. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. 1 _>--/.5iE^i*'. Fig. 69. Niagara carbonic acid gas sprayer. 4 parts of water for scale insects and with about twice as much water for plant-lice and other suck- ing insects. Pumps have been designed for combin- ing the oils and water into a good mechanical emul- sion, but usually the percentage of oil can not be satisfactorily controlled. So-called soluble or miscible oils
. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. 1 _>--/.5iE^i*'. Fig. 69. Niagara carbonic acid gas sprayer. 4 parts of water for scale insects and with about twice as much water for plant-lice and other suck- ing insects. Pumps have been designed for combin- ing the oils and water into a good mechanical emul- sion, but usually the percentage of oil can not be satisfactorily controlled. So-called soluble or miscible oils which quickly emulsify with water are now made and are very effective against scale insects. A lime, salt and sulfur mixture (often without the salt) is a very effective and safe spray to use on dormant plants for the San Jose scale and the peach leaf-curl fungus. This " wash " is made by boiling for about an hour 15 pounds of flowers of sulfur and 20 pounds of stone lime in 50 gallons of water; by using about 6 pounds of caustic soda this " wash " can be made without boiling and is nearly as effective, but costs more. Fumigation. Both sucking and biting insects succumb to the fumes of carbon bisulphid or to hydrocyanic acid gas. Carbon bisulphid is largely used in killing insects infesting stored grains or seeds. It is poured into shallow dishes set on top of the grain in tight bins, or it may be sprinkled over the grain. The fumes are heavier than air and sink all through the grain ; as the fumes are explosive, no lights should be near. A little of the liquid poured on clothing stored during the summer will kill the destructive clothes moths. Cucurbitaceous vines have been covered with cloth and successfully treated for plant-lice with carbon bisulphid. Hydrocyanic acid gas is generated by dissolving cyanide of potassium in sulfuric acid and water. It is used largely under tents by the citrous orchard- ists in California for scale insects, and by many nurs
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