32 BULLETIN 876, U. S. DEPARTMENT OF AGRICULTURE. 
useful remedy is to apply the following mixture as a spray at the 
earliest possible moment: 
Powdered arsenate of lead.......-....2222-0seeeeeeeeeeeee- 1 pound. 
Water. cei shies st oe ae ee ere 50 gallons. 
Where this poison is used at the strength specified, there is com- 
paratively little danger of poisoning cattle. It is advisable, however, 
not to pasture vetch that has been sprayed with this mixture until 
after heavy rains have occurred. 
DISEASES. 
But little work has been done in the matter of identifying and 
determining methods of control for the diseases of hairy vetch. 
A leaf-spot disease (VWycosphaerella pinodes) attacks the leaves of 
hairy vetch quite frequently and does some damage. Another disease 
(Protocoronospora nigricans), which attacks the stems, leaves, and 
pods, has done considerable damage to hairy vetch and has been 
especially serious the past few years in the South Atlantic States. 
No control measures have been worked out for either disease. 
SUMMARY. 
Hairy vetch is one of the best legumes for green manuring and 
general soil improvement. 
It is especially valuable for use in Michigan and other States 
bordering on the Great Lakes. It is also of value in most of the 
Atlantic and Gulf Coast States. 
‘The viny character of hairy vetch makes it somewhat difficult to 
handle, but the high cost of seed has been the greatest handicap to 
its more extended use. | 
In the past, large quantities of hairy-vetch seed have been im- 
_ ported, but in more recent years this quantity has been greatly 
reduced. The reduction in imports, resultmg in the high price of 
seed, has lent interest to home production. 
Michigan has been the principal center for the production of 
hairy-vetch seed, but seed production has proved successful in prac- _ 
tically all localities where the crop can be grown. 
Hairy vetch is adapted to a wide range of soil types, but it does 
best on rich sandy loams. 
The crop can be seeded, harvested, and thrashed with ordinary 
farm machinery with but little or no modification. | 
The seed of hairy vetch is difficult to separate from the small a 
grains with ordinary seed separators, but the spiral separators now 
used in many localities successfully separate these seeds. 
S 
