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ABSTRACT IN the preface to this valuable work, the author explains the circumstances which led him to the study of the genera _Alternaria_ and _Stemphylium_. As plant pathologist to the seed
firm of J. E. Ohlsens Enke, he appears to have enjoyed absolute freedom with regard to research and every facility for carrying it out. Working in collaboration with the seed-testing
laboratory of the firm, he was thus provided with a unique opportunity of studying seed-borne fungi, among which _Alternaria_ and _Stemphylium_ play an important part. Every year he examined
several thousand seed lots, made isolations, carried out inoculation experiments, and studied the morphology of the various species. The results of his studies are presented in this
monumental work of 560 pages, copiously illustrated and well reproduced. The author's approach to the problem of these genera was to study the living fungi. Starting with single-spore
isolations, he selected from five to ten isolates one fully representative of the species as it occurred on the natural substratum, and so far as possible he isolated each species from
several hosts and in many instances at several different times from the same host. He also obtained cultures from the Centraalbureau voor Schimmelcultures, Baarn. His examinations comprised
morphological characters, physiological tests on temperature requirements and sporulation, and pathogenicity tests carried out on ten species of seedlings representative of ten families
grown in wide test-tubes containing filter paper and about 10 c.c. water. The rows of test-tubes were placed in racks covering the wall. The main result was recorded twelve days after
inoculation, but the incubation period was sometimes extended to eighteen days, five degrees of pathogenicity being recognized. These investigations are recorded in the special part of the
volume comprising some 300 pages. Danish Species of Alternaria and Stemphylium Taxonomy, Parasitism, Economical Significance. By Paul Neergaard. (Communication from the Phytopathological
Laboratory of J. E. Ohlsens Enke, Copenhagen.) Pp. 560. (Copenhagen: Einar Munks-gaard; London: Oxford University Press, 1945.) 60_s_. net. Access through your institution Buy or subscribe
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calculated during checkout ADDITIONAL ACCESS OPTIONS: * Log in * Learn about institutional subscriptions * Read our FAQs * Contact customer support Authors * S. P. WILTSHIRE View author
publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE WILTSHIRE, S. Danish Work on
_Alternaria_ and _Stemphylium_. _Nature_ 160, 313–314 (1947). https://doi.org/10.1038/160313b0 Download citation * Issue Date: 06 September 1947 * DOI: https://doi.org/10.1038/160313b0 SHARE
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