268 PATHOLOGY [Bot. Absts., Vol. V, 



2046. Grove, O. Notes on the fruit blossom bacillus. Investigations on diseases of plants 

 and their treatment. Jour. Path and West and South Counties Soc. 5, 12: 124-128. 1917-18. 

 — The bacillus (specific name not mentioned) which causes disease of pear blossoms was iso- 

 lated from several samples of soil and is supposed to be common there in April, but not earlier 

 in the year. Cultures made from the roots of various plants yielded apparently the same or- 

 ganism. An experiment was carried on with plants grown in sterilized soil in pots, one set 

 of which was inoculated with cultures of the bacillus. It was found that the latter had a 

 decided beneficial effect upon the growth of the plants. A description is given of morphologi- 

 cal, cultural and some biochemical characters of the bacillus. — M . Shapovalov. 



2047. Hendrick, J. The use of lime in controlling finger-and-toe in turnips. Trans. 

 Highl. and Agric. Soc. Scotland V, 30: 137-145. 1918. —The author presents data to show that 

 the application of sufficient lime to neutralize the sourness and leave an excess carbonate of 

 lime in the soil will check or prevent finger-and-toe (Plasmodiophora brassicae) in turnips. — 

 J. I. Lauritzen. 



2048. Hess, E. Die Mistel auf dem schwarzen Walnussbaum (Juglans nigra). [Mistle- 

 toe on the black-walnut (Juglans nigra).] Schweiz. Zeitschr. Forstw. 71: 1-2. 1 fig. 1920. 

 — This is the first occurrence of mistletoe on black walnut recorded. It occurred in a park in 

 the village of Champagne, Waadtlander Zura. A possible explanation for its occurrence on 

 this species is the less astringent sap as compared to other nut trees. The mistletoe is sup- 

 posed to have been disseminated from nearby fruit trees. — J. V. Hofmann. 



2049. Honnet, G. Les hybrides en 1919. [1919 hybrids.] Rev. Vitic. 22:53-59. 1920 — 

 See Bot. Absts. 5, Entry 1744. 



2050. Howard, Albert. Spike disease of peach trees: an example of unbalanced sap- 

 circulation. Indian Forester 45: 611-617. 1919. — The characteristics of the spike disease of 

 sandalwood are similar to those of the peach. When the peach is budded on the almond, 

 unless there is close junction between bud-ring and seedling, there is a delayed union and a 

 callus tissue forms until the stock and scion are united. In the former case when the union 

 is perfect, the treegrows normally and vigorously; in the latter case development is slow and 

 the tree becomes "spiked," with the characteristics of form and of mineral and starch content 

 very similar to the sandal. It is suggested that the spike of sandal may be due to the 

 imperfect union of the root haustoria with the host. — E. N. Munns. 



2051. Hubert, Ernest E. Disposal of infected slash on timber-scale areas in the north- 

 west. Jour. Forestry 18: 34-56. 1920. — Factors of available water and food supply, resist- 

 ance of the host to sporophore production, temperature, humidity and light are most important 

 in the production of sporophores of wood-destroying fungi. These may be present in the 

 slash of cut-over areas and all the destructive wood-rotting fungi can develop on infected 

 slash. These are sources of infection to the remaining trees of the stand. Slash should be 

 burned or charred as far as possible or otherwise dragged into openings where the soil and air 

 is drier and warmer. This is not so important with the yellow pines as with the firs and cedars 

 because of the moister sites occupied by the latter. — E. N. Munns. 



2052. Kern, Frank D. Report of the botanist. Bull. Pennsylvania Dept. Agric. l l : 

 24-26. 1918. — Attention is called to the greater need for practicing the methods which have 

 already been worked out for the control of crop diseases. Statistics are given on the losses 

 to the oat, potato and apple crop occasioned by plant disease during the season 1917. — C. R. 

 Orton. 



2053. Klebahn, H. Haupt- und Nebenfruchtformen der Askomyzeten. Erster Teil: 

 Eigene Untersuchungen. [Perfect and imperfect stages of ascomycetes.] 395 p., 275 fig. 

 Gebr. Borntniger: Leipzig, 1918. 



