632 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Canna Leaf-Roller, The Larger. By F. H. Chittenden, Sc.D. 

 {U.S.A. Dep. Agr., Bur. Eiitom., Circ. 145; March 1912; 8 figs.).-^ 

 This leaf-roller is the hirva of a butterfly {Calpodes ethlius, Cram.) of 

 tropical origin, ^nd has done considerable damage to decorative Cannas 

 growing in public parks and private gardens in the vicinity of 

 "Washington and many parts of the States. Cannas with brown leaves 

 are more prone to attack than the green-leaved varieties, probably on 

 account of the toughness of the latter. Hand-picking and spraying 

 with arsenicals is recommended by the author, who emphasizes the fact 

 that whatever method of control is used, it should be done early in 

 the season. — V. G. J, 



Ceratonia siliqua, To Hasten Germination of the Seeds of 



(Bev. Hort. d'Alg. p, 433; Dec. 1911). — To produce rapid germina- 

 tion of the seeds of the Ceratonia siliqua throw them into water just 

 as it reaches boiling-point, then draw the vessel away from the fire 

 and let the seeds soak for twenty-four hours. Afterwards sow in 

 drills in well- worked soil. Water frequently until the first leaves 

 appear, when the watering should be reduced. — M. L. H. 



* 



Chestnut Blight Fungus. By C. L. Shear {PhytopatJwlogy, 



ii. pp. 211-212; Oct. 1912). — The author has examined numerous 

 specimens of the fungus Endothia radicalis, which he has collected on 

 the dead stumps of the sweet chestnut, and concludes that the fungus 

 known hitherto as Diaporthe parasitica, and parasitic in America, is 

 identical with it. — F. J. C. 



Chestnut Blight Fungus and a related Saprophyte. By 



P. J. x\nderson and H. W. Anderson {Phytopathology , ii. pp. 204-210; 

 Oct. 1912). — The authors discuss the nomenclature of the fungus 

 hitherto known as Diaporthe parasitica, and come to the conclusion 

 that more than one fungus has been confused under this name. They 

 assign the true fungus to the genus Endothia, and suggest the 

 name E. parasitica for it. The related fungi are E. radicalis and 

 E. virginiana, a new species. — F. J. C. 



Chlorosis, Treatment for {Rev. Hort. d'Alg. p. 123; April 

 1912). — A solution of 2 per cent, iron sulphate watered on in dull 

 grey weather, or preferably after sunset, is recommended against 

 chlorosis. If the chlorosis be produced by accidental causes, the 

 sulphate-of-iron treatment will be found of great advantage, but in 

 those fairly frequent cases where the disease proceeds from the bad 

 quality of the soil or too much damp at the roots the cause must also 

 be removed or counteracted. — M. L. H. 



Cistus, Hybrids of. By Ed. Barnet {Beih. Bot. Cent. Bd. 29, 

 pp. 306-394; 15 figs.). — This is an important contribution to the 

 theory of heredity, and should certainly be studied by all interested 

 in practical hybridization. 



Seventeen species of Cistus and one Helianthemum were used in 



