MISCELLANEOUS INSECTICIDE INVESTIGATIONS. 



Table IX. — Tests of the hilling effect of various poisons on the tussock moth. 

 [Experiment started June 26, 1913, Benton Harbor, Mich.; 25 larvae in each lot.] 



17 





Name and dilution. 



Dates of examina- 

 tion and larvae 

 dying in each lot. 



e3 

 O 



■o 



t-t 

 a 

 ,Q 



a 



3 

 a 



"a 

 

 Eh 



TJ O 



sg, 



3 



« 



to 

 .2 



/3 • 

 "-■■a 



* a 



•a a 



«> 9 



d 



o 

 >1 



June. 



July. 



28 



30 



2 



4 



6 



3 



m 



1 



Arsenate of lead paste, commercial, 2-50 



13 

 15 

 11 

 13 

 7 



18 



10 



16 



17 



4 



2 



5 



9 



10 



6 



10 



4 



17 















10 



12 



5 



8 



6 



8 















12 



10 



11 



12 



18 



7 



15 



9 



8 



11 



3 



8 



7 



7 



15 



6 



17 



7 



9 



6 



5 



10 



9 



15 



15 



9 



8 



1 







2 









25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 25 

 3 

 3 

 4 



4 

 4 

 6 

 4 

 4 

 4 

 4 

 4 

 4 



10 

 8 

 8 



10 

 8 

 6 



10 

 8 

 6 

 6 

 8 

 6 

 8 

 8 

 8 



10 

 8 

 8 



0.06 



2 



do 









.01 



3 



do 



3 







.08 



4 



Arsenate of lead powder, commercial (1), 1-50. . 







.01 



5 



do 









.05 



6 



do 









.02 



7 



Arsenate of lead powder, commercial (2), 1-50 









.07 



8 



do 









.04 



9 



do 









.02 



10 



Arsenate of calcium paste, commercial, 1^-50 



1 

 7 



10 

 4 

 4 

 4 

 1 

 3 

 1 

 16 

 16 

 20 

 1 

 1 

 

 

 8 

 3 

 

 

 



5 

 13 

 2 



2 

 4 



4 

 "3" 



.50 



11 



do 



.68 



T> 



do 



.42 



n 



Arsenate of calcium, homemade (1), 0.8-50 



.20 



14 



do 



.38 



15 



do 



.15 



16 



Arsenate of calcium, homemade (2), 0.8-50. . . 





 1 



5 



.10 



17 



do 



.23 



IS 



do 



.06 



19 



Lead chromate, commercial, 8-50 







.55 



?0 



do 



3 





.20 



?1 



do 



.18 



m 



Arsenate of zinc, homemade, 0.8-50 



4 

 3 

 5 

 1 

 2 

 6 

 

 3 

 2 



.... 



"2 

 







.46 



?3 



do 



.38 



?4 



do 



.62 



?s 





.60 



?fi 



do 



.74 



?7 



....do 



.72 



28 



Check (unsprayed) 



5.80 



W 



do 



7.20 



30 



do 



5.55 









Experiment X. 



FIELD TFSTS OF VARIOUS ARSENICALS AGAINST THE CODLING MOTH, 1913. 



Field tests were made with the following preparations against the 

 codling moth on apple: Arsenate of lead paste, commercial; arsenate 

 of calcium paste, commercial; arsenate of calcium, homemade, pre- 

 pared from sodium arsenate and calcium acetate; arsenate of cal- 

 cium, homemade, prepared from sodium arsenate and calcium 

 chlorid; arsenite of zinc powder, commercial; and arsenate of zinc, 

 homemade. (For methods of preparation of the homemade mate- 

 rials, see p. 2.) All the materials were used in combination with 

 lime-sulphur, 1^ to 50. The spraying was done in Mr. J. T. Beck- 

 with's orchard in the vicinity of Benton Harbor, Mich., the same 

 orchard that was used for the experimental work of the previous 

 season. The results of this experiment are shown in Table X. 

 98119°— Bull. 278—15 3 



