摘要:

SUMMARYAn organism culturally resemblingBacillus lathyriManns and Taubenhaus has been isolated fromAphis rumicisLinn. The aphides showed evidence of disease, in that they died within 24 hours of removal from the host plant. Bacteriological examination of healthy aphides indicated that they are remarkably free from bacteria; few colonies were found in cultures, even when made from the crushed insects.The writer desires to express his gratitude to Dr F. Tattersfield, of Rothamsted Experimental Station, for the provision of a normal colony ofA. rumicis; to Dr Mary Barratt, of the Lister Institute, for confirmation of certain of the cultural characteristics; and to his colleagues on the staff of the Cooper Technical Bureau, who have given him helpful advice.

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1937.tb05026.x

出版商:Blackwell Publishing Ltd    

年代:1937

数据来源: WILEY

摘要:

SUMMARYThe number of anaerobic spores in fresh grass appears always to be small but, in silage made from such grass, this group of organisms increases in numbers after the first few days until approximately 1,000,000 or rather more per g. are present, and these high numbers are maintained usually for several weeks. In silages made from young spring grassClostridium sporogeneswas isolated at all stages of ripening, and no other types were found in comparable numbers. In silage made from autumn grass, however, which had a considerably higher moisture content owing to inefficient drainage in the silos, and in silage made from similar grass to which various substances containing available carbohydrates had been added at the time of ensiling, strains of saccharolytic anaerobes were isolated in addition toCl. sporogenes.

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1937.tb05027.x

出版商:Blackwell Publishing Ltd    

年代:1937

数据来源: WILEY

摘要:

SUMMARYQuantitative1A direct correlation has been found between soil fertility as measured by crop growth, and the number of fungi and actinomycetes‐in Barnfield (permanent mangold) and Broadbalk (permanent wheat) at the Rothamsted Experimental Station.2Inconclusive or negative evidence has been obtained with regard to the phenomenon of periodicity in the fungi and actinomycetes in the soil. Evidence, on the whole, seems to suggest that numbers throughout the year scatter about a mean value with an indication of lower numbers in the winter.3No marked and dominant effect of the crop has been observed upon the numbers of fungi and actinomycetes beyond a suggestion that the wheat field, on the whole, contains a greater number of actinomycetes than Barnfield while the reverse is the case for the fungi.Qualitative1The results do not favour the view that there exist specific soil fungus floras determined by particular manurial treatments. The more fertile plots contain, however, a greater variety of soil fungi.2In the two fields different soil forms exist in different quantities.Penicilliumand forms ofDematiumare more prevalent in Barnfield whileFusariumtends to predominate in Broadbalk.Forms ofMoniliaoccur fairly uniformly in the two fields. Species ofAspergillusandMucorare scarce in the two field

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1937.tb05028.x

出版商:Blackwell Publishing Ltd    

年代:1937

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1937.tb05029.x

出版商:Blackwell Publishing Ltd    

年代:1937

数据来源: WILEY

摘要:

The Scientific Principles of Plant Protection, with Special Reference to Chemical Control.By H. Martin.Citrus Diseases and Their Control.By HowardS. Fawcett.Diseases and Pests of the Rubber Tree.By ArnoldSharplesHumus: Origin, Chemical Composition, and Importance in Nature.By S. A. Waksman.Illustrated Polyglottic Dictionary of Plant Names.By A. K. Bedevian.Erkennen, Nachweis und Kultur der holzverfärbenden und holzzersetzenden Pilze.Von W. Bavendamm, reprinted fromHandbuch der biologischen ArbeitsmethodenBiological Effects of Radiation.Edited by B. M. Duggar.Pollen Grains: their Structure, Identification and Significance in Science and Medicine.By R. P. Wodehouse.Botany: a Textbook for Colleges.By J. BenHill, L. O. Overholtsand H. W. Popp.J. Arthur Harris; Botanist and Biometrician.Edited by C. O. Rosendahl, R. A. Gortnerand G. O. Burr

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1937.tb05030.x

出版商:Blackwell Publishing Ltd    

年代:1937

数据来源: WILEY