350 CONNECTICUT EXPERIMENT STATION REPORT, IQI2. 



found rather conspicuously in the fall on the variegated variety 

 of the Japanese hop, cultivated for ornament in the writer's 

 yard, and caused premature death of the foliage. While this 

 mildew has been responsible for considerable damage in the hop 

 districts of Europe in times past, it has only recently been com- 

 plained of in the hop districts of New York State. Blodgett 

 reports that dusting the plants with sulphur is a rather satis- 

 factory method of controlling the trouble there. 







JUKIPEB, CHINESE, Juniperus chinensis. 



RUST, Gymno sporangium japonicum Syd. Plate XVIII d. 

 The last of March, 1911, Mr. Walden, while inspecting importa- 

 tions from Japan at the Elm City Nursery, found on the above 

 host, specially on the form known as compacta, an unusual rust 

 on both stems and leaves. On a seedling of this same species, 

 called /. virginalis, this same rust was also found, but only on 

 the leaves. Altogether, 55 plants were found that had the out- 

 breaks on the stems, and these were all destroyed. Those show- 

 ing the rust only on the leaves were ordered planted in an 

 isolated place, and an examination of them the next spring 

 revealed no signs of the fungus. A few days after Mr. Walden 

 found these infected specimens, he discovered others in an 

 importation, also from Japan, of the Stephen Hoyt's Sons 

 Nursery Company. In this case 49 plants showing the rust on 

 the stems were destroyed. The writer determined both these col- 

 lections to be the telial, or III, stage of Gymnosporangium 

 japonicum Syd., which until this time had not been reported 

 in America. 



An examination of Plate XVIII c-d shows that this rust is 

 quite different from our common red cedar rust, though appar- 

 ently it is not so different from some of the other species 

 reported from this country, especially G. effusum. This fungus 

 has been well described by Shirai in Zeitschr. fur Pflanzenk. 

 10, pp. 1-5, and he determined that the I stage is Rcestelia 

 korecensis, which is more or less injurious to the foliage of pears ; 

 and can also infect apples and quinces, in Japan. 



The gelatinous swellings of the fungus evidently developed 

 on the infected trees in transit, though they appear in Japan 

 a little earlier than in this country. These are the fruiting 

 bodies, or sori, and are 3-5 mm. high, more or less flattened 



