142 



the infection of these fields on the morning- of Saturday, June 23. In 

 field A the infection was put m the axils of the leaves and at the bases 

 of the stalks of every hill of rows 4 and 5, and 7 and 0. In field B the 

 same was done for rows 2 and 3. 



Search Avas made before distributing the infection for possible Sporo- 

 triehum bugs, already spontaneously in the field, but none were found. 

 Previously to June 23 there had been frequent rains, so that the 

 ground was moist at this time. On the night of June 23, heavy 

 rain fell, and again on the afternoon and night of June 24. The after- 

 noon rain was accompanied with heavy hail. Some of the stones were 

 an inch in diameter. The night rain of the 24th was driven by a strong 

 west wind, so that the corn was laid flat in places. The field was 

 visited on the afternoon of the 25th and the bugs were found in as good 

 condition and as numerous as when first noticed on the 23d. It was 

 the intention to scatter more infection on the 25th, but a rain storm 

 came and further infecting was deterred. On the morning of June 26 

 a bucket of soil was taken from the infection box and scattered in each 

 hill of rows and 10 and row 15 "of field A. At this time the bugs 

 appeared in good condition, and no signs of the spread of the infection 

 were apparent. The bugs had advanced somewhat into field C, and 

 infection was scattered down row 15 of this field for the few rods the 

 bugs extended, and also in different places in row 15. The morning of 

 June 26 was warm and clear. 



On the morning of June 28 a bucket of earth from the infection box 

 was scattered at every alternate hill throngh row 18 of field A, and at 

 intervals of every two or three hills through rows 1 and 2. Only a few 

 Sporo bugs could be found. The bugs were working in great force. 

 Under clods and fallen stalks and leaves large numbers of the bugs 

 were gathered for molting. Most of the bugs on the standing corn 

 were black larvse and pupiv, but there were a few red larva^ and a few 

 old winged and newly-molted winged individuals. The morning clear 

 and warm. A slight shower on the night of the 27th. Earth moist in 

 the field. 



July 2 : Bugs from the infection boxes sufficient to infect each hill 

 for two rows were scattered in field A where the bugs were thickest 

 out to the fifty-second row, the bugs having extended to that distance. 

 A few white fungous bugs could be found at nearly every hill. The bugs 

 were apparently not more than half as numerous as when the field was 

 first infected, but they had scattered as far as the fifty-second row, and 

 this may account for the apparent decrease. Bugs are continually 

 hatching and molting at this time. 



July 5: There was a heavy rain on the morning of the 4th. Bugs 

 covered with Sporotrichum can be found in great quantity under fallen 

 cornstalks and clods. One and one-half gross of pill boxes were filled 

 fi*om the field today. The victims are chiefly old bugs, but not all. 



