20 



pupae, and the adult flies emerge a little later. There are several broods 

 in a season. 



*gg$£ZB % 



Oxion Maggot. 



Remedies : Crude Carbolic Emulsion, as for the Cabbage root mag- 

 got, sprinkle along the rows over the plants once a week ; horse-hoe a fur- 

 row away from the plants, in which nitrate of soda is distributed, and 

 cover with earth; remove diseased plants, and destroy maggots; white 

 hellebore dusted along the rows once a week from the time the young 

 plants appear above ground ; fresh gas lime broadcasted between rows of 

 onions at the rate of two hundred weight to the acre. 



Thrips (Thrips tabaci) : Very minute insects, about one-twenty-fifth 

 of an inch in length, of a pale yellow color, with darker-colored wings. 



. 



Onion Thkips ( Thrips tabaci). a. adult female ; b. antenna of same ; c. young 

 larva or nymph ; d. full grown larva. All enlarged. 



(After Howard, Division of Entomology, U.S. Dept. of Agriculture, Yearbook 

 for 1898.) 



They occur in very large numbers, and the injury is visible in the 

 form of small yellow spots, increasing in size until the tips of the leaves 

 become yellow or brown ; the whole stalk finally having a whitish appear- 

 ance, and, if the weather is wet, the leaves decay. 



Remedy : Spray with kerosene emulsion, used at the rate of one part 

 of the emulsion to ten of water. 



