CONTROL OF GARDEN DISEASES AND INSECTS. 



39 



Control. — Re.sistaiit varieties are being bred. Until these arc avail- 

 able, practice the same treatment as for black-leg. 



IJLACK-KOT. 



In black-rot, dead brown areas 



appear on 

 progresses 



Fig. 43.— Cabbage black- 

 rot. Cross section of 

 stem of diseased plant, 

 showing blackened 

 ring. 



the leaf margins. The disease 

 downward through the veins, Avhich are black- 

 ened. The inner wood of the stem is dark. 

 (Fig. 43.) The heads are dwarfed or one-sided, 

 and later may decay and fall off. 



Control is difficult. Use the same preventive 

 measures as for black-leg. Keep insects, slugs, 

 snails, etc., in subjection, as they may spread 

 the disease. Pull or destroy diseased plants, 



CLXTBROOT. 



The plants may be attacked by clubroot in the seed bed or later. 

 They are stunted, sickly, and wilt during the heat of the day. The 

 roots become greatly swollen and malformed. (Fig, 3, p, 6,) This 

 disease also attacks turnips, caulifloAver, mustard, and other culti- 

 vated and wild plants of the cabbage family. 



Control. — Apply lime, pref- 

 erably air slaked, at the rate of 

 40 pounds per square rod, work- 

 y . ing it deep into the soil several 



months before planting. Take 

 special care that the seedlings 

 are healthy. Destroy diseased 

 plants. 



The heads go down rapidly in 

 the field, especially in warm 

 weather, \vith a soft rot. Har- 

 vest early and avoid replanting 

 the same spot. 



CELERY. 



LEAF-BLIGHT. 



Fiu. 44.~ceieiy leaf-blight. Leaf -blight is a spotting of 



the leaves (fig. 44). There are two forms, the early and the late, due 

 to different fungi, but controlled by the same means. Spray 

 the celery in the seed bed with Bordeaux mixture and repeat every 10 

 to 14 davs until the celery is mature. 



