58 horticulturist's rule-book. 



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

 ducing a scalded appearance, and later decay. 



Bemedies. — 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 C ichor acearum, DC). — A white mold- 

 like mildew which appears in spots upon the upper surface 

 of the leaves of cucumbers, especially under glass. 



Bemedies. — Evaporated sulphur. Spray with ammoni- 

 acal carbonate of copper. 

 Powdery Mildew. — See under Muskmelon, 

 Currant. Anthracnose (^Glceosporium Bibis, 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 Bibis., 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. 



Bemedies. — Destroj'- 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 



