15 



or less subject to scab, the following may be mentioned as being 

 particularly liable to attack wherever grown : 



Apples Pears 



Bismarck. Beurre Clairgeau. 



Cox 's Orange Pippin. Beurre D'Amanlis. 



Cox's Pomona. Doyenne du Cornice. 



Duchess's Favourite. Duchesse d'Angouleme. 



Ecklinville. Glou Morceau. 



Keswick Codlin. Pitmaston Duchess. 



King of the Pippins. Souvenir de Congress. 



Lord Grosvenor. Vicar of Winkfield. 



Lord Suffield. Williams Bon Chretien. 

 Quarrenden. 

 Warner's King. 

 Wellington. 

 Yellow Ingestre. 



The following varieties of apples are more or less resistant : 

 Beauty of Bath, Bramley's Seedling, Early Victoria, Grenadier, 

 Lane's Prince Albert, and Lord Derby. 



Measures of Control. These consist of cutting out in- 

 fected wood and spraying. 



1. Infected Wood. As it is from diseased shoots that the 

 scab starts afresh each year, it is worth making a determined 

 effort to attack the fungus in this position and also to prevent 

 it from infecting the wood in future seasons. When the 

 wood is badly diseased, as much as possible without injuring 

 the trees should be cut out. This should be completed by 

 the end of March. The source of infection will in this way 

 be reduced to a minimum, although a certain amount is almost 

 certain to remain. To prevent, as far as possible, the new 

 wood being affected it is necessary to spray during spring 

 and summer (see details below). If this is properly done it 

 should be possible, not only to secure a clean crop that season, 

 but to preserve to a large extent the new wood and thus 

 eliminate the source of infection for the following season. 

 It is particularly important to spray Cox's Orange Pippin 

 and Lord Suffield (which develop scab badly on the wood), 

 as the disease spreads from these to other varieties which 

 would not otherwise be attacked. 



2. Spraying Mixtures. There are two mixtures which 

 may be used for spring and summer control, namely Bordeaux 

 Mixture and Lime-sulphur* (Burgundy Mixture has not been 

 found suitable). Lime-sulphur is the more easy to prepare, 

 but Bordeaux Mixture is undoubtedly the most effective, 

 though in the case of a few varieties of apples it is apt to cause 



* If caterpillars are likely to prove troublesome, lead arsenate paste 

 may be added to either of these mixtures at the rate of 1 Ib. to 20-25 

 gal. of the mixture. Further details as to the use of this substance, 

 which it should be remembered are highly poisonous, will be found in 

 Leaflet No. 4 ( Winter Moths], obtainable from the Ministry and also 

 included in Sectional Volume No. 2, price lOd. 



