41 
8. The felt of conidiophores, usually most noticeable about the 
base of the bud. : 
9. That the lesion often extends down the stem for some dis- 
tance below the bud. (Study illustration specimens and autochromes.) 
SKETCH to show the external characters of bud-rot. 
Some of the dry rotted buds have been moistened to put them in a more 
characteristic condition. Carefully dissect one of these and OBSERVE :— 
10. That the innermost parts of the bud are involved, the petals 
being very soft and decayed. 
11. That the petals do not separate readily from one another 
being held together by the mycelium of the pathogene. By carefully 
tearing apart two adjoining petals the stretched and breaking hyphae may 
sometimes be detected. 
12. Mats or wefts of mycelium which may sometimes be ob- 
served in the cavities of the bud. 
ie bud-rot phase of this disease is probably its most serious feature. 
y? ; 
On the blossoms. Blossom-rot. Sometimes the half-open buds are 
attacked. They turn brown and collapse and become a rotted mass. 
This occurs only during an epiphytotic of the disease in very wet weather. 
Examine the dried specimens provided. They give only a partial idea 
of this condition as it appears in the field. Compare with healthy blos- 
soms as shown in the autochrome. SKETCH. 
On the upper stem. It has already been seen that the stem at the 
base of the bud may and usually does become involved. Examine speci- 
mens that show upper stem-lesions. OBSERVE :— 
13. The brown discoloration and shrunken character of the dis- 
eased stem. 
14. In many cases, very characteristic alternating light and dark 
bands or zonations especially marked on stems just below rotted buds. 
(See autochrome.) 
15. On some of the lesions, conidiophore-felts. These are 
usually wanting on stem-lesions. 
16. Occasionally stem-lesions showing the small sclerotia of the 
pathogene as small black bodies bursting through the epidermis. (Examine 
illustration specimens or photographs showing these.) 
17. That sometimes the pathogene spreads from blasted small 
secondary buds or from blighted leaves into the stem, forming canker- 
like lesions. (Examine illustration specimens, photographs and auto- 
chromes.) 
SKETCH to show different types of upper stem-lesions. 
On the leaves. Leaf-lesions while they may occasionally appear early 
in the season become characteristic and abundant usually at the time of, 
or just after the blossoming-period. Examine specimens and photographs 
provided. OBSERVE :— 
18. The location of the majority of the lesions, i.e. the part of 
the blade involved. 
19. The average size and color characters of the lesions. Note 
evidences of zonation in some of them similar to those on the stem. 
20. Conidiophores. Where most abundant? That they are 
more scattered, i.e. less felty than on shoots and buds. 
SKETCH to show both surfaces of leaf-lesions. 
