H. WORMALD 



41 



Results on the 10th and 12th days after inoculation. 

 Branch I. 



May 21 



(ii) 1. 'I'ho discoloration at liaso of podiccl 

 cxtpiuls for 1-5 cm. upwards 

 2. This (lower l)cars small grey M on ilia 

 pustules 



{b) 1. Style, ovary and base of calyx tube 

 brown 



2. Pedicel brown for 3 mm. from the 

 calyx downwards; the stamens bear 

 Monilid pustules; the iiow(M' is detached 

 at its base but is attached to the? other 

 flower by its stamens 



(r) The pedicels of both flowers are brown 

 to the base and bear Monilia pustules 



{(I) 1. Calyx tube and 1 mm. of pedicel 

 brown 

 2. The pedicel now bears pustules 



Controls: The non-inoculated flowers have 

 discoloured stigmas and some have 

 styles brown for about 1 mm., but only 

 one flower is ouite dead 



May 23 



Both flowers are withered to base; the leaves 

 round the base of the umbel are wilting 



1. Flower itself brown; pedicel still green 

 but somewhat sulcate 



2. Stamens still entangled with those of 

 No. 1 



Both flowers quite withered to base; pedicels 

 bear pustules 



1. Flower brown to base of the pedicel 



2. No further evident change 



The non-inoculated umbels are setting into 

 fruit, except the one at node distal to (a) 

 and one other flower which i« dead 



Branch III. 



May 21 



May 23 



(a) 



{c) 



(d) 



Umbel broken off (probably during a 

 thunderstorm of previous evening) 

 1. No further change evident 



2. Calyx tube and half the pedicel 

 brown 



One flower is detached; the pedicel of 

 the other is brown for three-quarters of 

 its length 



Both flowers brown to base of pedicels; 

 one pedicel bears Monilia pustules 



1. Style brown to base and the discolora- 

 tion is extending in the upper half of the 

 ovary, which however has increased in 

 size 



2. Broken off 



Flower withered to base of pedicel 



Both flowers quite withered; the leaves 

 round the base of the umbel are wilting 

 and their petioles are brown at the brist 

 only {i.e. they are being invaded from the 

 point of insertion on the fruiting spur) 



The non-inoculated umbels are now setting 

 fruit 



Controls: The non -inoculated flowers gener- 

 ally show a discoloration of the stigmas 

 and a portion of the style (usually about 

 1 mm.) 



Result Jive weeks after inoculation. 



On June 14 the five branches treated showed results of inoculation 

 to be as follows : 



Branch I. 



This branch was dead at node c and from this node distally to the tip 

 oi the branch, which has evidently been girdled by a canker at node c. 



At node d the spur was dead but no canker had arisen round its base. 



