3S8 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Chlorosis or " Calico " of Tomato is the same as the " Calico " of Tobacco, 

 and can be easily transferred from one host to the other. Further, other species 

 of Nicotiana are susceptible to the disease. Pure " Calico " juice {i.e. the juice 

 expressed from " calicoed " leaves) is much more potent than when diluted 

 with water. A small quantity is capable of infecting a healthy plant. The 

 '* virus " appears to renew itself in the tissues of the living plant ; and appears 

 to be of the nature of an enzyme, which is destroyed by heating, may be filtered 

 through a Berkefeld filter and readily extracted by ether, chloroform, or alcohol 

 without losing its infectious character. The " virus " may be preserved for 

 a long time by the addition of a small amount of toluol. Experiments with the 

 auto-digestive enzyme of Coprinus sp. as to the possibility of cure or prevention 

 of " calico " in tobacco gave negative results. Apparently it has no inhibitive 

 or curative action upon the infectious enzyme of " calicoed " tobacco. 



A fairlv complete list of literature on this subject is appended to the report. 



A. B. 



Tobacco Hornworms, Arsenate of Lead as an Insecticide against, in the Dark 

 Tobacco District. By A. C. Morgan and D. C. Parman (U.S.A. Dep. Agr., Farm. 

 Bull. 595, June 1914). — Arsenate of lead (cliplumbic), applied in powder form asa 

 remedy against hornworms, proved superior to Paris green, giving an increased 

 mortality and no burning of foliage. On the other hand, although cheaper 

 in first cost, Paris green always damaged the plants by burning the leaves, the 

 losses from this cause alone ranging from 4 to 20 per cent. 



Arsenate of lead, even in the face of heavy rains, will remain operative for 

 some days, while Paris green would need to be again sprayed on the plants. 



Dose suggested, 3^ to 5 lb. to the acre. — C. P. C. 



Tomato, Heredity of Types of Inflorescence and Fruits in. By M. B. Crane 



[Jour. Gen. v. July 1915, pp. 1-10 ; plates). — Two types of inflorescence 

 are recognized : the compound, as seen in ' Wonder of Italy ' and ' Buck's 

 Tresco,' with a large, much-branched inflorescence, bearing flowers and fruits 

 in all stages of development, the inflorescences usually occurring at intervals 

 of six nodes ; and the simple form, in which only about nine flowers occur, 

 and only three nodes intervene between the inflorescences. In F x all the plants 

 of these two forms crossed had simple inflorescences, while the usual 3 : 1 

 segregation occurred in F z , the compound type coming true in F 3 . 



Correlation was found" between the shape of the fruit and the number of 

 loculi, the long fruits (" long " is recessive) being usually bilocular, the round 

 plurilocular. Many Mendelian characters are apparently involved in the fruit 

 shape, the elucidation of which requires further work. 



In some forms sterility of anthers occurred, but usually the plants are self- 

 fertile, and, from the relative positions of anthers and stigmas, not readily crossed. 

 Parthenocarpic fruits (usually entirely without seeds) occurred in forms with 

 contabescent anthers devoid of pollen. — F. J. C. 



Tomatos, Fertilization Experiments with. By Arthur L. Dacy [U.S.A. Exp. 

 Stn., W. Virginia, Bull. 142, Nov. 1913). — The author suggests the addition of a 

 complete fertilizer containing 



75 lb. nitrate soda 75 lb. nitrate soda. 



200 lb. acid phosphate or 150 lb. steamed bone. 



80 lb. muriate potash 80 lb. muriate potash 



as giving the best results on outdoor tomatos when added at the rate of 400 lb. 

 to the acre. Judging from British standards, however, the yields at the best 

 seem very low, averaging only about 150 bushels to the acre. — C. P. C. 



Tomatos, Strain Tests for. By C. E. Myers (U.S.A. Exp. Stn., Pennsyl- 

 vania, Bull. 129, March 1914 ; 12 pp.). — This'bulletin gives the results of three 

 years' experiments instituted for the purpose of determining the relative values 

 of strains of tomato seed when secured from different sources. There were varia- 

 tions in yield amounting to as much as thirteen tons an acre, differences which 

 are attributed not to environmental conditions, but to the heredity. It is 

 suggested that seed should be secured a year in advance of the time when it 

 will be needed for general planting and submitted to a preliminary test, as in this 

 way, by securing several strains, it could be learned which would be the most 

 desirable for use the following year. — A . P. 



Transplanting Vegetable Seedlings (Queensland Agr. Jour. Oct. 1914, p. 280). 

 — The soil to be planted should be fine, not hard and lumpy. When taking 



