INJURIOUS INSECTS OF 1903. 117 



The potash, sulphur and salt may be mixed together 

 in a large metal tub with a little water; the chemical ac- 

 tion will make it boil. For spraying dilute with 100 times 

 as much water. It is used against the active stages of the 

 red spider. Three applications at intervals of one week 

 kills the eggs and moulting forms. (Cal. Bui. 145, 1902.) 



A solution, which loses strength upon standing, is 

 made by mixing ^ to i ounce potassium sulfid (Liver 

 of Sulphur) in one gallon of water. It is used against 

 surface mildews of gooseberry (Cornell Bui. 188, 1901), 

 rose, etc. 



44. Pyrethrum — 



This is the ground-up flowers of the Pyrethrum plant. 

 It loses strength unless kept in a tight can or jar. When 

 burned in a room it will destroy mosquitoes, flies, fleas, 

 cockroaches, etc. It may be used as a spray, 100 grains 

 of powder to 2 gallons of water. 



45. Resin Bordeaux — (See under Resin Lime Mixture.) 



46. Resin Lime Mixture — 



As a fungicide or an insecticide this mixture is not of 

 itself very useful. Some plants, however, have a smooth, 

 glossy epidermis ; the Resin Lime Mixture, added to a reg- 

 ular fungicide or insecticide, acts as a carrier, and insures 

 the sticking of the necessary poisonous ingredients. 



Formula: 



Pulverized resin, 5 pounds; 



Concentrated lye, i pound ; 



Fish or other animal oil, i pint ; 



Water, 5 gallons. 

 Place the oil, resin and one gallon of hot water in an 

 iron kettle and heat until the resin softens. Then add the 

 lye and stir thoroughly. Now add 4 gallons of hot water 

 and boil until a little will mix with cold water and give 

 a clear, amber-colored liquid. Add water to make up to 

 5 gallons. Keep this as stock. 



