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1 April 2010 Bioassay of the Herbicidal Activity of AAC-Toxin Produced by Alternaria alternata Isolated from Ageratina adenophora
Sheng Qiang, Ling Wang, Ran Wei, Bing Zhou, Shiguo Chen, Yunzhi Zhu, Yunfa Dong, Chuanfu An
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Abstract

Tenuazonic acid (TeA), a naturally occurring product of Alternaria alternata, a pathogen to croftonweed, was discovered to be a novel natural photosystem II (PSII) inhibitor. However, herbicidal activity of AAC-toxin, a metabolite of this fungus containing TeA as the main active ingredient, has not been evaluated systematically. In this study, we conducted activity-evaluation experiments in the laboratory, greenhouse, and field trials to assess the herbicidal potential of this fungal metabolite. AAC-toxin had high herbicidal activity on all species tested: croftonweed, large crabgrass, barnyardgrass, redroot pigweed, and eclipta. The AAC-toxin caused brown, leaf spot symptoms and leaf necrosis, subsequently killing the seedlings. When AAC-toxin was applied POST at 83 ml ai/ha, more than 95% of large crabgrass, barnyardgrass, and redroot pigweed plants were controlled 2 d after treatment in field trials. It can be concluded that AAC-toxin has broad-spectrum, rapid, and high herbicidal activity similar to that of paraquat and may have the potential to be developed as a microbe-based herbicide.

Sheng Qiang, Ling Wang, Ran Wei, Bing Zhou, Shiguo Chen, Yunzhi Zhu, Yunfa Dong, and Chuanfu An "Bioassay of the Herbicidal Activity of AAC-Toxin Produced by Alternaria alternata Isolated from Ageratina adenophora," Weed Technology 24(2), 197-201, (1 April 2010). https://doi.org/10.1614/WT-D-09-00016.1
Received: 4 August 2009; Accepted: 1 February 2010; Published: 1 April 2010
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KEYWORDS
Biobased herbicide, biological control, natural product, weed
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