724 



JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



American Blight or Apple Plant-louse on Roots of Apple- 

 trees. By C. Ritter (Zeit. f. Pflanz. xii. 1902, pp. 7-10; pi. 1).— The 

 life-history of Schizoncura lanigera, Hausm., is known. The author, 

 however, directs attention to obscure points. In spite of many remedies 

 the damage goes on. The occurrence of the blight on the roots causes 

 swellings, which are shown on pi. 1, and it is suggested that the source 

 of fresh infection of aerial parts may be the young insects developed on 

 the roots. The paper is suggestive, but contains few original observa- 

 tions. — W. G. S. 



Amphoranthus spinosus. By S. Le M. Moore (Journ. Bot. 477, 

 p. 305 ; tab. 441 ; 9/1902). — Description and figure of a new monotypic 

 genus of the sub-order Ccesalpiniea from Damaraland, collected by T. G. 

 Een, and now in the British Museum Herbarium. It is a leafless 

 spinous shrub or undershrub, with sub-sessile fascicled axillary 

 apetalous flowers. — 67. S. B. 



Anemone cernua. By Sir J. D. Hooker (Bot. Mag. tab. 7,858). — 

 Nat. ord. Banunculacea, tribe Anemoncce. Native of Manchuria and 

 Japan. A tall flowering species, remarkable for the inner surface of the 

 sepals being red-brown, the anthers yellow, and the styles blue. The 

 flower is nearly two inches across. It flowered at Kew in 1902. — G. II. 



Anthospermum Randii. By Spencer Le M. Moore (Journ. Bot. 

 475, p. 253 ; 7/1902). — Description of a new species collected by Dr. Rand 

 at Salisbury, Rhodesia, from specimens in the National Herbarium. 



G. S. B. 



Apple, Black Spot, and Spraying for Fungus Diseases. By 



i). McAlpine (Bull. Dep. Agr. Melb. No. 3; 1902; with 11 plates).— 

 After an introduction combating the theory that plant diseases are 

 "blights" caused by the weather, it proceeds to record the earliest 

 appearance of this disease, caused by Fusicladium dendriticum in Europe 

 and Australia,. This is succeeded by an enumeration of the varieties of 

 Apple and Pear most and least affected by the disease. Then follows 

 the symptoms and effects of the disease, with an estimate of losses caused 

 by it. This is said to be £10 per acre, on an average, for all kinds liable 

 or not liable to attack. Hence the total annual loss for Victoria in 

 Apples alone is estimated at £40,000. 



Afterwards follows a statement of the conditions favouring the 

 disease, the nature of the fungus, and its life history ; and it is suggested 

 that the winter condition of the fungus is passed on fallen leaves under a 

 new phase, that of Vcnturia iiuequalis and Venturia pyrina, both of 

 which have been found in Victoria. But the evidence connecting the 

 sporidia of these splueriaceous fungi with the spring infection is not 

 forthcoming, and the conclusion arrived at is that the summer spores of 

 the mould are able to survive the winter, and start to germinate afresh on 

 the return of spring. The residue of the " Bulletin " is occupied with 

 details of the experiments which have been made in treating the disease. 



It is shown by tables that one formula for composing Bordeaux mixture 

 has been more successful than any other, and is termed "Grant's mix- 



