28 Contagious Diseases of the Chinch-bug. 
tities to destroy all bugs susceptible to the infection as soon as 
the weather became favorable for the growth of the fungus. 
We will here detail two of the field experiments which will 
be fairly representative of all. 
The first experiment, which is also the first of the season, 
shows an exception to the rule above stated in that the artificial 
infection appeared to give favorable results at first. Later, 
however, results could not be determined with certainty. 
1.— FIELD EXPERIMENT No. 1. 
On March 10 chinch-bugs were found hibernating in great 
numbers under stones on Mr. Marshall’s farm near Willow 
Springs. Sporotrichum had been distributed on this farm in 
1894. On March 23 half a pint of live bugs were gathered from 
under the stones on this farm, and at the same time spores of 
Sporotrichum from artificial cultures on squash and turnip were 
dusted under the stones dry, and also sprayed in water. On 
March 30 the bugs were reported to be dying under the stones 
where the infection had been put. 
On April 2 Mr. Marcy visited the farm, and found from five to 
10 bugs dead with Sporotrichum under each stone where the in- 
fection had been put, but he was unable to find any Sporo- 
trichum where the infection had not been distributed. 
On April 14 Mr. Marcy again visited this farm, and the bugs 
were very much diminished. Sporotrichum had increased, but 
not in sufficient amount to account for the diminution of bugs 
observed, and it is concluded that the bugs had scattered. 
On June 25 Mr. Marcy again visited this field. Before this 
date Mr. Marshall had infected the field with Sporotrichum- 
covered bugs, and the wheat had been cut and the bugs had 
passed to adjoining timothy and corn fields. On the borders 
of the wheat-field, where the ground was shaded by a rank 
growth of weeds, bugs dead and covered with Sporotrichum 
were found in great abundance; but still the bugs were quite 
numerous in the timothy and corn fields and were doing con- 
siderable damage. 
On another farm worked by Mr. Marshall, about three-fourths 
of a mile distant, artificial cultures of Sporotrichum had been 
applied with a sprayer, and Sporotrichum was found abundant ; 
however, four or five acres of corn had been destroyed at this date. 
