654 EXPERIMENT STATION EECOBD. [VoL 36 



with Poly poms admirabilis during August. Apple trees in the eastern United 

 States are said to be more commonly attacked by another type of Polyporus. 

 P. galactinus or P. spumeus malicola is the species ordinarily found in old 

 orchards of the New England States, while P. fhsUis is reported as attacking 

 trees in Virginia. 



Monilia on fruit trees, G. Voss (Flugbl. Samml. Pflansenschutz, K. Landw. 

 Akad. Bonn-Poppelsdorf, No. 7 {1915), pp. 4, fids. 5; abs. in Bot. Centbl., 129 

 (1915), No. 22, pp. 574, 575). — A description is given of symptoms and results 

 of attack on fruit trees by the Monilia forms of Sclerotinia cinerea, S. fructigena, 

 and S. laxa. Protective measures include the early removal and destruction of 

 all affected parts, including fallen fruits and dead wood. 



Apricot fruit spots, J. T. Baerett (Univ. Cal. Jour. Agr., 3 {1916), No. 8, pp. 

 S46-349, figs. 3). — Descriptions are given of brown rot of apricot, caused by 

 PuGcinia pruni-spinosw ; of Coryneum fruit spot, due to C. beijerinckii; and 

 of scab or black spot of apricot, caused by Cladosporium carpophiium. It is 

 said to be easy to confuse some of these, especially in their early stages. 



The reciprocal influence between mycotrophic roots of different plants, 

 L. Petei {Atti R. Accad. Lincei, Rend. CI. Sci. Fis., Mat. e Nat., 5. ser., 24 

 {1915), II, No. 11, pp. 536-539, fig. 1). — Describing the results of growing oaks 

 and olives in close proximity, the author holds that the injury often observed 

 to be suffered by the olive in this relation may be due to the impoverishment 

 of the soil by the oak or to an eventual root rot caused by a Dematophora 

 developing on the subterranean residues of the oak growths, and not to the 

 proximity of the mycorrhiza on the oak. The possible bearing in this connec- 

 tion of facts previously observed (E. S. R., 26, p. 849) is discussed. 



Formalin as a spray against American gooseberry mildew {Deut. Landw. 

 Presse, 4^ {1915), No. 36, p. 329 ; abs. in Internat. Inst. Agr. [jKome], Mo. Bui. 

 Agr. Intel, and Plant Diseases, 6 {1915), No. 7, p. 999).— B. Panten of Kaz- 

 mierz, Posen, reports that a 1 per cent solution of 40 per cent formalin, thor- 

 oughly applied in the early spring and again before the period of blooming, 

 effectively controlled American gooseberry mildew. 



A new fungicide for use against American gooseberry mildew, J. V. Eybe 

 and E. S. Salmon {Jour. Bd. Agr. [London], 22 {1916), No. 11, pp. 1118-1125; 

 abs. in Gard. Chron., 3. ser., 59 {1916), No. 1523, p. 132).— It is stated that an 

 ammonium sulphid solution containing 0.18 per cent of sulphur can be recom- 

 mended for commercial use on an experimental scale for the purpose of pro- 

 tecting the fruit of gooseberries against the mildew. Lime-sulphur wash should 

 be employed for early sprayings until such time as its use would affect the 

 marketing of the berries, when the ammonium sulphid solution should be sub- 

 stituted. It is stated that solutions of liver of sulphur at the strength usually 

 considered as fungicidal are inefficient against the disease, while concentra- 

 tions which are fungicidal cause such severe scorching of the gooseberry 

 bushes as to preclude their use in this connection. 



Notes on the dying' of citrus trees, A. H. Benson {Queensland Agr. Jour., 

 n. ser., 5 {1916), No. 5, pp. 258-266). — Concerning the dying of citrus trees in 

 different sections, a progress report made by F. Smith is quoted at some length 

 with comments thereon. The trouble is considered due to causes other than 

 soil conditions, and as more probably parasitic in character, though possibly 

 very complex in origin. Age and living conditions of the trees are discussed in 

 this connection. It is thought possible that irregularity in growth may prove 

 to be very important. 



Descriptions are given also of other twig, collar, and root troubles. 



