Reference Report for phyto_ref2
| Title: | Root and stem rot of soybean caused by Phytophthora sojae N. sp. |
| Authors: | Kaufmann, M.J., Gerdemann, J.W. |
| Source: | Phytopath. 1958, 48(4):201-208 |
| Abstract: | Isolates of a Phytophthora sp. responsible for root and stem rot of soyabean [36, p. 373] in Illinois, Ohio, and N. Carolina [35, p. 503] are referred to a new species, P. sojae Kaufmann & Gerdemann. A similar disease in Missouri, Indiana, and Ontario (Canada) [37, pp. 205, 437] is believed to be due to the same species. In Illinois stem rot is the predominant symptom. Of 8 inoculation techniques used, the most effective were: (1) the use of soil infested with the fungus grown on cornmeal sand medium or whole oats; (2) insertion of mycelial fragments into a slit in the hypocotyl; both distinguished susceptible from resistant varieties very effectively. Tested on a number of leguminous crops and cereals the fungus proved slightly pathogenic to lucerne seedlings and very slightly so to sweet clover, but to none of the others. The taxonomy and cultural characters in comparison with P. megasperma and P. cactorum [37, p. 372] are treated in detail. The pathogen is closely related to P. megasperma, being differentiated only by its less rapid growth rate in culture, its smaller oogonia (28.3-45.8, av. 37 µ.) and oospores (19.2-38.3, av. 31 µ), deep colour reaction with chlorzinc iodide, and its pathogenicity to soybean. |
SoyBase
Follow us on Twitter @SoyBaseDatabase
