398 Report of the Department of Entomology of the 



ing over the surface of the water, kerosene proved the best. Many 

 millions of the bugs drifted ashore and were killed by the treatment. 



The water was drained from the bog during the night of 

 July 24, beginning at 8:30 p. m., and by morning was back 

 in the ditches. The men began raking the drift rubbish from the 

 vines on the margin of the bog where the receding waters had left 

 it, after which the rubbish was sprayed again with kerosene. On 

 the next day it was found that a few living bugs were coming from the 

 masses of rubbish and the thick grass and were working back to 

 the bog. A knapsack was rigged with a ten-foot rod and " Mistry Jr." 

 nozzle for spraying kerosene and burning it at same time. (Plate 

 XIV, fig. 1.) With this outfit the bugs contained in the thick grass 

 and wet rubbish were destroyed. 



The items of expense in disposing of the insects along the margins 

 of this 30-acre bog are as follows: 65 gals, of kerosene, $7.50; labor, 

 3 men for one day, $5.25. This makes a total cost of $12.75 for the 

 final spraying and burning operations. 



Results on insects and plants.— On August 6 the bog was carefully 

 examined to note the effects of the different operations on the numbers 

 of the bugs. All portions entirely covered with water were generally 

 completely free of the pest. As in former experiments, varying 

 numbers of the insects could be found near unsubmerged weeds, grass, 

 sedges and vines. Only a few nymphs of the first instar were detected, 

 indicating that but few eggs were not hatched at the time of flood- 

 ing or that small numbers of the insect in the very immature stages 

 may withstand immersion. There were no indications of scalding 

 of fruit as a result of the flooding. 



Bog No. 1. — Profiting from the experience during the previous 

 year on this bog and from the experimental operations just completed 

 on Bog No. 2, as described above, an effort was made to have all 

 the sections of the bog to be flooded clean at the time of overflowing. 

 Besides removing all weeds and sedges from the beds, the margins 

 of the ditches as well as those of the bog were mowed. The effects 

 of these operations in facilitating the submersion of the marsh is 

 shown in Plate XIII, fig. 1. 



On August 1, at 5 p. m. during a rain storm, the water was turned 

 on, and by 6 a. m. the next day the flooded sections of the bog 

 were well covered. Unfortunately the wind dropped and proved 

 hardly strong enough to compel the bugs to drift ashore. As the 



