DISEASES OF PLANTS. 1091 



of admission to the mistletoe are through the lenticels or places where the parasite 

 penetrates through cellulose cell walls. This conclusion is based on anatomical 

 evidence alone, and is to be the Bubjecl of further experimental investigation. 



Annual report of the Danish seed control station, 1903-4, K. Dobph- 

 Petebsen [Aarsber. Dansk Frokonirol, 33 1903 (■), pp. ■'■■'■ .—A report is given of the 

 activity of the seed control station of Denmark for the year ended June 30, 1904, in 

 which the usual data relating to purity, germination, etc., of seeds are given. 



The twenty-seventh annual report of the Swiss seed control station at 

 Zurich, F. <;. Stebleb et ax. I Landw. Jahrb. Schweiz, 18 I 1904), No. l. y , pp. 589- 

 643,fig8. 3). — A detailed report is given of the activity of the federal seed control 

 station at Zurich for the year ended June 30, 1904. During this time 10,166 samples 

 of seed were tested, and the details of the tests are given. Investigations are reported 

 briefly on studies of a number of different kinds of seed, particularly those of 

 leguminous fodder plants, grass mixtures, etc. 



Weed pests | Agr. Bui. Straits and Federated Malay States, 3 I 1904 . No. l :, pp. $90- 

 49S). — Notes are given on a number of weeds that are more or less troublesome 

 throughout the Tropics, and attention is called to the fact that many of these species, 

 which seem to grow with great rapidity and threaten to become a general nuisance 

 after becoming extremely abundant, die away almost as rapidly, and later frequently 

 become very scarce. This is said to be true of Ian tana and a number of other tropical 



Specie.-. 



Some injurious weeds, J. Bubtt-Davy i Transvaal Agr. Jon,-., 3 I 1905 , No. 10, 

 pp. 291-299, pis. 5). — Descriptions are given of a number of species of injurious 

 weeds, their distribution throughout southern Africa and elsewhere is indicated, and, 

 so far as known, methods of eradication are 'described. Many of the species enum- 

 erated are common to this country, and the suggestions for eradication are in a 

 number of cases based upon investigations carried on at the experiment stations and 

 elsewhere. 



On the eradication of weeds by spraying with iron sulphate solution, 

 E. Haglund and II. vox Feilitzen {Svensk Mosshdt. Tidskr., 18 (1904), No. 6, pp. 413- 

 420). — Preliminary experiments on moor soils showed that the spraying method fur- 

 nishes an effective means of checking, if not killing, many of the weeds growing on 



Hllcll SOilS. — F. W. WOLL. 



DISEASES OF PLANTS. 



Department of botany, L. F. Henderson' (Idaho Sta. Rpt. 1904, pp. 27-32). — 

 A study was made during the season of the apple-twig blight and of the yellows or 

 blight of tomatoes. Some fertilizer experiments to control the latter are recorded 

 in some detail. 



Tomato yellows, as the author prefers to call this disease, "makes itself known by 

 a gradual yellowing of the whole plant, leaves and fruit as well as stem, and a refusal 

 of the plant to produce more than half-grown fruit, which never ripens, though the 

 plant retains its succulent nature till late into the season." This disease is the cause 

 of nearly all of the tomato failures found in the State, especially in the Lewiston 

 district in southern Idaho. 



Experiments by the author indicate that " plants set in new land in southern Idaho 

 will be largely overcome with blight. Those set in well-drained, well-watered, and 

 manured soil will not blight so badly." It was found that where the root system 

 was not disturbed plants were more resistant to the disease than otherwise. All 

 varieties appeared to be equally susceptible to the disease. 



Diseases of plants cultivated in the Tropics, G. Delacroix (Agr. Prat. Pays 

 Chauds, 5 (1905), No. 23, pp. 154-107, figs. 3). — In continuation of the previous paper 

 (E. S. R., 16, p. 676) the author concludes his observations relating to the healing of 



