First record of<i>Passalora calotropidis</i>in Australia and its generic position

Wilkinson, P.; Thomas‐Hall, Skye R.; Marney, Thomas S.; Shivas, R. G.

doi:10.1071/ap04074

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…(2005) . In Wilkinson et al. (2005) , the isolate’s morphology has similar diagnostic characters to those of Passalora calotropidis ( Braun 2000 ) and the phylogenetic analysis based on ITS placed the species in a single-strain lineage closely related to Pseudocercospora .…”

Section: Resultsmentioning

confidence: 92%

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Mycosphaerellaceae: Chaos or clarity?

Videira

Groenewald

Nakashima

et al. 2017

Studies in Mycology

135

171

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The Mycosphaerellaceae represent thousands of fungal species that are associated with diseases on a wide range of plant hosts. Understanding and stabilising the taxonomy of genera and species of Mycosphaerellaceae is therefore of the utmost importance given their impact on agriculture, horticulture and forestry. Based on previous molecular studies, several phylogenetic and morphologically distinct genera within the Mycosphaerellaceae have been delimited. In this study a multigene phylogenetic analysis (LSU, ITS and rpb2) was performed based on 415 isolates representing 297 taxa and incorporating ex-type strains where available. The main aim of this study was to resolve the phylogenetic relationships among the genera currently recognised within the family, and to clarify the position of the cercosporoid fungi among them. Based on these results many well-known genera are shown to be paraphyletic, with several synapomorphic characters that have evolved more than once within the family. As a consequence, several old generic names including Cercosporidium, Fulvia, Mycovellosiella, Phaeoramularia and Raghnildiana are resurrected, and 32 additional genera are described as new. Based on phylogenetic data 120 genera are now accepted within the family, but many currently accepted cercosporoid genera still remain unresolved pending fresh collections and DNA data. The present study provides a phylogenetic framework for future taxonomic work within the Mycosphaerellaceae.

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Section: Resultsmentioning

confidence: 92%

“…The isolate of Cercospora calotropidis used in our study was sterile and the specimen was unfortunately not preserved. The strain used in the present study has an ITS sequence that is 99 % similar to GenBank AY303969 , a Passalora calotropidis strain used by Wilkinson et al. (2005) .…”

Section: Resultsmentioning

confidence: 99%

Mycosphaerellaceae: Chaos or clarity?

Videira

Groenewald

Nakashima

et al. 2017

Studies in Mycology

135

171

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“…A pathogen, Passalora calotropidis (Ellis & Everh.) U.Braun, was recently found on calotrope in north Queensland, where it was associated with a damaging leaf spot disease, causing partial or total defoliation and tip and stem dieback (Wilkinson et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Calotrope (Calotropis procera) control

Vitelli¹,

Madigan²,

Wilkinson³

et al. 2008

Rangel. J.

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Calotrope [Calotropis procera (Aiton) W.T.Aiton] is an exotic shrub or small tree species that is currently invading the tropical savannahs of northern Australia. A chemical trial involving 11 herbicides and four application methods (foliar, basal bark, cut stump and soil applied) was undertaken to identify effective chemicals to control calotrope. Of the foliar herbicides tested, imazapyr provided 100% mortality at the rates applied, and the higher rate of metsulfuron-methyl killed 100% of the treated plants. The herbicides 2,4-D butyl ester, fluroxypyr, triclopyr and triclopyr/picloram killed greater than 80% of the plants when applied by a basal bark or cut stump (when cut 5 cm above ground level) method of application. Plants cut close to ground level (5 cm) were controlled more effectively than plants cut 20 cm above ground level. Chemical control (foliar and cut stump spraying) is a cost effective tool to treat calotrope densities <800 plants/ha. Adoption of pasture management practices that promote perennial grasses, in conjunction with strategic chemical control, would further increase the effectiveness and reduce the costs of controlling vast areas of this weed.

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“…The appearance of a dieback phenomenon during the course of the cutting depth experiment not only affected the results obtained but also demonstrated its potential to adversely affect the growth and survival of calotrope. The exact cause of the dieback has not been confirmed at this stage, but Wilkinson et al (2005) did record the presence of a new leaf spot disease of calotrope (Passalora calotropidis (Ellis & Everh.) U. Braun) in Australia which displays similar symptoms to those found on plants in the present study.…”

Section: Discussionmentioning

confidence: 95%

The cutting depth required to control calotrope (Calotropis procera) plants using mechanical techniques

Campbell

Roden²,

O’Donnell

et al. 2020

Rangel. J.

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Calotrope (Calotropis procera (Aiton) W.T. Aiton) is an exotic woody weed that has invaded northern Australia’s rangelands since being introduced in the early 1900s. To expand the range of control options beyond herbicide-based methods, we undertook a stem/root cutting experiment that helped quantify the potential for using mechanical control techniques. Individual, medium-sized (1.72±0.03m high) calotrope plants were cut off at ground level (0cm) or below ground (10 or 20cm) using either a pruning saw or mattock respectively. All calotrope plants cut at ground level reshot vigorously. After four months they had more than twice the number of stems (7.4±0.54) of the uncut control plants and by 12 months they were only 26cm shorter than the control plants. In contrast, all plants cut at 10 or 20cm below ground were killed. Some mortality also started occurring in the control and ground level (0cm) treatments after eight months, but appeared to be associated with a dieback phenomenon. Nevertheless, the results demonstrate the potential to use equipment that severs the root system below ground, such as blade ploughs and cutter bars. A subsequent stick raking demonstration achieved moderate plant mortality (72%) after 13 months, yet produced a six-fold increase in original plant density as a result of new seedling emergence. This finding supports the view that mechanical disturbance will often promote seedling recruitment, and land managers need to have the capacity to undertake follow-up control practices to avoid exacerbating the problem.

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First record ofPassalora calotropidisin Australia and its generic position

Cited by 7 publications

References 8 publications

Mycosphaerellaceae: Chaos or clarity?

Mycosphaerellaceae: Chaos or clarity?

Calotrope (Calotropis procera) control

The cutting depth required to control calotrope (Calotropis procera) plants using mechanical techniques

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