Diseases oe Beans 
31 
It is our purpose to make a study of this disease during the com¬ 
ing summer and to determine, if possible, its cause and control. 
Fig. VI.—Bean plant affected with “Streak”. (By courtesy of Dr. H. G. Mc¬ 
Millan.) 
MEASURES OF CONTROL 
The measures of control which can be recommended for any one 
of the diseases described, apply equally well to all. Accordingly, this 
phase of the question has not been taken up in connection with the 
individual diseases, but has been reserved for consideration as a whole. 
1. Plant beans on the same land not oftener than once in three 
or four years, particularly if disease has been prevalent. Soils which 
once become thoroly infected as a result of continuous cropping are 
seldom safe to use for the same or closely related crops for years to 
come. 
2. Wherever practical, destroy all diseased vines and trash by 
burning. 
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. 
