10 STATE UNIVERSITY EXPERIMENTAL STATION. 



out, earth and all, and used for the infection of these fields, on the morning 

 of Saturday, June 23. In field A, the infection was put in the axils of the 

 leaves, and at the bases of the stalks of every hill of rows 4 and 5 and 7 

 and 9 ; in field B, the same was done for rows 2 and 3. 



Search was made before distributing the infection for possible Sporo- 

 trichum bugs, already spontaneously in the field, but none were found. Pre- 

 viously 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 afternoon rain was accompanied 

 with heavy hail. 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 on the 23d. It was the intention to scatter more infection on 

 the 25th, but a rain storm came, and further infection was deferred. On 

 the morning of June 26, a bucket of soil was taken from the infection box 

 and scattered in each hill of rows 9, 10, and 15, 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 a third 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 through row 18 of field A, and at in- 

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

 bugs could as yet be found. The bugs were working in great force. Un- 

 der clods and fallen stalks and leaves large numbers of the bugs were gath- 

 ered for moulting. Most of the bugs on the standing corn were black larva? 

 and pupsd, but there were a few red larvae and a few old, winged and newly 

 molted, winged individuals. The morning was 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- 

 fungus bugs could be found at nearly every hill. The bugs were ap- 

 parently 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 were continually hatching and moulting 

 at this time. 



July 5. — There was a heavy rain on the morning of the 4th. Bugs cov- 

 ered with Sporotrichum can be found in great quantity under fallen corn- 

 stalks and clods. One and one half gross of pill boxes were filled from the 

 field to-day. The victims are chiefly old bugs, but not all. 



July 9. — More Sporo. bugs were scattered along the advance line of the 

 the chinch bugs. The bugs had made very little headway since the 2d of 



