236 SECOND THOUSAND QUESTIONS IN AGRICULTURE 



drilled into the soil at the rate of 150 pounds per acre has given good 

 results: lime 50 pounds mixed with sulphur 100 pounds. Also treat 

 seed with formalin as they are being drilled into the soil. 



Cabbage, Cauliflower, Kale, Turnip, Radish, Mustard. 



Harlequin Cabbage Bug. Attacks all cruciferous plants, culti- 

 vated and uncultivated, as well as many other hosts. It is no little 

 difficulty to keep these insects from taking a crop, but by observing 

 the following they may be held in check: Keep weeds from the fields 

 at all times; plant late trap crops of kale or cabbage and burn them 

 when they become infested, or kill the bugs with pure kerosene. 

 Hand pick adult insects as soon as they first begin to appear. Spray 

 with kerosene emulsion. 



Cabbage Aphis. Attacks a wide range of cruciferous plants, 

 cultivated and uncultivated. In time, it is subdued by parasitic and 

 predacious enemies, but often not until it has done great damage. It 

 can be controlled by spraying with emulsions or tobacco washes. 



Cabbage Worms. These green worms do great damage by de- 

 stroying, for market, great quantities of cabbage and cauliflower. As 

 a repellent apply white hellebore; as an insecticide apply resin wash. 



Club Root. A disease producing peculiar enlargement of the 

 roots, giving the plants an unhealthy appearance and finally causing 

 their death. The disease may be carried over in the soil, so the 

 following has been recommended as a means of control: Lime the 

 soil at a rate of 100 bushels per acre, every few years. Rotate crops. 

 Employ clean culture methods. 



Black Rot. A bacterial disease first producing a burnt margin 

 on the leaves and finally causing them to drop. The disease is readily 

 carried from year to year in the seed. Before planting treat the seed 

 with corrosive sublimate or formalin. Eliminate infected plants as 

 soon as they appear in the beds. Rotate crops. 



Tomato, Potato, Egg-Plant, Tobacco, Etc. 



Tomato Worms. These large green caterpillars feed upon the 

 foliage and are easily recognized. Due to their large size, it is very 

 effective to hand pick the infested area. If very numerous spray 

 with arsenate of lead. 



Flea Beetle. A very small beetle which works on the leaflets. 

 'As a repellent spray with weak Bordeaux; for an insecticide, arsenate 

 of lead. 



Twelve Spotted Cucumber Beetle. A small green beetle with 

 twelve black spots on the elytra. The larvae work on a great variety 

 of plants. Spray with arsenate of lead. 



Winter Blight or Downy Mildew. Attacks nearly all of the 

 plants of this family, killing the leaves and injuring the tubers. Plant 

 clean seed. Disinfect doubtful seed with formalin. Spray plants 

 with Bordeaux as soon as symptoms first appear. 



