DISEASES OF PLANTS. 61 



In 1SU8, while preliminary studies in apple canker were being con- 

 ducted, a body blight of pear trees was discovered in which a Spha3- 

 ropsis w^as found abundant, commonly associated with Macrophoma 

 malorum. 



Notes are given on a Pacific-coast apple-tree anthracnose, which is 

 described elsewhere (E. S. R., 12, p. 58), and a European canker due 

 to species of Nectria. 



Plant diseases, A. L. Quaintance {Georgia Sta. Rpt. 1899, pp. 139-141). -^Br'iei 

 notes are given on the occnrrence of a number of diseases, with suggestions for their 

 prevention. Among those enumerated are the Macrosporium disease of tomato plants 

 and eggplants, Sclerotium disease of Irish potatoes and tomatoes, a rot of tomatoes, 

 the black rot of grapes, the brown rot of grapes, celery blight, and soft rot of sweet 

 potatoes. 



Divers diseases discussed, F. H. Hall {New York Slate Sta. Bui. 164, popular ed., 

 pp. 5) — A popular edition of Bulletin 164 of this station, in which a number of plant 

 diseases are discusseil (see p. 55). 



Report of the botanist, C. E. Bessey {Rpt. Nebraska Slate Bd. Agr. 1898, pp. 

 139-161). — A preliminary account of the diseases of the farm crops of Nebraska. 



The diseases of the potato, E. Gain {Sta.Agron. Nancy Bui. 1, 1899, pp. 40-51). — 

 The author divides the diseases of the j^otato into 2 categories based upon their 

 importance. In the first are placed the dry rot, wet rot, Phytophthora, and a spot 

 disease called frizolee. In the second class are considered potato scab, Rhizoctonia, 

 a disease due to Spongospora solani, and the greening of the tubers. The causes of 

 these various diseases are described, together with their effects upon the host plants, 

 and suggestions are given wherever known for the prevention of the diseases. 



Smut in wheat {Agr. Jour. Cape Good Hope, 16 {1900), No. 3, pp. 147-152). 



Gumming disease in cane {Internal. Sugar Jour., 3 {1900), No. 14, p>p. 97, 98). 



Asparagus rust, P. H. Rolfs {South Carolina Sta. Rpt. 1899, p. 17). — Asparagus 

 seed from a field of rusted asparagus carried many spores, although the berries did 

 not appear to be diseased. " Though direct evidence is wanting, it seems altogether 

 probable that seedlings raised from such seeds would contract the disease." Uredo 

 spores were found on stocks of two-year-old plants in a diseased field two or three 

 inches below the surface of the ground. In such cases burning over the beds, which 

 has sometimes been recommended, would not eradicate the disease. It is not consid- 

 ered advisable to plant seed gathered from a rusted field, nor to set out a plantation 

 with plants from such a source. 



Fruit tree enemies, E. H. Potter {Gard. Citron., 3. ser., 27 {1900), No. 681, p. 

 20). — Notes are given on canker, mildew, gumming, and luimerous insect enemies, 

 with suggestions for their suppression. 



Canker — an enemy of the apple, F. H. Hall and AV. Paddock {Neiv York 

 Stale Sta. Bid. 163, popular ed., pp. 6, pjh. 2). — A popular edition of Bulletin 163 of 

 the station (see p. 59). 



Diseases of the olive, L. Navarro {Bol. Agr. 3£in. e Ind. [ilft'.deo], 9 {1899), No. 

 2, pp. 3-115, ph. 12) . — This article is in the nature of a general treatise on olive 

 diseases. The diseases of the olive are considered under the following five heads: 

 Influences of the soil, influences of the atmosphere, diseases caused by vegetable 

 parasites, injuries caused by insects, and diseases produced by faulty systems of 

 cultivation. 



Fumagine and its treatment, L. Degrully {Prog. Agr. et Vit. {Ed. L'Est), 21 

 {1900), No. 6, pj). 165, 168). — Notes are given on fumagine, or sooty mold, occurring 

 on the foliage of the grapes. As the fungus follows attacks tjf plant lice, the use of 



