Development of phoma lesions on oilseed rape leaves inoculated with ascospores of A-group and B-group Leptosphaeria maculans (stem canker) at different temperatures and wetness durations

A - Papers appearing in refereed journals

Toscano-Underwood, C., West, J. S., Fitt, B. D. L., Todd, A. D. and Jedryczka, M. 2001. Development of phoma lesions on oilseed rape leaves inoculated with ascospores of A-group and B-group Leptosphaeria maculans (stem canker) at different temperatures and wetness durations. Plant Pathology. 50 (1), pp. 28-41.

AuthorsToscano-Underwood, C., West, J. S., Fitt, B. D. L., Todd, A. D. and Jedryczka, M.
Abstract

In controlled-environment experiments, ascospores of both A-group and B-group Leptosphaeria maculans were able to infect leaves of oilseed rape and produce phoma leaf spot lesions at temperatures from 5 to 20 degreesC and wetness durations from 8 to 72 h after inoculation. Lesions formed on leaves inoculated with B-group ascospores had few pycnidia and were darker, smaller and less noticable than the larger, pale grey lesions with many pycnidia produced by A-group ascospores. Lesions formed by A-group or B-group L. maculans on naturally infected winter oilseed rape experimental crops were similar to lesions produced by the two groups on inoculated plants. The greatest numbers of lesions were produced with a leaf wetness duration of 48 h and at temperatures of 15-20 degreesC for both A-group and B-group ascospores. As leaf wetness duration and temperature decreased below the optimal values, the number of lesions decreased. The incubation period, estimated as the time from inoculation to the appearance of the first lesions (t(1)), or the time to the appearance of 50% of the lesions (t(50)), of B-group was often shorter than that of A-group L. maculans. As temperature decreased below 20 degreesC, the length of the incubation period of both A-group and B-group L. maculans increased.

KeywordsAgronomy; Plant Sciences
Year of Publication2001
JournalPlant Pathology
Journal citation50 (1), pp. 28-41
Digital Object Identifier (DOI)doi:10.1046/j.1365-3059.2001.00526.x
Open accessPublished as non-open access
Funder project or code424
507
445
513
ISSN00320862
PublisherWiley

Permalink - https://repository.rothamsted.ac.uk/item/88740/development-of-phoma-lesions-on-oilseed-rape-leaves-inoculated-with-ascospores-of-a-group-and-b-group-leptosphaeria-maculans-stem-canker-at-different-temperatures-and-wetness-durations

Total views: 2

Total downloads: 0

Views this month: 0

Downloads this month: 0