Periodical Literature. 531 



area partly healed over, the new tissue forming both xylem and 

 phloem. 



A description of culture experiments is given, in which var- 

 iations in growth and spore characters is very marked under the 

 different conditions. In some cases the conidia are the same as 

 in the form-genus Monochetia, while in starved cultures the hair- 

 like appendages are frequently lacking, thus passing into the 

 Hendersonia type ; other spores are identical with those produced 

 by the close relative, Coryneum pestalozzioides Sacc. 



The ordinary recommendation for the control of the disease is 

 to burn all infected plants, but this is not enough. The conidia 

 adhere to the plants and are washed down to the soil by rains and 

 dew, which fact probably largely accounts for infection at the base 

 of the stem. To overcome this difficulty the soil, in bad cases of 

 the disease, should be turned under. 



Pestalozzia hartigii Tuhetif. En ny friende i vara plantskdlor. Skogs- 

 vards foreninger. Tidskrift. May 191 1. Pp. 183-195, figs. i-io. 



Another paper on this topic from Carl 

 Damping-off Hartley, who has been investigating nur- 



of sery troubles for the office of Forest Path- 



Seedlings. ology for the past three or four years, 



should be of great interest to all engaged in 

 raising forest seedlings. The paper presents the latest results on 

 chemical soil treatments to prevent damping-off. The work was 

 conducted at the Halsey nursery in the Nebraska sand hills, where 

 the soil is sand with considerable humus in the upper layers. 

 Pythium deharyanum is the most serious fungus, although Rhiz- 

 octonia sp. and Pusarium sp. cause some damage. The two 

 former kill germinating seed as well as seedlings. Thirteen 

 chemicals and seven combinations have been tried. It was found 

 unsafe to apply fungicides after germination. Formalin or 

 mercuric chloride can kill even dormant seed. The application 

 of sulfuric acid 3/16 f\. oz. per square foot, to the seed beds 

 proved most satisfactory, both as to its immediate effect and its 

 subsequent ability to prevent re-infection. Acid injury to the 

 young roots was obviated by light sprinkling twice a day during 

 the germination period to prevent the capillary rise of the acid 

 in the soil. Commercial hydrochloric and nitric acids are about 



34 



