DISEASES OF PLANTS. 825 



and Septoria pi.n), black mold of pea {Plcoapora pisi), damping off 

 (probably Pythium deharyanum), a bacterial disease, and a disease 

 attacking the seed, producing dark olive patches on the seed coat a few 

 days after planting. These diseases may occur singly or more com- 

 monly associated with some of the otliers. The nature of their attack 

 on the host is described, and the use of fungicides and selection of 

 sound seed recommended as prev^entive treatment. 



A fatal disease to truck cro2)s (pp. 302-3GG). — Specimens of diseased 

 tomato, eggplant, and other plants were sent the author from the Florida 

 Experiment Station, and the disease was recognized as similar to one 

 on lupines in Louisiana, in which a Penicillium developed abundantly 

 when placed in a moist chamber. Cultures made from the Florida 

 material developed sderotia abundantly in a short time. Cultures 

 were made on the stems of corn, squash, cucumber, and several weeds, 

 upon all of which the fungus grew vigorously. Open-air cultures were 

 not so successful, and on some idants the fungus was made to grow 

 only by exercising great care, and it is thought that while the disease 

 may be very destructive in Florida it will not prove serious in the lati- 

 tude of Xew Jersey. The study of this disease is still in progress. 



A field observation upon fruit decays (pp.366, 367). — In Bulletin 91 of 

 the station (E. S. R., 4, p. 657) the author reported on a decay of quinces 

 due to t^pluvropsis malorum and claimed that the source of contamina- 

 tion was an apple tree near by. A visit was made in July, 1893, to 

 the orchard, and while there was no decay manifest on the quinces 

 and pears, a grafted branch of the suspected apple tree was loaded 

 with fruit, a large per cent of which was decayed. The fruit on the 

 remaining branches of the tree was nnaffected. The obvious remedy 

 in this case was removing the graft of the early variety of fruit (Red 

 Astrachan). 



Decays of mature apples (pp. 367-377). — This is a reprint of a popular 

 article 1 in which are described specking of apples, apple scab, mold, 

 blotch, bitter rot, and black rot. 



Blight of ornamental spurge (pp. 377-379). — An anthracnose of euphor- 

 bias, due to Glceosporimn euphorhice^ is described. 



Fungus diseases of cultivated sedums (pp. 379-381). — Two diseases of 

 sedums are described, an anthracnose due to Septoria sedii, and a dis- 

 ease due to Vermicularia telephii. The affected portions should be 

 collected and burned to prevent the spreading of the diseases. 



Hollyhoclc diseases (pp. 381-383). — Descriptions are given of a holly- 

 hock rust {Pncciniamalvacearum), a leaf spot {Cercospora althceina), and 

 a leaf blight {Phyllosticta althceina). All sorts of hollyhocks are sub- 

 ject to these diseases. The author recommends that seed should be 

 saved oidy from plants free from disease, that all young plants known 

 to be affected should be rejected, and that old plants be sprayed with 

 Bordeaux mixture at least once a week during the growing season. 



1 Pop. Sci. Monthly, 1893, May. 



