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Biological control of the Noogoora burr complex with Alternnria zinniae: environmental conditions favouring disease

Biological control of the Noogoora burr complex with Alternnria zinniae: environmental conditions... Alternaria zinniae is a fungal pathogen of weeds in the Noogoora burr complex. The effects of environment on infection and disease development were studied quantitatively by inoculating plants of Xanthium occidentale (Noogoora burr) and Xanthium italicum (Hunter burr) in a spore settling tower and incubating them in environmentally controlled dew chambers. Leaf necrosis was greatest on both plant species after dew periods of 18 h. Forty percent of the maximum leaf necrosis was observed after dew periods of 8 h or longer. Leaf necrosis was greatest when plants were subjected to temperatures of 15–20°C during the dew period and of 25°C after the dew period. Disease resistance was increased by water stress prior to the dew period but was greatly decreased by water stress after the dew period. Given favourable conditions in the field, A. zinniae has potential to control weeds in the Noogoora burr complex. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Australasian Plant Pathology Springer Journals

Biological control of the Noogoora burr complex with Alternnria zinniae: environmental conditions favouring disease

Australasian Plant Pathology , Volume 29 (2) – Jan 28, 2011

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Publisher
Springer Journals
Copyright
Copyright © 2000 by Australasian Plant Pathology Society
Subject
Life Sciences; Plant Pathology; Plant Sciences; Agriculture; Entomology; Ecology
ISSN
0815-3191
eISSN
1448-6032
DOI
10.1071/AP00014
Publisher site
See Article on Publisher Site

Abstract

Alternaria zinniae is a fungal pathogen of weeds in the Noogoora burr complex. The effects of environment on infection and disease development were studied quantitatively by inoculating plants of Xanthium occidentale (Noogoora burr) and Xanthium italicum (Hunter burr) in a spore settling tower and incubating them in environmentally controlled dew chambers. Leaf necrosis was greatest on both plant species after dew periods of 18 h. Forty percent of the maximum leaf necrosis was observed after dew periods of 8 h or longer. Leaf necrosis was greatest when plants were subjected to temperatures of 15–20°C during the dew period and of 25°C after the dew period. Disease resistance was increased by water stress prior to the dew period but was greatly decreased by water stress after the dew period. Given favourable conditions in the field, A. zinniae has potential to control weeds in the Noogoora burr complex.

Journal

Australasian Plant PathologySpringer Journals

Published: Jan 28, 2011

References