30 
The Colorado Experiment Station 
3. If the bean straw from diseased vines is to be fed, do not 
use the manure on a field that is to be planted to beans. 
4. As far as possible, avoid cultivating the beans early in the 
morning when there is dew on them, or when they are wet with 
rain. 
5. Hand pick disease-free pods, or if possible, select disease- 
free plants, for seed. Use these to plant a seed plat on land which 
has never raised beans and which is removed some distance from 
the main crop. 
Remember that hand picking of seed as it comes from the 
flail or thrasher for the purpose of controlling disease is of no 
value, since it is impossible to detect even a small percentage of 
diseased seed. 
6. Seed treatment for beans is of no practical value since any 
chemical that would penetrate the seed deeply enough to destroy 
the disease-producing organism would likewise be apt to kill the 
seed. 
7. Spraying with Bordeaux mixture, 5-4-50 formula, even 
when done thoroly by competent persons, is at best unsatisfac¬ 
tory, unprofitable and only partially successful. However, if one 
Fig - . VI.—Bean plant affected with “Streak”. (By courtesy of Dr. H. G. 
McMillan.) 
