June IS, 1915 Soil Moisture and Sugar-Beet Root Louse 



245 



was kept moist the infestation was reduced to 31.4 per cent. Moreover, 

 the sugar beets that received the greater number of irrigations yielded 

 the highest in sugar and in weight. 



Table IV. — Record of sugar-beet root-louse increase under different soil-moisture con 

 ditions. Huntley irrigation experiment 



Number of plots and 

 number of irriga- 

 tions. 



3 plots, 2 irriga- 

 tions 



3 plots, 5 irriga- 

 tions 



Condition of sugar beets at harvest. 



Number 



of plants 



unin- 



fested. 



2,659 

 5. 196 



Niunber 

 of plants 

 slightly 

 infested. 



4,343 

 2,053 



Number 

 of plants 



badly 

 infested. 



457 

 245 



Number 



of plants 



very 



badly 



infested. 



87 

 84 



Percent- 

 age of 

 infes- 

 tation. 



64. 7 

 31^4 



Percent- 

 age in- 

 juriously 

 infested 



7.2 

 4^3 



Average 



sugar 

 content. 



Total 

 yield. 



Per cent. Pcninds. 

 14-3 7,405 



16. 4 I 8, 984 



I 



IRRIGATION EXPERIMENTS AT BOZEMAN 



Four one-quarter-acre plots of sugar beets located on the Montana 

 Experiment Station farm were used for the experiment. There were 

 numerous cottonwoods within a mile of the plots, and two years previ- 

 ously sugar beets in the same location had been heavily infested mth lice. 



The sugar beets were not harvested until October 18 and were sub- 

 jected to considerable rain during September and early October. The 

 precipitation was considerably greater than at Huntley and Edgar 

 (Table V). 



Table V. — Record of rairifall at Baseman, Mont., from June 75 to Oct. 15, IQ14 



The beets were grown according to ordinary farm practice, except 

 in the matter of irrigation. They were put in late, however, and a very 

 poor stand was obtained, which accounts for the low yield. Two plots 



