104 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
Susceptibility in the plant is increased by an excess of nitrogen, but it can be 
largely counteracted, by an increase of potash. Susceptibility varies with the 
variety of tomato. A suggestion is made that the Grand Rapids Tomato Disease 
may be identical with this stripe disease. Control methods suggested are steril- 
ization of soil by heat, of seed by formalin, and selection of resistant varieties. 
The cutting away of a diseased stem and allowing a lateral to develop often 
gives a clean plant. Infected prunings should be burned and the pruning-knife 
sterilized. Artificials should be used with care. — R. C. S. R. 
Tomatos under Glass. By H. H. Zimmerley (Virginia Truck Exp. Stn., 
Bull. 26; 23 pp., 2 figs.). — The tomato is grown in solid beds (in preference, of 
raised benches) composed of well-drained friable soil mixed with one-fifth well- 
rotted manure. After the fruit has set, fresh horse-dung is used as a mulch. 
The plants are grown on single stems in rows 30-36 inches apart. Thorough water- 
ing when necessary is preferable to frequent sprinklings. Attention must be 
paid to ventilation so that the air of the house may be dry. The success of 
the undertaking largely depends on the control of insect and fungus pests. 
Annual steam sterilization destroys nematode worms and checks Fusarium 
wilt. Fumigation with hydrocyanic acid destroys white fly (Aleyrodes vapor - 
ariorum). Plants showing signs of mosaic must be discarded. Lime is a partial 
remedy for blossom end-rot due to irregular watering and to excessive use of 
certain commercial fertilizers. — 5. E. W. 
Trimming Camphor Trees, A Machine for. By G. A. Russell (U.S.A. Dep. 
Agr., Circ. 78, Feb. 1920 ; 4 figs.). — Contains a description of the machine 
and the operation of trimming the trees. — V. G. J. 
Tropical Fruits. By a Committee (Am. Pom. Soc, 1917, pp. 196-214). — 
An annotated list drawn up with the object of working toward a greater degree 
of uniformity in the naming of tropical fruits. It shows the common names by 
which they have been mentioned or described by various writers, accompanied 
by their botanical, and suggested common, names. — A. P. 
Tulips, Darwin. By S. Mottet (Rev. Hort. vol. xcii., pp. 10, 11 ; 1 coloured 
plate). — Under certain conditions of soil and climate, the pure self colours of 
the Darwin Tulips exhibit variegation. In the coloured plate the flower supposed 
to represent ' Goldflake ' is incorrectly named. — S. E. W. 
Tussock Moth. By H. L. Webster (Iowa State Hort. Soc. Trans., 1918, 
pp. 408-410). — The ravages of the white-marked tussock moth have been held 
in check by encouraging children to collect the cocoons and eggs of the moth, 
by grease banding, and by spraying the trees with lead arsenate (1 lb. to 10 
gallons of water). — 5. E. W. 
Vegetables, Two Exotic (Dasheen and Chayote). By H. W. Youngken (Amer. 
Jour. Bot. vol. vi. No. 9, Nov. 1919, pp. 380-386 ; 3 figs.). — Within recent years 
two exotic vegetables, the dasheen and the chayote, have been introduced into 
the Southern States of America. 
The dasheen is a native of Trinidad, West Indies, and is a variety of Colocasia 
esculenta (L.) Schott of the natural order Araceae. It has a large central corm 
of 2 to 4 lb. , and has numerous ring-like scars of foliage leaves. These leaves 
are ear-shaped and of 3 feet in length. The corms are alone used as food 
and are prepared in a similar manner to the potato. The taste is not unlike 
a mealy potato. An excellent flour may be obtained by grinding the dried 
corms. 
The chayote (Chayota edulis Jacq.) is found in tropical America. It is a 
vine with perennial tuberous roots, leaf tendrils, and green or cream-coloured 
flowers. The fruit is a pear-shaped gourd and is about 8 oz. The fruits are 
collected when half ripe and are used in a similar way to the squash. The 
leaves and roots are eaten as fodder by cattle, while the stem gives a fine 
fibre.— A . B. 
Venidium macrocephalum DC. By J. Hutchinson (Bot. Mag. t. 8845 ; 
June 1920). — This Composite, nearly allied to A r dot is, is an annual from between 
Kano and the Orange River. It has large yellow-rayed flower heads with a red 
ring around the greenish disc florets, and grows to about a foot in height. — F. J. C. 
Verbascum Blattaria var. grandiflora Turrill (Bot. Mag. t. 8863 ; December 
1920). — An extremely luxuriant form of V. Blattaria, with large white flowers 
instead of typically yellow ones. — F. J. C. 
