270 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 14 



Table I — The Effect on Millipedes of Soil Fltmigants and Contact Insecticides 

 Applied One Week Before Seeding 



Plot No. Materials Strength 



Ic. 



Id. 



2a. 



2b. 

 2c. 



2d. 

 2e. 



Lb. per 



Check Acre 



a. Sodium 150 



cyanide 

 lb. 250 



150 



250 



Check 



Creosote Dilution 

 oil 1-25 



1-50 

 1-100 

 Cresylic 

 acid 1-100 



1-200 



Amt. used 

 per plot 



Gal. 



7K 

 7K 



No. plants in stand Manner of application 

 Side Center Total 



rows 

 No. 

 192 



320 



12S 



176 



rows 

 No. 

 288 



192 

 336 



192 320 



No. 

 480 



No treatment 



Sprinkled in furrows 

 736 and covered at once 



Ground cultivated 

 320 before seeding. 



Sprinkled over sur- 

 512 face of soil. Raked 



over within 42 hrs. 



Ground cultivat ed 

 512 day before seeding. 



Table II- 



-The Effects on Millipedes of Soil Fltmigants and Contact Insecticides 

 Applied ai Time of Seeding 



Plot No. 



Materials Strength Amt. used 

 per plot 



Check 

 Creosote 



Nicotine 

 sulphate 



Sodium 

 Cyanide 



Check 



Nicotine 

 Sulphate 



Hydrate 



Lime 



Du=t 



1-200 



150 lb. 

 per A. 



2% 

 Nicotine 



Gal. 



No. plants in stand 

 Side Center Total 



rows rows 



No. 

 160 





 160 



240 



No. 

 320 



64 



320 



4 

 416 



480 



No. 

 480 



64 



704 



4 

 576 



720 



Manner of application 



No treatment 

 Sprinkled over surface 

 of soil after seeding 

 Lime broadcasted work- 

 ed into soil before seed- 

 ing. Solution sprinkled 

 over surface of soil af- 

 ter seeding. 



Sprinkled over surface 

 of soil after seeding. 

 No treatment 



Scattered in row with 

 seed. 



plot 3b where nicotine sulphate was applied, there was an increase of 

 224 plants over the stand on check plot 3. Attention is directed to 

 the even stand in both center and side rows of the plot which received 

 this treatment. There was also a decided gain on plot 4a. This sec- 

 tion was treated with a 2 per cent nicotine dust made by sprinkling 

 nicotine sulphate on hydrated lime. 



Effect on Germination:- Sodium cyanide at the rate of 250 pounds 

 to the acre, as used on plot lb, did not prevent germination but check- 

 ed it to some extent. Where used at the same strength on plot Id 

 the cyanide caused no injury, which was due to the difiference in 

 method of application. Creosote oil 1-25 and 1-50 and cresylic acid 



