An Apricot Bright. IB 
In Experiment No. 9 the disease made good growth in three twigs, extend¬ 
ing eight inches in one. The growth was slight in two twigs w 7 hile the remain¬ 
ing two gave negative results. 
The disease made good growth in all of the twigs in Experiment No. IO 7 
one of them being blighted for 18 inches of its length. All twigs blighted in 
Experiment No. 11. One diseased 18 inches of its length and others for 12 
inches. The twigs used in this experiment were younger and more succulent 
than the others, which no doubt accounts for the greater growth. Check twigs 
all sound. 
There being no apricot trees on the College grounds, Mr. J. 
S. McClelland kindly offered the use of one of his trees for experi¬ 
mental purposes. Accordingly inoculations were made in the 
twigs of this tree as shown in Table III. The tree bore no fruit 
this season. 
TABLE III. 
Inoculation of Apricot Twigs with Cultures of Bacteria Secured from Diseased 
Apricot Twigs, Apricot Fruit and Apple Twigs. 
No. of 
Experiment. 
No. of 
Twigs. 
Source of 
Culture. 
Date of 
Inoculation. 
1 
Date of 
Examination. 
Results. 
No. 13. 
7 
Apricot twig. 
July 8 
August 5 
Three blighted ; four, no results.. 
No. 14. 
5 
Apricot fruit. 
July 8 
August 5 
All made some growth. 
No. 15. 
7 
Apple twig. 
July 8 
August 5 
Five blighted; two, no results. 
No. 16. 
7 
Check. 
August 5 
Sound. 
In Experiment No. 13, three twigs of the seven were blighted; one five 
inches, one eight inches and the third, 10 inches. New grow T th was selected for 
the experiments and the inoculations were made as near the tip as possible. 
The four twigs that gave no results made a rapid growth after inoculation, of 
from 18 to 20 inches. And curiously enough two of them were blighted at their 
tips. .This can be accounted for by natural infection from the inoculated twigs 
as four other twigs were found on the tree that were blighted. None of the 
check twigs showed any evidence of blight and there was none found on the 
other tw T o trees that stood within 12 feet of the tree experimented on. 
All of the twigs in experiment No. 14 were diseased; the blighted areas 
varying from one to four inches in length. 
Cultures of known pear blight were used in Experiment No. 15. Five of 
seven twigs were blighted, two of them for eight inches from the tip where tho 
inoculations were made. 
The disease was recovered in pure form from the inoculated 
apricot twigs and apples on the tree were inoculated as shown in 
Table IV. Specimens of diseased ripe apricots were received at 
about the this time, together with blighting twigs. Cultures 
were made from both sources and inoculations were made as is 
also shown in table IV. 
