INSECT NOTES FOR IQII. 23I 



Laboratory check test. Several wire worms were placed in a 

 small covered jar with several similarly coated grains on Oct. 

 26. The larvae avoided the grains. A month later Paris green- 

 coated grains were put into the same jar; these were likewise 

 avoided. Later still sprouting grains were taken, covered with 

 Paris green but leaving the root and sprout unpoisoned. The 

 larvae in this case attacked sprout and root but left the grain 

 untouched. 



Plot 3. Grains were rolled in a paste of arsenate of lead of 

 the consistency of cream and allowed to dry before planting. 

 Resulting stand of corn very poor, no better than the check 

 rows. 



Laboratory check. Several wire worms were placed in a 

 small jar with some grains with which special pains were taken 

 to coat them heavily with arsenate of lead. Several days later, 

 some larvae were seen, each half buried within the grain, the hull 

 intact except for a small hole the diameter of the insect's body. 

 A month later only the hulls of the grains remained. All the 

 wire worms were still alive and apparently healthy. 



Plots 5, II, and 17. Check plots in which untreated corn was 

 planted. Stand very poor in September ; wire worms present. 



Plot 7. Planted with Canada field peas. Stand excellent in 

 September. Only a few wire worms found and these at the 

 lower end on the margin 01 the plot. 



Plot 9. Plowed weekly from July 27 to about Sept. i. To 

 be planted next year to determine effect of excessive cultivation 

 of the soil upon wire worms. 



Plot 13. A handful of tobacco dust was placed in each hill 

 with the corn. Stand very poor in September. The tobacco 

 when put into the ground was very strong but when the plants 

 were examined for wire worms it was found to be almost odor- 

 less, at which time the wire worms were apparently attracted 

 by the tobacco as they were especially abundant in it. 



Plot 15. A handful of slaked lime was placed in each hill 

 with the corn. Stand very poor in September. Wire worms 

 were found among the roots of the plant surrounded by the 

 more or less caked lime, apparently not inconvenienced thereby. 



Plot 19. "Bug death" instead of lime; otherwise as in Plot 

 15. Stand very poor in September; wire worms present. 



