HUNGARIAN VETCH. 
owers on the setting of seed of Hung* 
reg., 1915 to 1921, inclusivt (except 1917). 
Table 6. — Eject of tripping flowers on the setting of seed of Hungarian vetch at Corvallis, 
Or eg. 
Flowers tripped. Flowers not tripped. 
Year. 
Total 
number. 
Number 
Percent- 
Total 
Number 
Percent- 
setting 
age set- 
setting 
age set- 
pods. 
ting pods. 
pods. 
ting pods. 
1915 
65 
25 
39.5 
65 
8 
12.3 
1916 
7_> 
36 
50 
72 
12 
16.6 
1918 
21 
16 
76 
18 
6 
33 
1919 
174 
125 
71 
322 
93 
28 
1920 
125 
93 
73 
160 
58 
36 
1921 
95 
76 
80 
80 
48 
60 
Total.... 
552 
351 
63.6 
717 
225 
31.3 
In order to determine whether or not cross-pollination is essential 
to seed setting in Hungarian vetch, a number of flowers were inclosed 
in paper bags so as to exclude even small insects, such as thrips, 
which had ready access to the cages used in the tripping experiment. 
The flowers thus inclosed set a smaller percentage of pods than the 
untripped flowers in the cages. However, in only one season out of 
seven was the percentage sufficiently low to indicate sterility in any 
way. While the results of these experiments indicate that Hun- 
garian vetch is self -fertile and will set seed readily without the inter- 
vention of insects, it also seems apparent that the visitation of 
insects that trip the flowers results in an increased seed production. 
INSECT ENEMIES. 
There are no insects that have done serious damage to Hungarian 
vetch. In seasons when common vetch and other vetches have been 
seriously attacked by aphids, Hungarian vetch has suffered little or 
no damage. It seems to be quite immune to attack by these insects, 
at least when it is growing in association with other crops on which 
the aphids can feed. 
FUNGOUS DISEASES. 
In so far as Hungarian vetch has been grown in the United States 
it has not been attacked by any fungus, even when grown in close 
proximity to other vetches that were being more or less damaged. 
It apparently is more or less immune to the leaf-spot ( Mycosphaerella 
■pinocles) and false anthracnose (Protocoronospora nigricans). While 
this vetch has not as yet been attacked by any serious disease, it has 
not been grown extensively enough to say to just what extent it may 
be immune. 
NEMATODE INJURY. 
In experimental plantings at Auburn, Ala., Tifton, Ga., and 
McNeill, Miss., root-knot nematodes (Heterodera radicicola) wore 
found on Hungarian vetch, apparently doing considerable damage. 
To what extent this infestation will interfere with the growing of 
this variety in the Southern States has not yet been determined; it 
perhaps will exclude its use in the sandy Coastal Plain area. In the 
western United States no damage from nematodes has as yet been 
noted. 
