19 



Plant Lice. 

 Spray with No. 22, or use No. 24 or 25. 



Red Spider. 



Spray frequently with clear water or soap (No. 22). Spray 

 plants not affected by sulfur with flowers of sulfur 1 ounce, 

 water 1 gallon, and soap enough to make the sulfur mix with 

 the water. 



Thrips. 

 Fumigate with strong tobacco extract vaporized. Repeat as 

 needed. 



White Fly. 

 Fumigate with hydrocyanic acid (No. 27), but use only .007 

 to .01 gram of cyanid per cubic foot, according to how tight 

 the house is, with the corresponding amounts of acid and 

 water. Fumigate for three hours at night and repeat twice 

 at intervals of fourteen days. Use this treatment with some 

 caution. 



Eel Worms. 

 Freeze, sterilize or change the soil. 



Onion. 



Onion Maggot. 



Apply No. 10 as soon as the plants are up, wetting the ground 

 well around them for 2 or 3 inches. Repeat once a week for 

 about three times. No satisfactory treatment for large fields 

 has vet been found. 



Smut. 



Wet the seed before sowing, with 1 pint of formalin in 30 

 gallons of water. A drip attachment to the seeder will do this. 



Thrips (Blight). 



Collect all refuse in the field as soon as the crop is gathered, 

 and burn it. Burn over all grass land and rubbish around 

 onion fields during late fall, as the thrips winter in such places, 

 and burning destroys large numbers of them. 



