19 J GARDEN FOES. 



phosphate, as the sulphur in the one and the acid in the 

 other promotes the development of the disease. Cab- 

 bages ishould be raised in beds heavily dressed with lime. 



Cucumber and Melon Mildew (Plasmopara cub- 

 ensis). — This fungus attacks the under sides of the leaver 

 of cucumbers and allied plants in the form of a white 

 mould or mildew. It spreads rapidly, and consequently 

 soon spoils the crop. Not a very common disease. 



Remedies. — Where only a single leaf or so is attacked 

 remove and burn them. As a preventive, spray the 

 under sides of the leaves with the Woburn Bordeaux 

 Emulsion (Formula 21) or ordinary Bordeaux Mixture 

 (Formula 20). 



Cucumber Fruit Rot (aia>osporium lagenarium).— 

 A fungoid disease which attacks the ends of the fruits, 

 causing them to become rotten. The leaves and stems 

 are also liable to be attacked. 



PiBMEDY. — None is known. The only thing to do is to 

 cut off all diseased fruits and burn them. 



Cucumber-Leaf Spot (Cercospora melonis). — 

 Although this was first observed as recently as 1896 it has 

 spread so rapidly as to be at the present time the most 

 destructive parasite with which the cultivator of cucum- 

 bers and melons has to contend. Many market growers 

 have been obliged to give up the cultivation of the crops, 

 whilst others report a loss of £2,000 annually. The first 

 symptom is the appearance of pale green spots scattered 

 ybout on the surface of the leaves. These spots gradually 

 spread imtil they run together, and at the same time pass 

 through a grey to a brownish colour. This is the fruiting 

 stage of the fungus. If it be examined at this time with 

 a lens it is found to consist of a lot of fine, upright, brown 

 threads, each bearing a fruit or " conidium " at its tip. 

 These, conidia are the reproductive bodies, and can be 

 carried from disea;sed to healthy plants on currents of air, 



