320 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



soil immediately around the plants with a sprinkling can. This 

 has proven quite effective for cabbage in New Jersey, but in 

 Minnesota cabbage so treated showed but little benefit, though 

 radishes were somewhat protected. Kerosene and sand, gas 

 tar and sand, tobacco dust and many other substances have been 

 used to place around the plant and act as repellants or preven- 

 tives, but all have some objection or have not been sufficiently 

 tested to show their effectiveness and practicability. Dr. J. B. 

 Smith reports, however, that cauliflower-growers at Richfield, 

 N. J., have been using gas tar, 1 part to 25 parts of sand, for 



several years with good re- 

 sults. The gas tar costs $1.25 

 a gallon and will treat 1000 

 plants. A greater propor- 

 tion of gas tar has proven 

 injurious. 



Remedies. A successful 

 treatment for the maggot 

 has recently been discov- 

 ered. This consists of the 

 use of corrosive sublimate 

 in solution at the strength 

 of one ounce to ten gallons 

 of water or in dust form 

 mixed with hydrated lime 

 or gypsum at the rate of one 



(D 



FIG. 269. a, tarred felt card in outline 

 one-third size; 6, tool for cutting 

 cards, about one-sixth size; c, show- 

 how tool is used, dotted line 



mg now tool is usea, aottea ime 



indicating position of edge of tool, ounce to six pounds of the 



carrier. The liquid is ap- 



(After Goff.) 



plied to the plants at the time the eggs are seen or soon after 

 setting out the plants and again about ten days to two weeks 

 later. Use three or four ounces of the liquid to each plant. For 

 radishes apply when the plants are about two inches high and 

 use at the rate of a gallon to twenty- five feet of row. The dust 

 poison is mixed in the soil at the base of the plant, about a tea- 

 spoonful being used for each plant. 



Carbolic acid emulsion has been used with some success as 

 has hellebore decoction but neither is as satisfactory as the above 

 described treatment. 



Carbon bisulphide injected into the soil has given some suc- 

 cess but will scarcely be recommended now. 



