238 SECOND THOUSAND QUESTIONS IN AGRICULTURE 



Destroy affected plants as soon as they first appear. Spray often 

 with weaker Bordeaux. Rotate crops. 



Anthracnose. Forms circular dead spots on the leaves and long 

 shrunken areas on the stems. The fruits of the watermelon are often 

 badly spotted by this disease. Spray with weaker Bordeaux as soon 

 as fungus appears. 



Common Wilt. Produces a sudden wilt of the vines by stopping 

 up the water carrying vessels of the stems. Destroy infected plants 

 as soon as infection appears. 



Fusarium Wilt. Can be handled only by crop rotation. 



Powdery Mildew of the Cucumber. Attacks other members of 

 this group also. Forms a white powdery coating on the leaves and 

 stems and soon kills the plants. Spray as soon as it first appears 

 with weak Bordeaux. 



Celery, Carrots, Parsnips. 



Celery Leaf-tyer. Destroys foliage, and its presence may be told 

 by the many leaves which are curled and fastened together by this 

 insect. It is particularly bad in greenhouses. Spray with Paris green 

 or lead arsenate not later than three weeks before marketing crops, 

 because of the danger of poisoning. Hand pick. 



Celery Blight, Early Blight. Produces spots upon the leaves, 

 causing them to turn yellow, to wilt, and finally kills them. This 

 disease also affects parsnips, and usually appears early in the season. 

 Spray early and repeatedly with weak Bordeaux. 



Late Blight. Produces rusty brown spots upon the leaflets 

 which may rapidly spread to cover the entire foliage. Spray with 

 weak Bordeaux throughout the season. 



Asparagus. 



Asparagus Beetle. Dust air slacked lime upon the plants when 

 they are wet with dew. Apply lead arsenate dry. As a repellent 

 spray with hellebore in water. 



Asparagus Rust. Attacks the bushy tops, producing black and 

 red rust, the latter being the destructive stage. Keep the plants cut 

 back until July 1st. Apply 150 to 200 pounds of sulphur, dry, per 

 acre, three weeks after cutting- tops and before rust appears. Make 

 the applications in the morning when the plants are wet with dew, or 

 first spray with weak Bordeaux. 



Corn, Sorghum. 



Corn Worm. Is hard to deal with because it works on the ear 

 in the husk. It is best handled by the rotation of crops, late plowing 

 followed by harrowing to destroy the pupae in the soil, and by plant- 

 ing crop as early as possible to assure rapid growth. (See page 31.) 



