Fungous Diseases oe Colorado Crop Plants 15 
and appear powdery. The spots that make their appearance in July 
and August are rusty in color, while those that come in September 
and October are black. 
Control .— (I) Dry sulfur: 
a. Use a finely pulverized sulfur, preferably ‘'flowers of sul¬ 
fur,” rather than "‘flour of sulfur.” ("“Flowers O'f sulfur” 
is a fine grade that has been sublimed. It sometimes goes 
by the name of “atomic sulfur.’' “Flour of sulfur” is a 
cheaper grade of ground roll sulfur.) 
b. Make first application to plants at rate of 150 lbs. per acre, 
about three weeks after the last cutting of sprouts. Fol¬ 
low with another application at rate of 100 lbs. per acre 
in about one month.' 
c. Apply sulfur only in early morning when plants are cov¬ 
ered with dew. The sulfur must stick to the plant. 
d. On small patches of asparagus, the sulfur may be sprinkled 
on with ordinary large pepper box. On large patches use 
some form of bellows-blower. 
(2) Spores are carried over winter on diseased stalks and on 
ground surface. I.ate in fall, cut and burn the diseased stalks in 
the field where they have fallen. Further, in order to insure the 
killing of spores on the ground, put a light covering of straw on 
the asparagus bed, and burn. 
(3) Select disease-resistant varieties. Palmetto is very resist¬ 
ant to asparagus rust. 
(4) Plants that have a good supply of water and are well cul¬ 
tivated, and as a result, are making a strong, vigorous growth, are 
less liable to attacks of rust than plants poorly cared for and de¬ 
prived of water. 
(5) Asparagus escapes from cultivation and frequently becomes 
common along fences. Unless such stray plants are destroyed, they 
may be a source of rust infection. 
BEAN. 
Bacterial Blight. —This occurs upon the pod, leaf, and stem 
of common and Lima beans. The leaves are usually the first to be 
attacked. At first there appear large, watery patches that are brown 
in color. Later these patches dry up. becoming papery and brittle. 
Hence the leaves curl and become ragged in appearance. Pods are 
most severely attacked. On these, the spots are small at first, but 
spread rapidly into large, watery areas with indefinite pink or red¬ 
dish-brown borders. In time, the pods rot. Infected areas on the 
stem are similar to those on the leaf. The'disease is carried over 
on infected seed. It is spread in the field by insects. 
