17 
5. Young twigs frequently develop an abnormal number of buds in 
the axils of the leaves, where, under normal conditions, only one or 
two are formed (fig. 2, cand d). This overproduction of buds is often 
followed by a gummy exudation at these points. Several of these buds 
from one node may develop into branches, which, in connection with the 
- short internodes, frequently give the new growth a somewhat fascicled 
appearance. ‘This causes a very dense foliage, and after the new 
growth, which produces this fascicled. appearance, has died back the 
tree takes on a very regular appearance, as if it were clipped. This 
is very characteristic of cases in the middle stage of the disease. Ina 
later stage large limbs die back, leaving around the trunk a dense 
growth of small water sprouts with large leaves. ‘These shoots in turn 
become stained with the characteristic reddish-brown exudations and 
eruptions and finally die back. In this stage of the disease, which is 
one of the last, the tree presents a very ragged TD OIE, many of 
the large limbs “emne dead (PI. LV). 
6. The leaves on trees affected with die-back are rather larger and 
generally longer and more pointed than those on healthy trees. This 
symptom, however, is not very noticeable. 
7. The foliage of diseased trees is always a very dark green; indeed 
this color, so much desired by some growers, indicates that the grove 
is on the verge of showing the disease. 
8. Frenching or spotting of the leaves with white and green fre- 
quently occurs in the more advanced stages of the trouble, but can 
hardly be considered a symptom. 
9. Slightly swollen, stained spots often occur on leaves of trees in a 
medium stage of the disease. Any slight mechanical injury or injury 
due to the attacks of the six-spotted mite (red spider), which works in 
definite spots, is liable to be followed by a swelling of the leaves at the 
points injured, accompanied by the characteristic stains, thus forming 
brown, swollen spots. These spots are evidently formed only in places 
where the leaves are injured. 
10. The fruits of diseased trees early assume a pale, sickly green 
color, which is quite different from the dark-green color of normal fruits. 
Some fruits split and fall while in this condition, but by no means as 
many as fall in the next stage of the disease. 
-11. When the fruits reach a size of from 1 to 1§ inches in diameter 
they gradually change color, turning light lemon elba and commonly 
Showing a slight brown exudation in places on the rind (PI. III, figs. 1 
and 2). At this stage many fruits fall; this usually occurs nites the 
appearance of the brown stains, but sometimes before. On trees slightly 
affected many of the fruits fall early, while on trees badly affected it is 
seldom that any fruits remain on the tree until they reach full size. The 
fruits usually split before dropping. At first a slight crack appears 
around the eye end or apex of the orange, accompanied by a slight 
gummy exudation (PI. III, fig. 1). Finally a large split opens across 
5122—No. 8——2 
