H. WOKMALD 189 



Variety Cox^s Orange Prppin. 



{(i) Truss of a spur 1 cm. lou^' on a branch (0-4 cm. in thickness) 

 bearing a terminal vegetative shoot distal to the inoculated truss. 

 April 19. A single flower inoculated by placing conidia on the stigmas. 



,, 27. Stigmas brown to base, stamens drooping. 

 May 1. Truss wilting : flowers and leaves drooping, the latter curled 

 and brown. 

 ,, 5. Branch, bearing the truss, half girdled by a canker proceeding 



from the base of the spur. 

 ,, 9. Branch three-fourths girdled : leaves of the vegetative shoot 

 on the same branch flagging. 

 June 8. Canker extending to 5 cm. below the infected spur. The 

 upper limit of the canker was not distinctly marked, but 

 the distal portion of the branch was quite dead by this time. 

 Jan. 9 (1917). Well- developed Monilia pustules present on the dead 

 spur. 

 (6) Truss of a spur 0-5 cm. long on a twig (0-4 cm. in diameter) 

 bearing another flowering spur distally. 

 April 19. A single flower inoculated as in [a). 



„ 27. Stigmas of inoculated flower brown and withered, stamens 

 collapsed, pedicel discoloured to its base, sepals brown and 

 withered. Other flowers of the same and of the neighbouring 

 trusses showed a little browning of the stigmas on this date 

 but in every case the stamens were upright and the pedicels 

 and sepals were not discoloured. 

 May 1. Truss withered: flowers drooping, leaves curled and brown. 

 ,, 3. The other truss (not inoculated) on same twig wilting. 

 ,, 5. Twig completely girdled, both trusses dead. 

 June 8. Twig dead to the level of its insertion on the stem, but no 



canker had developed on the latter. 

 Jan. 9 (1917). One Monilia pustule present at the base of the spur. 



(c) A flower inoculated on April 19 showed the same symptoms of 

 the disease as in («) and (b) to April 27 when the stigmas were brown to 

 the base, the stamens collapsed and the pedicel brown throughout its 

 length ; on April 29 however it was accidentally removed, evidently 

 before the fungus had invaded the tissues of the spur itself for the leaves 

 were still alive in June. None of the flowers of this truss set into fruit 

 but this was probably due to non-pollination. 



Ann. Biol, iii 13 



