VINE DISEASES. 151 



Remedies. — If the disease be present, spraying with 

 dihite Bordeaux Mixture (Formula No. 21) is the best 

 that can be done ; apphcation should be made at intervals 

 of ten days until the grapes are the size of peas, when 

 Bordeaux Mixture should be replaced by an ammoniacal 

 solution of carbonate of copper (Formula No. 22), which 

 will not spot and disfigure the fruit. 



Diseased leaves and fruit should be collected and 

 burned, and it is very important that such diseased por- 

 tions, should not be allowed to fall and remain through the 

 winter on the ground or in neglected cornere, otherwise the 

 sclerotia present in the tissues will produce spores the 

 following spring and infect the young growth. 



Downy or False Mildew (Plasmopara viticola).— 

 This fungoid disease is of American origin, and " makes 

 its appearance," says Dr. W. G. Smith in his " Diseases 

 of Plants " (Longmans and Co.), " in early summer s/& 

 white patches on the under surfaces of the leaves, some- 

 times also on the stalks and fruit. In the course of the 

 summer the leaves show brown spots, and dry up." It 

 seems that the disease is most prevalent in moitst weather, 

 and hence it naturally follows that vineries which are not 

 properly ventilated will provide suitable conditions for the 

 development of the fungus. 



Eemedie!-'. — Spray the foliage, as soon as the berries have 

 formed, every ten daj^ wdth the Ammoniacal Solution of 

 Carbonate of Copper (Formula No. 22), or with the 

 Wobum Bordeaux Emulsion (Formula No. 21). These 

 remedies must not be applied after the berries begin to 

 colour. 



Mildew (Uncinula spiralis). — Vines grown under glass 

 and in the open air are often attacked by a form of 

 mildew peculiar to the vine, and as grape growers ought 

 to be able to recognise the fungus in order to deal 

 promptly with it, v/e give full details of its life history, 

 with the best remedies for its eradication. If allowed to 



