Pflanzenkrankheiten. 333 



Cook, M. T. and G. W. Wilson. Cladosporium disease of 

 Ampelopsis tricuspidatum. (Phytopathology. IV. p. 189—190. 1914.) 



The disease, described in this paper attacks the vines of all ages 

 causing their death. Within a few days all the diseased parts were 

 dead and dry. Sections cut from these vines and put into moist 

 Chambers developed a growth of mycelium within 24 to 48 hours. 

 In these conditions the organism fruits abundantly. Inoculations 

 made into healthy vines, caused in about ten days the first efifects 

 of the disease and later cultures from them gave the same organism. 

 The organism penetrates the stems, sometimes causing a hyper- 

 trophy, but does not fruit in nature. The same organism was found 

 fruiting abundantly on mummied berries and last years peduncles 

 where it grows apparently as a saprophyte. 



It has been determined as Cladosporium herbanim Link. However 

 the conidiophores have very pronounced lateral enlargements on 

 which conidia are borne. These are larger than in any other form 

 of the species, which has come to the writers notice. The fungus 

 has been recorded b^^ Kellerman from Ohio, by Pierce collected 

 on grapes in California, and by von Thümen als occurring on 

 the grapes in Europe. A similar fungus on grapes in Australia 

 is recorded by Mc Alpine as C. uvarum. The disease, was comnon 

 in northern New Jersey and was the cause of a great deal of 

 complaint. " M. J. Sirks (Haarlem). 



Edson, H. A., Seedling diseases of sugar beets and their 

 relation to root-rot and crown-rot. (Journ. Agr. Res. IV. 

 p. 135-168. pl. 16—26. May 15, 1915.) 



Four fungi have been found to stand in a causal relation to 

 damping off of sugar beets in America: Phoma Betae, Rhisoctonia 

 sp., probably identical with Corticiim vagum Solan/, Fythhan Deba- 

 ryaiiiDU, and an undescribed member of the Saprolegniaceae. The 

 Phoma and Rhisoctonia, which do not necessarily kill the seedlings, 

 may cause characteristic decay in the mature beets, as does Rhiso- 

 pii's nigricans. Trelease. 



GFaves, A. H., Notes on diseases oftrees in thesouthern 

 Appalachians. IL (Phytopathology. IV. p. 5—10. 1914.) 



In this paper the various diseases and injuries are noted, to 

 which the Scrub Pine (Pinus virginiana Mill.) is prone. First the 

 species was found to be subject to the attack of a variety of insects, 

 which cause locally considerable damage. As regards fungous 

 diseases, it suffers most of all from a trouble which has been named 

 the „burl disease", caused by Cronartium Querciis (Brond.) Schrot., 

 originally known as Peridermium cerebri Peck, but afterwards as 

 aecidiumstage connected with the uredo- an teleuto-stages of C. 

 QiiercHs (Brond.) Schrot., found on a great many of Quere us-s^ecie?,. 

 In the pine, the mycelium remains in active condition in the 

 cambium region of the burl for manj^- years. An excessive amount 

 of soft, pulpy wood in the burl. which increases from year to year 

 results from the Stimulus, exerted b}^ the fungus. The Scrub Pine 

 is also occasionally affected with „heart rot" caused by Trametes 

 Pini (Brot.) Fr., and to a lesser degree by a rust, Gallowaya Pini 

 (Gall.) Arth, which attacks the needles, causing a „leaf cast". A 

 second disease of the needles, caused by Coleosporium inconspicuum 

 Long, has recently been found, but this is apparently rather rare. 



