58 HORTICULTURIST'S RULE-BOOK. 



SCALD. Attacking the fruit early in the season, at first pro- 

 ducing a scalded appearance, and later decay. 



Remedies. Sanding or earthing the bog an inch deep, 

 and keeping water off in summer, are partial remedies. 

 Cucumber. BLIGHT. A bacterial trouble, causing the entire 

 vine, or a branch of it, to droop and die. No remedy is 

 known. 



MILDEW (Erysiphe Cichoracearum, DC.). A white mold- 

 like mildew which appears in spots upon the upper surface 

 of the leaves of cucumbers, especially under glass. 



Remedies. Evaporated sulphur. Spray with ammoni- 

 acal carbonate of copper. 

 POWDERY MILDEW. See under MUSKMELON. 

 Currant. ANTHRACNOSE (Glceosporium Ribis, M. & D.). 

 Small, dark brown or blackish spots chiefly on the upper sur- 

 face of the leaves, but within the tissues. The cuticle over 

 the spots is pushed up, giving the spots a whitish blister-like 

 appearance. The leaves finally turn yellow, and they fall 

 in July and August. 



Preventive. Thorough application of Bordeaux mixture. 

 RUST or LEAF-SPOT (Septoria Ribis, Desm.). Appears 

 about midsummer, on leaves of white, red, and black 

 currants, as whitish spots with black centres. It causes 

 the leaves to fall. Another spot disease is caused by Cerco- 

 spora angulata, Wint. 



Remedies. Destroy infested leaves. Spraying with 

 Bordeaux mixture and carbonate of copper, as for grape- 

 rot. 



Damping-off. A term applied to the decay of young seed- 

 lings and cuttings at or near the surface of the ground. 

 The trouble is undoubtedly due to a great variety of 

 causes, but it is thought to be oftenest the work of fungi, 

 particularly Artotrogus DeBaryanus. Phytophthora Cacto- 

 rum (or Pythium omnivorum) causes a similar disease of 

 small seedling trees. It is probably sometimes due to some 

 fungus which exists in the seed, and in such cases if they 

 could be determined soaking the seed in carbonate of 



