No. 2, June, 1921] PATHOLOGY 201 



perature for growth of the fungus being around 29°C. When the temperature remains much 

 below this, the disease does not develop strongly. This is shown by weekly tests made 

 throughout the year. Daring the winter months, the infection percentage was very low. — 

 Attempts to obtain wilt-resistant strains have given good results. No variety is immune, 

 but the wilt develops much more slowly in some than in other's; this slower development 

 enables the more resistant strains to make a satisfactory crop of fruit. Many of the com- 

 mercial varieties, including the widely grown Stone variety, are extremely susceptible to the 

 disease. Results of variety tests are given. The recommendations for control include rota- 

 tion, seed bed sanitation, and the use of resistant and early varieties. — C. W. Edgerton. 



1389. Elliott, John A. Arkansas cotton diseases. Arkansas Agric. Exp. Sta. Bull. 

 173. ^6 p., 5 pi. 1921. — This is a popular account of Arkansas cotton diseases, with notes 

 on occurrence. "Phoma blight" is described as a new disease. — John A. Elliott. 



1390. Geschwind, Andreas. Das Vorkommen des Hallimasch (Agaricus malleus Quel.) 

 in den Bosnisch-herzegowinischen Waldern. [The occurrence of a honey mushroom in the 

 forests of Bosnia-Herzegowina.] Naturw. Zeitschr. Forst- u. Landw. 18: 182-186. 1920. — 

 Armillaria inellea is as common in the more or less natural forests of this province as it is in 

 those of central Europe, but it is less destructive than in the cultural forests of the latter. 

 Under natural conditions, beech and aspen, when in mixture with softwoods, protect the 

 latter by acting as hosts for the disease. Wherever the beech is removed from the forest to 

 make room for softwood reproduction, the result is that the desired reproduction does not 

 come and the softwood falls prey to the fungus. The common practice of opening the forest, 

 when a part of a meadow unit, to induce the growth of grasses, furnishes ideal conditions for 

 the entrance of bark-beetles and the honey mushroom. In the extensive forests of the plains 

 ("Karstwalder"), the physical conditions of the soil furnish less ideal conditions for the 

 spread of the rhizomorphs through the soil than do the other forests.^/. Roeser. 



1391. Godfrey, G. H. A seed-borne Sclerotiumand its relation to a rice-seedling disease. 

 Phytopath. 10: 342. 1920. — The author notes the occurrence of a seed-borne Sclerotium of 

 rice in Louisiana and its relation to a seedling blight. The possibility of hot water seed- 

 treatment is suggested. — W. H. Tisdale. 



1392. Hahn, G. G. Phomopsis juniperovora, a new species causing blight of nursery 

 cedars. Phytopath. 10:249-253. 1 pi. 1920.— Study of a fungus causing a widespread 

 nursery blight of Juniperus virginiana from New York to Kansas indicates that a new species 

 is involved. The fungus is similar to Phomopsis thujae, a European form. Greenhouse 

 inoculations on Thuja gave positive results, but negative ones were obtained on Abies, Picea, 

 and Pinus. — P. V. Siggers. 



1393. Hamblin, Chas. O. Flag smut and its control. Agric. Gaz. New South Wales 32 : 

 23. 1921. — Notes are given on the disease and hints as to its control. — L. R. Waldron. 



1394. Harter, L. L., and J. L. Weimer. Sweet potato stem rot and tomato wilt. Phyto- 

 path. 10: 306-307. 1920. — The authors report negative results from inoculating sweet pota- 

 toes and tomatoes, using respectively Fusarium lycopersici from tomatoes and Fusarium 

 hyperoxysporum from sweet potato. — William B. Tisdale. 



1395. Hartley, Carl, and Glenn G. Hahn. Notes on some diseases of aspen. Phyto- 

 path. 10: 140-147. 3 fig. 1920.— The authors describe certain diseases found on the aspen 

 in the Pike's Peak region of Colorado. Much damage to leaves is often caused by Sclerotinia 

 bifrons, very little damage by Melampsora albertensis but a premature defoliation by M. 

 medusae, and a blighting of leaves and lateral twigs by Marsonia populi. Twig troubles and 

 cankers on trunk and stem are described but no causal organism has been found. Fames 

 igniarius causes rot and premature death of the aspen. — E. M. Gilbert. 



