49 



Result, five days later, plant and grub alike uninjured. A second 

 application killed the plant but not the grub. 



Experiment No. 3. — Placed grub about root of plant May 14; two days 

 later applied fresh unleached ashes to surface of ground in sufficient 

 quantity to cover lightly. 



Result, five days after, plant and grub alike uninjured. 



Experiment No. 4. — Single grub placed about roots of plant May 14; 

 two days later applied 4 ounces gas-tar water. 



Result, next day, plant killed; grub uninjured. 



Experiment No. 5. — Single grub placed about roots of plant May 14; 

 two dav s after earth about roots thoroughly saturated with tobacco water. 



Result, five days after, plant and grub alike uninjured. 



Experiment No. 6. — Single grub placed about roots of plant May 14 ; 

 two days later applied 1 drachm Diamond soluble bone* in solution. 



Result, six days later, plants and grub unaffected by application ; 

 grub eating off the roots. 



Experiment No. 7. — Grub placed about roots of plant May 14 ; two 

 days later J ounce carbon bisulphide poured in hole made in earth near 

 roots and immediately refilled with earth. 



Result, second day after, plant and grub both dead. 



Experiment No. 8. — Single grub placed about roots of plant May 14; 

 two days after thoroughly saturated the soil with ammonial water of 

 1.025 specific gravity, 2.68 per cent, ammonia reduced 75 per cent. 



Result, three da}~s after, plant killed but the grub was alive and active. 



Experiment No. 9.* — One grub placed about roots of plant May 22 

 and one drachm of phosphate salt applied in solution to the soil about 

 roots. On 23d, corn was being destroyed by the grub and the next day 

 the plant was wholly eaten off while his grubship appeared uninjured. 



Experiment No. lO.f — Single grub placed about roots of plant and one 

 drachm of fertilizing salt applied in solution to soil about roots. 



Result, two days later, plant withering, grub all right but had not fed 

 from plant which soon died. 



Experiment No. 11. — Grub placed about roots of plant May 22 ; soil 

 at once saturated with solution of powdered Pyrethrum and water ; 

 1 ounce of powder to gallon of water. 



Result, two days later, neither plant nor grub injured. 



Experiment No. 12. — Grub placed about roots of plant May 22 ; next 

 day the soil about the roots was drenched with decoction of Burdock 

 leaves. 



* Analysis : Per cent. 



Available phosphoric acid 13 to 15 



Insoluble phosphoric acid 1 to 3 



Total - 15 to 17 



Ammonia i to 1 



TThe phosphate salt and fertilizing salt used in experiments 9, 10, and 14, were sent 



to the Indiana experiment station by the manufacturer, E. S. Fitch, Bay City, Mich., 



23479— No. 22—4 



