<i>Alternaria Alternantherae:</i>A New Species Found on Alligatorweed

Holcomb, G. E.; Antonopoulos, A.A.

doi:10.1080/00275514.1976.12019998

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…Preliminary inoculation studies suggested that the former might have potential as a mycoherbicide. This fungus is also known to occur in the USA (Holcomb and Antonopoulos, 1976) and Australia (Simmonds, 1995), where it was recently recollected by B. Auld (Orange Agricultural Institute, Australia, personal communication). It causes purple foliar and stem lesions that later become brown and necrotic resulting in defoliation under natural conditions ( Figure 1).…”

Section: Introductionmentioning

confidence: 93%

Nimbya alternantherae a potential biocontrol agent for alligatorweed, Alternanthera philoxeroides

2006

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Alligatorweed, (Alternanthera philoxeroides (Mart.) Griseb.), an aquatic and wetland plant native to South America, is an aggressive weed in many parts of the world. Its ability to compete with other native plants and to impede waterways has made it a serious threat to aquatic ecosystems. Although biological control with insects has been fairly successful in aquatic habitats, there is a need for additional agents to manage the weed in upland sites. Accordingly, in a survey in Brazil in 1997 a fungus, Nimbya (=Alternaria) alternantherae (Holcomb and Antonopoulus) Simmons and Alcorn, was discovered and confirmed to be highly damaging to alligatorweed. Studies were conducted to determine the potential of this fungus for controlling this weed. Several isolates from Brazil, USA, and Puerto Rico were compared and no differences in virulence were observed, although a lower dew requirement was demonstrated for the Brazilian isolates. Conidia were more effective than mycelial suspension, and inoculum concentrations of 1 · 10 5 and 1 · 10 6 conidia per ml provided significant levels of control of the weed in greenhouse and field experiments, respectively. In a host-range study, N. alternantherae infected 6 plant species from a total of 42 species belonging to 23 families. N. alternantherae has the potential to be an effective mycoherbicide for alligatorweed.

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Section: Introductionmentioning

confidence: 93%

Nimbya alternantherae a potential biocontrol agent for alligatorweed, Alternanthera philoxeroides

2006

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“…Given the limitations of biological control use in the northern range of the plant, novel and innovative solutions are needed to reduce A. philoxeroides impacts in those areas. In 1976, a fungal pathogen identified as Alternaria alternantherae ( Figure 2) was discovered on A. philoxeroides plants near Baton Rouge, LA (Holcomb and Antonopoulos 1976). The fungus develops small purple lesions on leaves, which become necrotic over time, leading to leaf senescence and abscission from the plant (Holcomb 1978).…”

Section: Introductionmentioning

confidence: 99%

A first examination of the interaction between Alternaria alternantherae and Agasicles hygrophila on Alternanthera philoxeroides

Harms¹,

Shearer²

2020

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The use of an alligatorweed (Alternanthera philoxeroides) insect biological control agent, alligatorweed flea beetle (Agasicles hygrophila Selman and Vogt), and the leaf spot plant pathogen, alligatorweed leaf pathogen (Alternaria alternantherae Holcomb and Antonopoulis), may provide enhanced control of alligatorweed infestations if competitive interactions between agents are minimal and damage to host plants are synergistic. However, to assess suitability of co-use of these two agents, it is necessary to first identify whether introduction of one may impact performance of the other. This technical note details a first examination of competitive interactions between A. hygrophila and A. alternantherae under varied temperature and host nutritional conditions. Presented are the results of laboratory experimentation and recommendations for future research.

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“…Nimbya alternantherae causes similar symptoms on alligatorweed in South America (Barreto & Torres, 1999), USA (Holcomb & Antonopoulos, 1976) and China (Xiang et al ., 1998). However, conidial morphology (beak length, body length, width, shape, septation and ornamentation) of the NSW isolates does not fit the description of N. alternantherae (Simmons, 1995 and personal communication).…”

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confidence: 98%

Leaf and stem spot of Alternanthera philoxeroides (alligatorweed) in Australia caused by Nimbya sp.

2005

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Alternaria Alternantherae:A New Species Found on Alligatorweed

Cited by 6 publications

References 4 publications

Nimbya alternantherae a potential biocontrol agent for alligatorweed, Alternanthera philoxeroides

Nimbya alternantherae a potential biocontrol agent for alligatorweed, Alternanthera philoxeroides

A first examination of the interaction between Alternaria alternantherae and Agasicles hygrophila on Alternanthera philoxeroides

Leaf and stem spot of Alternanthera philoxeroides (alligatorweed) in Australia caused by Nimbya sp.

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