EXPERIMENT STATION BULLETINS. 197 



patches on the potato tops, usually on the underside of the leaves, and 

 the larvae feed openly on the foliage until full grown, descending into 

 the soil to change to naked, yellowish or orange colored pupae. After 

 a short time, these pupae transform into the adult beetles which ascend 

 to the surface and feed with the larvae, laying the eggs for another gen- 

 eration, the last generation, for the most part remain in the soil over 

 winter as adults, and come forth in the spring in time to attack the 

 early potatoes just as they come up. 



REMEDIES. 



Tlie ease with which the potato-beetle responds to the arsenites is so 

 well known that it seems almost superfluous to discuss the question at 

 all. Paris-green, arsenite of lime, Kedzie mixture and others work 

 admirably. Paris-green may be used either as a spray or as a dry 

 • powder. The spray has been in favor for many years. It is economical, 

 and when prepared with lime, about as safe as can be desired. It should 

 be applied in rather a stronger mixture than when used for fruits — say 

 one pound to 125 gallons of water or even 100 gallons. Arsenite of 

 lime and Kedzie mixture are both cheay)er than paris-green, but white 

 arsenic looks too much like flour and other articles of food to be stored 

 about the house, then too, the work of preparation counterbalances the 

 saving unless the work is done on a very large scale, and in any case 

 special keetles should be provided for boiling. London purple contains 

 more free arsenious acid and is less apt to be uniform in composition 

 than paris-green. 



INSECTS AFFECTING THE RADISH. 



INSECTS AFFECTING THE ROOTS. 

 Radish-maggot or Cabbage-maggot {Phorbia irassicae). 



Everyone that raises radishes, knows of the little maggots that tunnel 

 in the roots. These are the same maggots that work in cabbage roots, 

 being then known as cabbage-maggots. For further information con- 

 cerning the appearance and life-history of this insect see Insects affect- 

 ing Cabbage. 



REMEDIES. 



The best remedy for the maggot when working in radish, seems to be 

 the carbolic-acid emulsion, diluted about thirty times with water. 

 Sprinkle this along the rows of radishes about once a week. The odor 

 drives away many of the flies that come to lay their eggs. 



In Canada, they have had some measure of success with cloth covered 

 frames used as a protection. Light frames, three to six feet high, en- 

 closed on all sides with cheese cloth, are placed over the beds. The 

 flies are said to leave such protected plants alone. If this proves suc- 

 cessful, it will solve the question in the small kitchen garden at least. 

 In the large market garden it is possible that the expense may eat up 

 the profits. 



INSECTS AFFECTING THE FOLIAGE. 



Cucumber-beetle (see Insects affecting the Cucumber). 



