ROSE — SPINA CH 28 1 



Control — Steam-sterilize the soil before planting. 

 Club-root. — See under Cabbage (p. 266). 

 Raspberry. Anthracnose {Glceosporium ye/ie^wm). — Circular or 

 elliptical, gray scab-like spots on the canes. 



Control. — Avoid taking young plants from diseased plantations. 

 Remove all diseased canes as soon as the fruit is picked. Practice 

 frequent rotation. 

 Crown-gall or Root-gall {Bacterium tumefaciens) . — Tumorous 

 outgrowths on the roots, especially on red varieties. It is con- 

 tagious and destructive. 



Control. — Never set plants which have galls on the roots. 

 Avoid setting on infested land. See under Peach (p. 276). 

 Red or Orange rust {Gymnoconia inter stilialis) . — k dense red 

 powdery growth on the under side of the leaves of bhick varieties 

 and of blackberries. The fungus hibernates in the roots. 

 Control. — Dig up and destroy infected plants. 

 Rice. Blast, Blight or Rotten-neck (Piricularia oryza;). — An ex- 

 tensive paling and drying of leaf and stem, and a partial failure 

 of the heads to fill. 



Control. — The selection of early maturing varieties is advis- 

 able. Burn stubble and trash left in the fields. 

 Rose. Black leaf-spot {Actinonema rosce). — Attacks the full-grown 

 leaves, first appearing as small black spots, but later covering 

 nearly or quite the whole surface with blotches. The spots have 

 frayed edges. 



Control. — Spray with ammoniacal copper carbonate, beginning 

 with the first appearance of the spots and continuing at intervals 

 of one week until under subjection. 

 Mildew {Sphcerotheca pannosa). — A white powdery mildew on the 

 new growth. 



Control. — For greenhouse roses keep the steam pipes painted 

 with a paste made of equal parts lime and sulfur mixed with 

 water. Out-of-door roses should be dusted with sulfur flour 

 or sprayed with potassium sulfid, 1 ounce to 3 gallons of 

 water. 

 Spinach. — There are numerous fungous diseases of this crop, but a 

 practical method of control has not been developed. The best 

 that can be done is to rotate crops. 



