parsnip Mildew (Plasmopara nivea).— The roots of 

 parsnips are sometimes attacked by the foregoing fungus, 

 which causes the former to become putrescent and unfit 

 for food or sale. 



Eemedt. — All roots that show signs of going rotten 

 should be promptly burnt, to destroy the fungus and pre- 

 vent the latter spreading another season. 



Pea Mildew (Ei-^-siphe Martii).— A fungus, or mil- 

 dew, which attacks peas very badly in some seasons, and 

 practically ruins the crop. The fungus first turns the 

 leaves of a yellow tint, then coats the surface with a fine 

 white growth, similar to ordinary mildew. Soon after 

 this dense coating becomes dotted with small black bodies 

 containing the spores of the mildew. The disease is more 

 prevalent in very dry or very wet seasons. 



E.EMEDIES. — Spray with sulphide of potassium and water 

 (Formula 23) if the mildew attacks the f oh age only very 

 slightly; if badly, the best plan is to burn the plants. 



Pea Spot (Ascochyta pisi). — A fungoid disease which 

 attacks the pods of peas, causing pale spots to form on 

 them and making them more or less deformed in shape. 

 Not a serious disease. 



Remedies. — Spraying with the Woburn Bordeaux Emul- 

 sion (Formula 21) if very prevalent; gathering and' burn- 

 ing the infested pods in isolated cases. 



Radish Mildew (Peronospora parasitica). — Not a 

 serious disease. It attacks the foliage in the form of a 

 white mould or mildew. 



Remedy. — Spraying with a Sulphide of Potassium Solu- 

 tion (Formula 48). 



