142 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Aphlds Injurious to Orohard and Bush Fruits. By A. L. Quaintance and 

 A. C. Baker (U.S.A. Dep. Agr. Bur. Entom., Farm. Bull. 804, April 1917; 

 30 figs.). — Contact sprays such as kerosene emulsion, soap washes, nicotine 

 solutions, etc., must be used to kill aphids. Directions for applying and pre- 

 paring them are given in this bulletin. — V. G.J. 



Aphis, Red Currant, Myzus rlbis. By M. D. Haviland (Proc. Roy. Soc. 

 Edin. 39, pp. 78-112; with 9 rigs.). — This paper deals with the life history 

 and bionomics of this well known Aphis, whose life cycle had never been 

 determined. The stem-mother Aphis hatches in April, passes a three weeks' 

 larval period, producing red blisters on the leaves. (These are not caused by 

 the young Aphides, produced in early May, as was thought by many.) 



It is migratory to Labiata? and other weeds during the summer, but the 

 migration is not essential, as the whole life cycle may be passed on Currant. 

 After migration it has been described as a different species, Phorodon galeopsidis. 

 M. whitei, recorded from England, and M. dispar, recorded from America, 

 may both be proved to be identical with M. ribis: 



Winged forms were less productive and shorter-lived than wingless. 



It has both predaceous and parasitic enemies, particularly a small parasitic 

 Braconid, Aphidius ribis. 



The bushes should be sprayed with nicotine solution or paraffin emulsion 

 in April as soon as the buds open, and again in early May. Where small 

 numbers are present, pick off blistered leaves. — G. F. W. 



Asparagus falcatus Linn. By C. H. Wright (Bot. Mag. t. 8751 ; 1918). — 

 Native of Ceylon ; Tropical and Extratropical South Africa. A species which 

 has long been in cultivation as a greenhouse climber, and is sometimes confused 

 with A . Sprengeri. The flowers are borne in racemes and are white in colour 

 and sweet scented. This species thrives best in a poor gravelly soil and can 

 be propagated, either by seeds or cuttings taken from the smaller branches. 



L. C. E. 



Beans susceptible to Mosaic, Additional Varieties of. By D. Reddick and 

 V. B. Stewart (Phytopathology, ix. pp. 149-152, March 1919). — The authors 

 give a long list of varieties of bean which they found to be susceptible to 

 mosaic disease in addition to those already reported. ' Robust' has proved 

 immune, and this is so far the only one proved to be so. — F. J. C. 



Beans, Varietal Susceptibility to Strains of Collet otrichum Lindemuthianum. 



By M. F. Barrus (Phytopathology, viii. pp. 598-614, Dec. 1918 ; plates). 

 — More than one strain of the fungus, Colletotrichum Lindemuthianum, exists, 

 and while some varieties of bean (Phaseolus vulgaris) are resistant to one, 

 they are liable to attack by another strain. The source of immunity is thus 

 probably different from that of immunity of other species of plant either 

 nearly or distantly related to the bean. Black-eyed varieties appear to be 

 markedly susceptible. Lists of inoculations and their results are given. — 



F. J. C. 



Bee Poisoning, Blossom Spraying and. By Jas. Troop (Jour. Econ. Entom. 

 vol. xi. October 1918, p. 433). — A brief account of experiments in hand to ascertain 

 the effect of arsenicals as a blossom spray is given. The programme is designed 

 to cover both field and laboratory requirements, and it is proposed to publish in 

 detail the results obtained after another year's work. So far as the laboratory 

 work goes it has been found that less than 0000005 gramme of arsenic (As 2 0 3 ) 

 proves fatal to a bee. This result appears to indicate that bees may be killed 

 by an arsenical poison spray at blossom time. — G. IV. G. 



Berberls Beanlana Schneider. By W. J. Bean (Bot. Mag. t. 8781 ; 1918). — 

 Native of Szechuan. A hardy Barberry, 8 to 10 feet high. The leaves are 

 deciduous, dark green above, rather glaucous beneath. The flowers are rich 

 yellow, I inch across, produced in June in corymbose panicles from the axils of 

 the leaves. The fruits are bright purple, f in. long. — L. C. E. 



Bulbophyllum Hamelinli Rolfe (Bot. Mag. t. 8785; 1918).— Native of 

 Madagascar. A plant which thrives well in the tropical house. It can easily 

 be distinguished from other members of the genus by the pseudo-bulbs which 

 are concave on one side and convex on the other. The flowers, medium-sized, 

 suffused and blotched with purple and with a dark purple lip, are borne in a 

 drooping raceme, 4 to 5 inches long.— A. C. E. 



