Alternaria alternantherae: A New Species Found on Alligatorweed

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

doi:10.2307/3758732

Cited by 6 publications

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“…(Amaranthaceae; Alligatorweed) has been mostly successful along the Gulf coast of the US, where winters are warm and its primary control agent, Agasicles hygrophila Selman and Vogt (Coleoptera: Chrysomelidae; Alligatorweed Flea Beetle), overwinters successfully (Buckingham 1996, Coulson 1977, Vogt et al 1992. In 1975, the pathogenic fungus, Alternaria alternantherae Holcomb & Antonop., was discovered producing characteristic purple leaf lesions on Alligatorweed plants near Baton Rouge, LA (Holcomb 1978, Holcomb andAntonopoulos 1976,). Subsequent studies found A. alternantherae to be highly damaging to Alligatorweed plants but posed a risk to several non-target species (Barreto and Torres 1999, Holcomb 1978, Pomella et al 2007).…”

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confidence: 99%

Spatial and temporal variability of the Alligatorweed pathogen, Alternaria alternantherae, in Louisiana

Harms¹,

Shearer²

2022

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Alligatorweed leaf spot is a disease of invasive Alternanthera philoxeroides (Alligatorweed) in the southern US, caused by Alternaria alternantherae. However, little is known about when or where this pathogen naturally occurs. To better understand this species’ life history, we examined temporal (every 2–3 weeks) and spatial (latitudinal) patterns of A. alternantherae occurrence at sites in Louisiana for 2 y. Pathogen presence reflected clear within-year temporal and spatial patterns. Overall, the percentage of leaves infected with A. alternantherae was low during spring each year (0–20% infected) but increased throughout summer (maximum of 50% infected), and plants in northern sites had lower frequency of infection relative to southern sites until later in the year (late summer/early fall) but only in 1 of the 2 years of our study. The mean proportion of leaves infected with A. alternantherae declined with latitude both years (P = 0.01) and variability increased with latitude (P = 0.04), a pattern suggestive of range limitation in northern areas. We estimate a northern distributional limit of 34°N for A. alternantherae in Louisiana, but Alligatorweed occurs farther north. Although we did not directly examine disease impacts to Alligatorweed during the study, they may be greatest in southern areas, where the pathogen is more common early and throughout the growing season, and thus may be less likely to provide control in northern infestations of the invasive Alligatorweed.

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Section: Introductionmentioning

confidence: 99%

Spatial and temporal variability of the Alligatorweed pathogen, Alternaria alternantherae, in Louisiana

Harms¹,

Shearer²

2022

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

2005

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“…N. alternantherae naturally causes severe infection on A. philoxeroides producing leaf spots resulting in severe defoliation and occasionally death. Nimbya alternantherae has previously been reported to cause similar disease on A. philoxeroides in South America (Barreto & Torres, 1999), USA (Holcomb & Antonopoulos, 1976) and China (Xiang et al, 1998). However, from Australia a morphologically different isolate of Nimbia was found to be associated with A. philoxeroides causing similar disease symptoms (Gilbert et al, 2005).…”

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“…cultural characteristics. Nimbya alternantherae was originally described as Alternaria alternantherae Holcomb & Antonop., a pathogen causing leaf spot disease of A. philoxeroides (Holcomb & Antonopoulos, 1976;Holcomb, 1978). A representative specimen of N. alternantherae from A. philoxeroides was deposited in the Herbarium First Fungal Culture Bank of Pakistan (FCBP), Institute of Agricultural Sciences (IAGS), P.U., Lahore, on living leaves of A. philoxeroides with Accession No.…”

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Nimbya alternantherae reported for the first time to cause leaf and stem necrosis of Alternanthera philoxeroides (alligatorweed) in Pakistan

Akhtar¹,

Sarwar²,

Ul-Haq³

2012

Trop. plant pathol.

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A severe leaf and stem necrosis disease of Alternanthera philoxeroides (alligatorweed) was examined in the summer of 2011. Symptoms on leaves and stems of A. philoxeroides consisted of round to oval straw colored spots with maroon margins resulting in chlorosis, severe defoliation and withering of stems. The causal pathogen isolated on V-8 agar medium was morphologically identified as Nimbya alternantherae. Pathogenicity of N. alternantherae was proven on healthy A. philoxeroides plants. This is the first report of A. philoxeroides necrosis caused by N. alternantherae in Pakistan.

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Alternaria alternantherae: A New Species Found on Alligatorweed

Cited by 6 publications

References 0 publications

Spatial and temporal variability of the Alligatorweed pathogen, Alternaria alternantherae, in Louisiana

Spatial and temporal variability of the Alligatorweed pathogen, Alternaria alternantherae, in Louisiana

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

Nimbya alternantherae reported for the first time to cause leaf and stem necrosis of Alternanthera philoxeroides (alligatorweed) in Pakistan

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