The occurrence and pathogenicity of uni‐ and binucleate Rhizoctonia and <i>Pythiaceae</i> fungi among conifer seedlings in Finnish forest nurseries

Lilja, Arja

doi:10.1111/j.1439-0329.1994.tb00984.x

Cited by 34 publications

(39 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This observation agrees with earlier belief that root dieback is a disease complex involving both Rhizoctonia and Oomycetous pathogens (LILJA 1994;BO šRJA 1995). and Pythium spp.…”

Section: Discussionsupporting

confidence: 93%

“…is often difficult to isolate and dead roots are readily colonized by saprophytic species (LILJA et al 1992;LILJA 1994). is often difficult to isolate and dead roots are readily colonized by saprophytic species (LILJA et al 1992;LILJA 1994).…”

Section: Discussionmentioning

confidence: 99%

“…is a major cause of root dieback in forest nurseries in Norway and Finland (VENN et al 1986;LILJA 1996;HIETALA 1998). (GALAAEN and VENN 1979;VENN et al 1986;LILJA et al 1992;LILJA 1994). Karst.)…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Effect of uninucleate Rhizoctonia on Scots pine and Norway spruce seedlings

Lilja

Rikala

2000

Forest Pathology

Self Cite

View full text Add to dashboard Cite

One-year-old container-grown seedlings were planted in spring on clear cut areas: the Norway spruce (Picea abies) on a moist upland site (Myrtillus-type) and Scots pine (Pinus sylvestris) on a dryish upland site (Vaccinium-type). While still in the nursery, half of the seedlings of each species had been inoculated during the previous summer, with a uninucleate Rhizoctonia sp., a root dieback fungus. At outplanting all the seedlings appeared healthy and had a normal apical bud, although the height of the inoculated seedlings was less than that of the uninoculated control seedlings. At the end of the first growing season after planting, the mortality of inoculated Scots pine and Norway spruce seedlings was 25 and 69%, respectively. After two growing seasons the mortality of inoculated seedlings had increased to 38% for Scots pine and 93% for Norway spruce. The mortality of control seedlings after two growing seasons in the forest was 2% for Scots pine and 13% for Norway spruce. After outplanting the annual growth of inoculated seedlings was poor compared with the growth of control seedlings. These results show that, although Rhizoctonia-affected seedlings are alive and green in the nursery, the disease subsequently affects both their survival and growth in the forest.

show abstract

“…This observation agrees with earlier belief that root dieback is a disease complex involving both Rhizoctonia and Oomycetous pathogens (LILJA 1994;BO šRJA 1995). and Pythium spp.…”

Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of uninucleate Rhizoctonia on Scots pine and Norway spruce seedlings

Lilja

Rikala

2000

Forest Pathology

Self Cite

View full text Add to dashboard Cite

show abstract

“…Numerous Pythium species have already been associated with conifers, conifer seedlings, and forest nursery soils (2,13,14,(16)(17)(18)(19)25,26,33,41,43). Of these, P aphanidennatum, P debaryanum, P. irreguläre, P. mamillatum, and P. ultimum were reported as the most common pathogenic species of conifer seedlings.…”

Section: Discussionmentioning

confidence: 97%

Influence of Isolation Method on Recovery of Pythium Species from Forest Nursery Soils in Oregon and Washington

Weiland

2011

Plant Disease

View full text Add to dashboard Cite

Weiland, J. E. 2011. Influence of isolation method on recovery of Pythium species from forest nursery soils in Oregon and Washington. Plant Dis. 95:547-553.Pythium species are common damping-off pathogens that can cause stunting, chlorosis, and death of conifer .seedlings in the Pacific Northwest (PNW) region of the United States. Despite the prevalence and importance of these pathogens in forest nurseries, relatively little is known about the identity of Pythium species associated with forest nursery soils in Washington and Oregon. A limited number of studies have reported P. aphanidermatum. P. irreguläre, P. mamilkilum, and P. ultimum as the predominant species in the PNW. but most studies of this genus in forest nurseries have not reported Pythium species identity. In an attempt to identify Pythium species associated with forest nursery soils, fteld surveys were conducted at three forest nurseries (two in Oregon and one in Washington) in 2(X)8 using three isolation methods. Pythium species were isolated by plating soil onto a semiselective medium or by baiting soil with rhododendron leaf disks and Douglas-fir needle segments. One hundred isolates were randomly selected from each isolation method at each nursery (900 isolates total) and identified on the basis of the internal transcribed spacer (ITS) sequence. Nineteen Pythium species were identified during the survey. Species richness and abundance were strongly influenced by both nursery and isolation method. Of the 3()() isolates obtained from each nursery. P. irreguläre was the most commonly isolated species from nursery A in Washington (65% incidence). P. 'vipa' and P. dissotocum were the most commonly isolated species from nurseries B and C in Oregon, respectively (53 and 47% incidence, respectively).

show abstract

“…Useimmat näistä, kuten monet Penicillium-ja Aspergillus-lajit, ovat hyvin yleisiä, mutta harmittomia tai pystyvät kasvamaan vain vaurioituneissa siemenissä. Kuitenkin monet sienet, kuten useat Alternaria, Chaetomium-, Fusarium-, Epicoccum-, Phoma-, Phomopsis-, Trichothecium-ja Rhizoctonia-lajit, voivat aiheuttaa taimipoltetta (Lilja 1979, Sutherland ym. 2002, Talgø ym.…”

Section: Siementen Käsittelyssä Tarttuvat Taudinaiheuttajatunclassified