Colokaih) Plant Diseases 
35 
are formed on the stems of the plant. The black spores live over 
the Avinter and germinate in the spring just in time to infect the 
young plants. In controlling asparagus rust, therefore, it is 
necessary to destroy by burning all diseased stalks. Asparagus often 
escapes from cultivation and grows along fence rows. Unless these 
sti'ay plants are destroyed they Avill seiwe as sources of early spring 
infection. 
Dusting with dry dowers of sulfur has been recommended for the 
control of this rust in California. The best grade of flowers of 
sulfur should be used. The first application should be made at the 
rate of 150 pounds per acre about three Aveeks after the last cutting 
of sprouts. This should be followed by a second application at the 
rate of 100 pounds per acre one month later. The sulfur should 
be applied in a fine dust preferably in the early morning AA^hile 
the plants are Avet Avith deAv. 
Bordeaux mixture (5-5-50) to Avhich has been added a resin 
mixture is also said to be effective. The resin mixture Avhich should 
be added to the Bordeaux mixture is made as folloAvs : resin, 5 
gallons; potash lye, 1 pound; fish oil, 1 pint; and Avater, 5 gallons. 
Tavo gallons of this mixture diluted to ten gallons should be added 
to forty gallons of Bordeaux spray. A variety of asparagus knoAAui 
as Palmetto is said to be resistant to rust. 
BEAN 
Bacteriosis (Pseudomonas phaseoli) (31), (32), (33) — Bacteriosis 
V or Bacterial Blight is one of the most serious diseases of the bean in 
Colorado. It attacks the stems, leaves, pods and seeds of both field 
and garden beans. Watery amber yellow spots ranging in size from 
tiny specks to areas of one-half inch in diameter are produced on the 
pods. The spots are irregular in outline and often have a red margin. 
If a spot occurs just over a seed Avithin the pod the disease is likely 
, to penetrate entirely through the pod and affect the seed. 
r The spots formed on the stems and leaA^es are very similar, at 
f first, to those on the pod but rapidly turn broAAUi, becoming dry and 
I brittle. If the disease is severe the plants aauII shed th'eir leaves and 
I fail to mature seed. 
A' 
P Bacteriosis as the name implies is produced by bacteria AA^hich 
enter the plant through its breathing pores or Avounds produced by 
V mechanical injury. The organism lives over the winter on diseased 
A seed. 
Hand pick disease-free seed from healthy plants. Plant th*e seed 
