326 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
have been found he has thought it wise to publish them at once. Notes 
are given on species already known. Most of the new species belong to 
Puccinia, a few belong to Goleosporium. A. L. S. 
Susceptibility of Wheat to Bunt. — 0. von Kirchner ( Zeitschr . 
Pflanzenkr., 1916, 26, 17-25). The author has made a series of tests 
on wheat seedlings, and he comes to the conclusion that immunity rests 
on the different chemical content of the plant cells. He cites the results 
on two varieties of wheat extremely like each other, but varying as 
regards their liability to become diseased. He found that the acid 
content was perceptibly higher in the more immune of the two. 
A. L. S. 
Susceptibility of Phaseolus vulgaris and P. multiflorus to 
Rust and other Diseases. — Georg Lakon (Zeitschr. Pflanzenkr ., 1916, 
26, 83-97). These two species of Phaseolus are the ones most com- 
monly cultivated for beans. Of P. vulgaris there are innumerable 
varieties, while there are few for P. multiflorus. There is also a 
remarkable difference in susceptibility between the two species. The 
writer has gathered from his own experiments and from literature that 
P. multiflorus is almost immune not only to rust, but also to other 
parasitic fungi such as Gloeosporium Linde muthianum, Uromyces appen- 
diculatus , etc. A. L. S. 
Studies of Corn Rust.— George F. Weber ( Phytopathology , 1922, 
12, 89-97, 8 figs.). The writer experimented with Puccinia Sorghi , 
infecting seedlings with the urediniospores. He tested the various 
temperatures, and found that the optimum for infection was about 18° 0. 
The germ tubes of the spores entered the plants by the stomata, with or 
without appressoria. The spores did not overwinter in Wisconsin 
(1919-1920). A. L. S. 
Experiments in the Infection of Pinus Strobus with Cronar- 
tium Ribicola. — Harlan H. York and Walter H. Snell ( Phyto- 
pathology , 1922, 12, 148-50). The writers inoculated about 500 potted 
seedlings of Pinus Strobus with teleutospores from freshly picked leaves 
of Ribes nigrum. The methods of inoculation are described. The 
experiments were begun about August 1921. The plants were exam- 
ined in November of the same year, and already many inoculations had 
been successful : typical yellow spots were formed on the needles. 
They reckon that sporidia are developed in five to six hours after the 
dry teleutospores have been brought into favourable conditions for 
germination, and that infection may occur within 12J hours after the 
sporidia reach the needles of Pinus Strobus. A. L. S. 
Incidence of Loose-Smut in Wheat Varieties — F. D. Fromme 
(Phytopathology, 1921, 11, 507-10). The writer noted that a certain 
variety of wheat was free from loose-smut, Ustilago Tritici. He has 
been testing various varieties, and he finds that three bearded varieties 
took infection very much in excess of three beardless varieties. Control 
of the disease may thus be secured by selection or by breeding of 
immune varieties. A. L. S. 
