270 EXPERIMENT STATION RECORD. 



The mixture of species in u woodlot is encouraged by the author on account of the 

 easier management and greater variety of forest products. Different portions of 



the \\ Uo1 are illustrated in the photographic reproductions and suggestions given 



for the improvement of the different tracts by thinning, pruning, planting, etc. 



Forest belts and notes on the arboretum, YV. T. Macoon ( ( 'anada Expt. /■arm* 

 Rpts. 1903, pp. 121-125). — A brief report is given on the present condition of the 

 trees in the forest belts which are, on the whole, said to be quite satisfactory. A list 

 is given of some of the more important trees, shrubs, and herbaceous perennials grow- 

 ing in the arboretum, and descriptions given of a number which are attractive on 

 account of their foliage, bark, or fruit. 



Trees and shrubs, A. jMackav (Canada Expt. Farms Rpis. 1903, />/>. 384-389). — 

 A list is given of trees and shrubs which have proved hardy and satisfactory in 

 growth at the Indian Head Farm and which are recommended for cultivation 

 throughout the territories. A list is also given of the species and varieties now under 

 observation, together with the date of planting and notes on relative hardiness. 



Exhibit of tree planting on a model prairie farm at the Louisiana Pur- 

 chase Exposition, G. Pinchot (U. S. Dept. Ayr., Bureau of Forestry ('in: 29, pp. 8, 

 fig. 1). — The author describes the open-air exhibit of the Bureau of Forestry, 

 which is designed to illustrate the use of forest trees for windbreaks, hedges, and 

 woodlots in the prairie States. The relative location and extent of woodlots, hedges, 

 and windbreaks have been planned with reference to the actual needs and conditions. 

 Different systems of planting and different species of trees are suggested for mixtures 

 suitable for the different parts of the country. . 



Practical assistance to users of forest products, <i. Pinchot ( U. S. Dept. Agr., 

 Bureau of Forestry Circ. 28, pp. 2). — A statement is given of the conditions under 

 which the Bureau of Forestry offers its assistance in the study of problems relating 

 to the selection, testing, handling, seasoning, and preservative treatment of con- 

 struction and other timbers, and the form of agreement upon which these coopera- 

 tive investigations are carried on is also given. 



DISEASES OF PLANTS. 



A soft rot of the calla lily, C. O. Townsend ( U. S. Dept. Ayr., Bureau of Plant 

 Industry Bui. 60, pp. 47, ph. 9,fiys. 7).- — An account is given of a serious disease of 

 the calla lily which has been under the author's observation since 1899. This dis- 

 ease has made its appearance in various parts of the United States where callas are 

 cultivated and has caused great loss to the growers. 



A number of greenhouses where the disease was reported were visited by the 

 writer, who found the callas rotting usually at or just below the surface of the ground. 

 The disease sometimes extends down into the conn, sometimes upward into the 

 leaves, and frequently in both directions. Occasionally it seems to start in the edge 

 of the leafstalk, in the flower stalk, or in the underground part of the corm, but 

 usually it appears at the end of the corm at or near the surface of. the ground. 



When a diseased corm is cut open the healthy part is found nearly wmite, while 

 the diseased part has a brownish color and is soft and watery. When the leaves are 

 involved the petioles become slimy without immediately losing their green color and 

 as the disease progresses it extends toward the center of the petiole interfering with 

 the transfer of material between the corm and the leaf, the edges of the leaf becom- 

 ing pale and later brown. Pale spots becoming brown appear in the leaf blade and 

 finally the whole leaf becomes brown and dead. Sometimes the disease develops so 

 rapidly that the leaf rots off at the base and falls over without losing its green color. 

 When the disease has progressed far enough to attack the flower stalk, the flower 

 turns brown and the stalk without losing its color eventually falls over. 



If the conditions for the development of the disease are unfavorable after the conns 



