Studies on germination of sclerotia of Sclerotium delphinii

Javed, Zoya; Coley‐Smith, J. R.

doi:10.1016/s0007-1536(73)80029-4

Cited by 11 publications

(5 citation statements)

References 13 publications

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“…Sclerotia, the overwintering bodies of the fungus, will be present as numerous, 1.1-to 2-mmdiameter (0.04-to 0.08-inch), reddish-brown spheres on the soil or infected tissues. Sclerotia are the most important diagnostic indicator of petiole rot, and enable the fungus to survive in the soil for two or more years (Javed and Coley-Smith, 1973). Sclerotia attached to the crowns are also probably the primary means of longdistance dissemination.…”

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confidence: 99%

Resistance of Hosta Cultivars to Petiole Rot Caused by Sclerotium rolfsii var. delphinii

Edmunds¹,

Wegulo²

2003

horttech

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Eighteen cultivars of hosta (Hosta spp.), selected to represent a wide range of size, leaf shape and color, and genetics, were evaluated for reaction to Sclerotium rolfsii var. delphinii in a greenhouse in Ames, Iowa in 2000 and 2001. Bare-root, single-eye plants were planted in 15.2-cm (6-inch) pots in a soil-containing (2000) and soilless (2001) mix and grown in a greenhouse for 3 months. Plants were then inoculated by placing a carrot disk infested with mycelium of S. rolfsii at the base of the plant. Disease severity was assessed weekly for 6 weeks as percent symptomatic petioles. Disease development varied significantly (P < 0.05) among cultivars. Overall, `Lemon Lime', `Munchkin', `Nakaiana', `Platinum Tiara', and `Tardiflora' had the most severe symptoms and `Halcyon' showed the least disease.

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confidence: 99%

Resistance of Hosta Cultivars to Petiole Rot Caused by Sclerotium rolfsii var. delphinii

Edmunds¹,

Wegulo²

2003

horttech

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“…In previous studies, sclerotia of S. rolfsii were found to survive from 2 months to 3 years in field soil (2) and S. rolfsii var. delphinii survived 6 months to 2 years (5,10,11,26,27). Some of those studies used sclerotia that were either produced on culture media or air dried before burial; it is likely, however, that conditions under which sclerotia are produced can impact their durability in survival trials.…”

Section: Discussionmentioning

confidence: 99%

“…In the United Kingdom, S. rolfsii var. delphinii was reported to survive in soil for 6 months to 2 years (10,27). Some studies used sclerotia that were produced on agar media; such sclerotia are morphologically and physiologically distinct from sclerotia produced by natural infections (12,18,20,22).…”

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confidence: 99%

Overwintering of Sclerotium rolfsii and S. rolfsii var. delphinii in Different Latitudes of the United States

Mueller

Esker

et al. 2008

Plant Disease

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Previously known only from the southern United States, hosta petiole rot recently appeared in the northern United States. Sclerotium rolfsii var. delphinii is believed to be the predominant petiole rot pathogen in the northern United States, whereas S. rolfsii is most prevalent in the southern United States. In order to test the hypothesis that different tolerance to climate extremes affects the geographic distribution of these fungi, the survival of S. rolfsii and S. rolfsii var. delphinii in the northern and southeastern United States was investigated. At each of four locations, nylon screen bags containing sclerotia were placed on the surface of bare soil and at 20-cm depth. Sclerotia were recovered six times from November 2005 to July 2006 in North Dakota and Iowa, and from December 2005 to August 2006 in North Carolina and Georgia. Survival was estimated by quantifying percentage of sclerotium survival on carrot agar. Sclerotia of S. rolfsii var. delphinii survived until at least late July in all four states. In contrast, no S. rolfsii sclerotia survived until June in North Dakota or Iowa, whereas 18.5% survived until August in North Carolina and 10.3% survived in Georgia. The results suggest that inability to tolerate low temperature extremes limits the northern range of S. rolfsii.

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“…Irrespective of the claims that sclerotia of S. rolfsii can survive in soil indefinitely (AYCOCK 1966), our observations showed that under controlled conditions of temperature and moisture, survivability decreased after 8 months in natural soil. JAVED and COLEY-SMITH (1973) observed that the germinability of the scierotia of 5. delphinii was markedly reduced between 6-9 months after burial in the field and very few sclerotia survived after 2 years except on the soil surface. We observed that with increasing time beyond 8 months the number of sclerotia actually recovered was less.…”

Section: Discussionmentioning

confidence: 99%

Effect of Moisture and Temperature on the Survival of Sclerotia of Sclerotium rolfsii in Soil

Maiti

Sen

1988

Journal of Phytopathology

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The sclerotia of Sclerotium rolfsii Sacc. survived in natural soil for 225 days under controlled moisture at 50 % water holding capacity (WHC) after which there was a progressive reduction in the population of viable sclerotia. At 390 days only 48 % were recovered. Sclerotia survived well at moisture contents upto 75 % WHC but at 100 % the population declined rapidly and none were recovered after 60 days. The contents of the sclerotia were found to lyse without germination leaving hollow rinds. Such lysis was found to be favoured between 25 and 40 °C. At and below 20 °C no such lysis was recovered and more than 80 % sclerotia were recovered even after 60 days. ZusammenfassungDer Einflufi der Feuchtigkeit und der Temperatur auf das Uberleben von Sclerotium ro/Zsii-Sklerotien in der Erde Sclerotium rolfsii Sacc.-Sklerotien in natiirlicher Erde iiberlebten 225 Tage unter kontrollierten Feuchtigkeitsbedingungen, die einer 50 %igen Wassersattigung (WHC) entsprachen, danach trat eine fortschreitende Reduktion der lebenden Sklerotienpopulation ein. Bei 390 Tagen konnten nur 48 % der Sklerotienpopulation wiedergefunden werden. Die Sklerotien iiberlebten Feuchtigkeitsbedingungen bis zu 75 %iger WHC gut, aber bei 100 %iger WHC baute sich die Population sehr schnell ab und nach 60 Tagen wurden keine Sklerotien wiedergefunden. Der Inhalt der Sklerotien loste sich, ohne zu keimen, auf, um hohle Rinden zu hinterlassen. Es wurde festgestellt, dafi die Auflosung bei Temperaturen zwischen 25 und 40 °C begiinstigt wurde. Bei Temperaturen um oder weniger als 20 °C wurde eine Auflosung nicht ermittelt und mehr als 80 % der Sklerotien wurden auch noch nach 60 Tagen wiedergefunden. U.S.

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Studies on germination of sclerotia of Sclerotium delphinii

Cited by 11 publications

References 13 publications

Resistance of Hosta Cultivars to Petiole Rot Caused by Sclerotium rolfsii var. delphinii

Resistance of Hosta Cultivars to Petiole Rot Caused by Sclerotium rolfsii var. delphinii

Overwintering of Sclerotium rolfsii and S. rolfsii var. delphinii in Different Latitudes of the United States

Effect of Moisture and Temperature on the Survival of Sclerotia of Sclerotium rolfsii in Soil

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