190 .1 mossout Wi/f and Canhr of Apple Trees 



Variety Worcester Pearmain. 



(a) Truss of a spur 1 cm. in length on a branch 0-4 cm. in diameter. 

 April 19. One flower inoculated on the stigmas. 



,, 27. Styles brown to the base, stamens collapsed. On a neigh- 

 bouring control truss of the same age the styles were not 



brown and the stamens were upright. 



Flowers and leaves of the truss drooping. 



Truss withered, leaves brown and curled. 



Canker present on the branch, nearly girdling. 



Young pustules (bearing very short chains of immature 



conidia) appearing. 

 Jan. 9 (1917). Conspicuous Moyiilia pustules present on the canker 



and dead spur. 

 Truss of a spur 1-5 cm. in length on a branch 0-5 cm. in diameter. 



One flower inoculated on the stigmas. 



Styles of inoculated flower brown, some of the stamens 



collapsed ; these features were not present on a neighbouring 



control truss. 



Flowers and leaves of the truss drooping. 



Truss withered, leaves brown and curled. 



Canker present round the base of the spur, girdling the 



branch and extending 2-5 cm. below the insertion of the spur ; 



that portion of the branch distal to the canker was dead. 

 Jan. 9 (1917). Several Monilia pustules present on the dead spur. 



Variety Lord Derby. 



On this variety the inoculations which resulted in wilting were made 

 on trusses borne on short spurs at nodes on the main stem of a young 

 tree. The flowering spurs were four in number and inserted at successive 

 nodes, the stem being 0-6 to 0-7 cm. in thickness in this region. The 

 uppermost truss (a), borne on a spur 2 cm. in length, was inoculated; 

 at the next node below was an untreated control truss (b) ; the third (c), 

 on a spur 1 cm. long, was inoculated while the fourth (d) was another 

 control. Within a few centimetres of (a) the stem divided into three 

 branches all bearing leaves only. 



April 19, The first flower to open (i.e. in the centre of the inflorescence) 

 of each of the two trusses (a) and (c) was inoculated by 

 placing conidia on the stigmas. 



