924 Wart Disease of Potatoes in Great Britain, [feb., 



potatoes were found, though in only a few cases were the 

 field crops affected. Wart disease has also spread beyond this 

 area in patches among the parishes that lie round it. Thus, 

 a few cases have appeared in Warwickshire as far south as 

 Kenilworth and as far east as Rugby ; two parishes in 

 Leicestershire are affected; a few cases occur in Derbyshire 

 and West Nottinghamshire in the neighbourhood of Mans- 

 field ; and a few parishes in the West Riding of Yorkshire, 

 on the borders of Derbyshire and Cheshire, have been 

 attacked. Westwards of the affected area the disease has 

 spread in patches into Wales, appearing in the Counties of 

 Brecon, Cardigan, Carmarthen, Carnarvon, Denbigh, Flint, 

 Glamorgan, and Merioneth. 



The Board's Inspectors have examined a large number of 

 parishes in Gloucester, Warwick, Leicester, Nottingham, 

 Lincoln, and the West Riding of York, adjoining the infected 

 area, without finding any trace of the disease. 



W art disease has also spread northward beyond the infected 

 area in patches. Cases have been found in Lancashire (north 

 of the Ribble), in Cumberland, east Dumfriesshire, in north- 

 west* Ayrshire, and in two small areas, one including Clack- 

 mannan, south-west Perth, east Stirling, and south-west 

 Fife, and the other, central Fife and Kinross. It appeared 

 also in the neighbourhood of Edinburgh. In nearly every 

 case the disease is confined to allotments and gardens and the 

 field crops are untouched. 



An examination of the map of Great Britain shows that 

 outside the affected area and the isolated patches there are 

 large and important districts under potatoes where the disease 

 is unknown. Growers outside the area would be well advised 

 to procure their seed from unaffected districts, but those inside 

 can with safety buy potatoes locally or from other parts of 

 the area, provided that they ascertain that the potatoes were 

 grown on a farm where the disease does not exist. 



Great care must be taken not to apply manure made from 

 diseased potatoes to arable land. If the manure is contam- 

 inated disease will appear, no matter how carefully seed may 

 be chosen. It is probable that disease introduced into the soil 

 by manure may infect potatoes planted several years. after the 

 manure has been applied. 



