Self-sterility in Dewberries and Blackberries 
9 
The results of the self-sterility test are set forth in the following table: 
Table No. 1 
DEWBERRIES. 
V ariety 
Species 
Number of 
Bags 
Recovered 
Bags with 
Perfect 
Fruits 
Bags with 
Imperfect 
Fruits 
Bags 
with No 
Fruits 
Austin... . . 
Villosus 
75 
74 
1 
o 
Chestnut... ... . 
Trivialis 
55 
0 
3 
52 
Cox 
Hvbrid 
38 
34 
1 
3 
Ruth. _ 
Hybrid... . 
27 
26 
1 
o 
Grandee. 
Trivialis.. .. 
31 
0 
10 
1 
Limekiln . 
Trivialis . . 
37 
0 
0 
37 
Lucretia . 
Villosus 
30 
28 
2 
o 
Haupt. . 
Hybrid.. _ . 
30 
0 
2 
28 
Manatee_ 
Trivialis 
71 
0 
20 
Munroe.. . 
Trivialis 
32 
0 
0 
32 
Premo. __ . . 
Villosus.. . . 
56 
0 
0 
56 
Elijah, No. 2 . 
Trivialis 
23 
0 
0 
23 
Rogers.. _ 
Trivialis . .. 
44 
1 
8 
36 
San Jacinto... 
Trivialis.. 
58 
0 
1 
57 
White _ 
Trivialis- . . 
59 
0 
1 
58 
By means of the above table we can readily group the dewberries and 
the hybrids (those grown as dewberries) into two well defined classes, 
namely, those that are self-fertile and those that generally are self- 
sterile. 
The imperfect fruits listed with the self-fertile varieties will need no 
explanation, other than that untoward conditions frequently prevent the 
realization of an entire crop of perfect berries. But the imperfect 
berries listed with the otherwise self-sterile varieties need a few words 
of explanation. In the first place, the imperfect fruits, viewed from the 
point of commercial value, are negligible, for none of them were com¬ 
posed of more than eight druplets and most of them averaged less than 
four per berry. Furthermore, of those imperfect fruits produced by 
self-fertile varieties there were relatively many in each bag, while of 
those produced by the self-sterile varieties there were relatively few, not 
more than one fruit in the bag in most cases. 
In the case of the Rogers variety, one bag produced one perfectly 
well formed and fully developed fruit. Besides this, eight bags with 
very small nubbins were also found. This well developed fruit undoubt¬ 
edly Avas the result of the failure of the operator to remove a bloom 
w r hich had already been fertilized and had dropped its petals. This 
fruit was produced in the year 1909, when twelve other bags produced 
only two imperfect fruits. This variety was again tested in 1910 and 
subsequently again in 1911. Of thirty-two bags recovered, no perfect 
fruits and only six very imperfect ones were discovered. We can thus 
safely disregard this one perfect fruit; hut the imperfect ones of this 
