56 CANADIAN FARM YEAR BOOK. 



FORMULAE FOR INSECTICIDES 



I. — POISONS (for biting insects only). 



1.— ARSENATE OF LEAD — 2 or 3 lbs. to 40 gallons liquid spray; 3^^ lbs. 

 for potato beetles. 



2. — PARIS GREEN — (a) Vi to % lb. to 40 gals.; 1 lb. for potato beetles. 

 If used with water alone, add 1 to 2 lbs. fresh lime, (b) 1 lb. mixed with 

 50 lbs. land plaster, air-slaked lime or some similar substance, for dust- 

 ing on plants, (c) Poisoned bran, mix 1 lb. Paris green with 50 lbs. 

 bran moistened with sweetened water. Scatter in evening on soil by 

 plants for cutworms. 



3. — ARSENATE OF LIME. — Boil 1 lb. white arsenic and 1 lb. sal. soda 

 (crystals) with stirring for about 15 minutes in 1 gal. water till the 

 arsenic is dissolved, then add 2 lbs. stone lime and let slake in boiling 

 liquid. Add water to make up for what has evaporated. One quart of 

 this when well stirred is sufficient for 40 gals, spray liquid. Arsenate 

 of lime can be made in large quantities and stored. Label barrel 

 "poison," and be careful to keep white arsenic itself labelled "poison. ' 

 Keep barrel covered to prevent evaporation. Stir well before using. 



N.B. — ^With Bordeaux, 1, 2 or 3 may be used; with lime-sulphur 1; the 

 others cause burning. 



4.— WHITE HELLEBORE.— 1 oz, to 2 gals, water, or dust undiluted over 

 the plants. For root maggot dust close to plants, or pour around roots. 



II.— CONTACT POISONS (chiefly for sucking insects). 



1.— KEROSENE EMULSION— 



Kerosene (coal oil) 2 gals. 



Rain water 1 gal. 



Soap % lb. 



Dissolve the soap in water by slicing and boiling; take from fire, and 

 while hot pour in kerosene and churn "vigorously for five minutes. For 

 use dilute with 9 parts water, so that the above 3 gals, of stock emul- 

 sion will make 30 gals, of spray mixture. 



2.— WHALE-OIL SOAP.— For brown or black aphids, 1 lb. in 4 gals. For 

 green aphids, thrip and leaf-hopper, 1 lb. in 6 gals. 



3.— TOBACCO WATER.— Steep 1 lb. refuse tobacco in 2 gals, of water for 

 1 hour, make up for water that evaporates. 



4. — Black leaf 40, sold by Tobacco Product Co., Louisville, Kentucky. 



5.— PYRETHRUM (or insect powder). 



Pyrethrum Powder 1 oz. 



Water 2 to 3 gals. 



Dry mixture. Mix thoroughly 1 part by weight of pyrethrum with 4 of 

 cheap flour, and keep in air-tight vessel for 24 hours before dusting over 

 plants. 



Note. — Pyrethrum is useless if left exposed to the air. 



6.— LIME-SULPHUR WASH— 



(See under fungicides.) 



