30 BULLETIN 727, U. §. DEPARTMENT OF AGRICULTURE. 
On July 26 a second center was found in the experimental field 
with secondary infection present. The rains of July 17, 19, and 21 
probably account for this secondary infection, as well as that noted 
about the centers in the neighboring private field. An inspection 
of all of the 217 plats in the experimental field on July 28 resulted 
in the discovery of the disease in only two other plats. One week 
later scattered anthracnose lesions were noted in five more plats. 
It is of interest to note that up to this time all the anthracnose infec- 
tion in this field was confined to one area consisting of 15 adjacent 
plats. i 
A careful inspection of all the plats on August 9 and 10 revealed 
anthracnose in five more plats in the area mentioned above and 
tertiary infection was noted about the old centers. Due probably 
to the rains of August 1 to 5, there followed a very rapid spread of the 
disease. An inspection of the field on August 17 and 18 revealed 
anthracnose in 45 plats outside of the diseased areas already alluded 
to. In two of these cases the infection was in apparent original 
centers. Thus, the most rapid spread in 1915 seems to have occurred 
prior to the middle of August, and it will be remembered that wet 
weather prevailed the first five days of that month. A frost killed 
the vines on August 28. 
DEVELOPMENT IN 1916. 
In the summer of 1916 the cucumber experimental work was lo- 
cated at Madison. With five rather scattered experimental fields, 
numerous small garden patches, and twa private fields under con- 
stant observation during the early part of the summer, anthracnose 
was found only in the five experimental fields. 
A diagram showing the weather conditions during this season is 
presented (fig. 12), to which reference may be made in connection with 
the discussion of the progress of the disease. 
The disease was first noted on July 19, in field 1, planted five 
weeks previously. This center consisted of infection on two adjacent 
plants. As in 1915 the first infection was not found until after the 
rows had been thinned. All of the lesions were less than 1 cm. in 
diameter. On July 20 another center of two infected plants was 
found in field 1, and three centers of infection were found in field 2. 
On July 21 a third center was found in field 1 and a center was found 
in field 3. On July 22- anthracnose was found on one plant in 
_ field 4 and a center of two infected plants was found in field 5. 
Rather thorough inspection of fields 1 and 2 made on July 26 and 
27 revealed 12 additional centers in field 1 and two in field 2. On 
August 1 eight more centers were found in field 2 and the following 
day five more were found in field 1. The relation of this rather sud- 
den increase in the number of new centers of infection to weather 
