26 



BULLETIN 278, U. S. DEPARTMENT OP AGRICULTURE. 



Table XV. — Aphis poini, contact insecticide experiments. 

 [Benton Harbor, Mich., 1914.] 



Lot 

 No 



Name and dilution. 



Per cent of aphides killed. 



Test 1, 



Aug. 20, 



p. m. 



Test 2, 

 Aug. 21 



Test 3, 

 Aug. 21 

 p. m. 



Test 4, 



Sept. 



17. 



10 



11 



12 

 13 

 14 

 15 

 16 



U7 



18 



19 



20 

 21 

 22 

 23 



24 

 25 



Nicotine sulphate (Com. No. 1), 40 per cent, 1-800 



Nicotine sulphate (Com. No. 1), 40 per cent, 1-800+laundry soap, 



3-50 



Nicotine sulphate (Com. No. 1), 40 per cent, 1-1,200+laundry soap, 



3-50 



Nicotine sulphate (Com. No. 1), 40 per cent, 1-1,600+laundry soap, 



3-50. 



100 

 100 



Nicotinesulphate(Com.No. 1), 40 per cent, 1-2,000+laundry soap, 

 3-50 



Nicotine sulphate (Com. No. 1), 40 per cent, 1-800+ arsenate of lead 

 paste, 2-50 



Nicotine sulphate (Com. No. 1), 40 per cent, 1-800+arsenateoflead 

 paste, 2-50+laundry soap, 3-50 



Nicotine sulphate (Com. No. 2) , 40 per cent, 1-800 



Nicotine sulphate (Com. No. 2), 40 per cent, 1-800+ arsenate of lead 

 paste, 2-50 



Nicotine sulphate (Com. No. 2), 40 per cent, 1-800+laundry soap, 

 3-50. 



Nicotine sulphate (Com. No. 2). 40 per cent, 1-800+laundry soap, 



3-50+arsenate of lead paste, 2-50 



Kerosene emulsion (66 per cent stock), 1 per cent 



Kerosene emulsion (66 per cent stock), 3 per cent 



Kerosene emulsion (66 per cent stock), 5 per cent 



Kerosene emulsion (66 per cent stock), 10 per cent 



Kerosene emulsion (66 per cent stock), 10 per cent+arsenate of 



lead paste, 2-50 



Kerosene emulsion (66 per cent stock), 10 per cent+arsenate of 



lead paste, 2-50 



Kerosene emulsion (66 per cent stock), 10 per cent+arsenate of 



calcium, commercial paste, 2-50 



Kerosene emulsion (66 per cent stock), 10 per cent+arsenate of 



calcium, commercial paste, 2-50 



Anthracene emulsion (66 per cent stock), 5 per cent 



Anthracene emulsion (50 per cent stock), 3 per cent 



Anthracene emulsion (50 per cent stock), 1 per cent 



Laundry soap, 3-50 



Laundry soap, 5-50 



Nicotine sulphate (Com. No. 1), 40 per cent, 1-800+ arsenate of 



lead paste, 2-50+lime-sulphur, 1^-50 



Nicotine sulphate (Com. No. 2), 40 per cent, 1-800+ arsenate of 



lead paste, 2-50+lime-sulphur, 1^-50 



Arsenate of lead paste, 2-50 



Naphtha soap, 3-50 



Naphtha soap, 5-50 



Kerosene emulsion (50 per cent stock — made with naphtha soap, 



cold water), 10 per cent 



Kerosene emulsion (50 percent stock — made with naphtha soap, 



cold water), 5 per cent 



Kerosene emulsion (naphtha soap, cold water), 10 per cent 



Anthracene emulsion (50 per cent stock — made with naphtha soap, 



cold water), 3 per cent 



Anthracene emulsion (50 per cent stock— made with naphtha soap, 



cold water), 1 per cent 



Fish-oil soap, 3-50 



Fish-oil soap, 5-50 



Nicotine sulphate (Com. No. 2), 40 per cent, 1-1,200+laundry soap, 



3-50 



Nicotine sulphate (Com. No. 2), 40 per cent, 1-1,600+laundry soap, 

 3-50 



Nicotine sulphate (Com. No. 2), 40 per cent, 1-2,000+laundry soap, 

 3-50 



Check (unsprayed) 



100 



100 

 100 



100 



100 



100 



100 

 100 



295 



100 

 100 



3 100 



100 



100 

 



100 

 100 



100 

 100 



100 



100 



100 



100 

 100 



100 



100 

 '100 



100 



100 

 *10 



100 

 100 



100 



100 

 100 



100 



100 



100 



100 

 100 



100 



100 

 '100 



100 



100 

 



1 Stood combined several days before usage. 



2 A few adults not killed. 

 8 Foliage severely burned. 

 * Adult aphides not killed. 

 b No adult aphides killed. 



As will be noted in Table XV, the majority of the materials proved 

 effective aphidicides. Thus it will be seen that several combinations 

 may be used with good effect when it is aimed to control both chew- 



