40 



A " WltJier Tip " of Plum Trees 



Results on the &h and 8th days after inoculation. 



Branch I. 



May 17 



May 10 



(a) 1. One flower with style brown for 

 5 mm. 



2. The other flower with style brown 

 to base; ovary brown, and a brown dis- 

 coloi'ation is evident on the exterior of 

 the flower at j miction of pedicel and 

 calyx tul)o 



(fi) 1. Flower with style brown for 6 mm. 



2. Style brown to base, ovary also 

 brown 



(r) 1. Style brown to base 



2. Style brown to base, ovary brown, 

 base of calyx tube brown 



(d) 1. Style brown to base 



2. Style brown to base, ovary and base 

 of calyx tube also brown 



Controls: Of the rest of the flowers on this 

 branch some stigmas show a slight dis- 

 coloration 



1. Style brown to its base; base of pedicel 

 brown and suleate for 2 mm. 



2. Whole flower })rown and withered, calyx 

 l()l)e'-. recurved; pedicel Ijrown to base 

 and longitudinally suleate, discoloration 

 extending upwards into the base of the 

 other flower (No. 1 above) 



1. Style brown to base 



2. Nearly the whole of the calyx tube and 

 2 mm. of the pedicel are brown 



1. Style and ovary brown, calyx lobes dis- 

 coloured and recurved, base of pedicel 

 brown for 5 miu. 



2. Whole flower withering, calyx lobes re- 

 curved, pedicel brown to base and dis- 

 coloration extending upwards in the 

 other pedicel 



1. Style and ovary brown 



2. Whole flower withered and inclined on 

 its pedicel ; pedicel brown to base and 

 longitudinally suleate 



Most of the non-inoculated flowers now show 

 a slight discoloration of the stigmas; 

 three also show a browning for 1 mm., 

 while one flower has its style brown to 

 base 



Branch III. 



May 17 



(a) Both flowers with brown styles, the dis- 

 coloration beginning to extend into the 

 ovary 



(/>) One flower with style brown for d mm. 

 the other with stvle brown to base 



(c) Both flowers have styles brown to base 

 and the ovaries are also brown; one is 

 also discoloured at the base of the calyx 

 tube 



(il) I']ach flower has style brown to base and 

 ovary also brown; one has a trace of 

 brown at the base of the calyx tube 



Vonlroh: One flower at the node next below 

 (c) has its style brown for 1 mm. ; other- 

 wise there is no distinct disc()loratif)n on 

 anyof the non-inoculated flowers of this 

 branch 



May 10 



Style and the whole of the ovary brown in 

 both flowers 



Both styles brown to base; in one flower the 

 discoloration also extends through the 

 ovary and is to I)e seen on tlie outside in 

 the basal jjart of the calyx tube 



Both flowers brown and withered wilii re- 

 curved sepals; pedicel of one of tiieni 

 brown and suleate for half its length, the 

 other brown to its base 



Both flowers brown and withered with re- 

 curved sepals; pedicel of one brown and 

 suleate for 1 cm., the other to its base 



Some of the non-inoculated flowers still 

 show no discoloration whatever, others 

 have brown stigmas and one has its style 

 brown fill- ;5 mm. 



