Inoculum concentration and the colonization of <i>picea sitchensis</i> stumps by basidiospores of <i>heterobasidion annosum</i>

Redfern, D. B.; Gregory, S. C.; MacAskill, G. A.

doi:10.1080/02827589709355382

Cited by 24 publications

(20 citation statements)

References 19 publications

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“…Redfern reported that most colonies in th stumps of Sitka spruce occurred in the heartwood (Redfern 1993;Redfern et al 1997). Redfern et al (1997) artificially inoculated stumps with spore loads of 5 -109 000 basidiospores⋅cm -2 with an infective capacity 600 times that of the same number of conidiospores (Kuhlman and Hendrix 1964). High spore loads may be necessary to achieve infection of Norway spruce heartwood whereas the establishment of H. annosum in sapwood does not require as many spores.…”

Section: Discussionmentioning

confidence: 98%

Effects of clear-cutting, thinning, and wood moisture content on the susceptibility of Norway spruce stumps to Heterobasidion annosum

Bendz‐Hellgren¹,

Stenlid²

1998

Can. J. For. Res.

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The effects of clear-cutting and thinning as well as heartwood and sapwood moisture content on spore infection by Heterobasidion annosum (Fr.) Bref. were investigated in summer cuttings in southern and central Sweden. At five sites, 20-100 stumps in clear-cut, thinned, and precommercially thinned stands of Norway spruce (Picea abies (L.) Karst.) were created and left for natural spore infection. An additional 20 stumps per stump type and site were artificially inoculated with conidiospores of H. annosum. The probability of natural infection was 0.73 and 0.53 for stumps in thinned and clear-cut stands, respectively. Almost all (95%) of the artificially inoculated stumps in thinned and clear-cut stands became colonized, and no differences due to stump type were found. The probability of infection of stumps in precommercially thinned stands was lower than for the other stump types of both naturally and artificially inoculated stumps. The proportion of colonized sapwood was reduced with increasing moisture content. Stump colonization seemed unaffected by temperature, even though stump temperatures exceeded 40°C for 2 h at one site.Résumé : Les effets de la coupe à blanc, de l'éclaircie et du contenu en eau du bois de coeur et du bois d'aubier sur l'infection par les spores de Heterobasidion annosum (Fr.) Bref. ont été investigués suite à des coupes effectuées en été dans le sud et le centre de la Suède. Dans cinq sites, de 20 à 100 souches furent soumises à l'infection naturelle dans des peuplements d'épicéa commun (Picea abies (L.) Karst.) qui avaient subi une coupe à blanc, une coupe d'éclaircie ou une éclaircie précommerciale. Vingt souches additionnelles par type de souches et par site furent inoculées artificiellement avec des conidies de H. annosum. Les probabilités d'infection naturelle étaient respectivement de 0,73 et 0,53 dans les peuplements éclaircis et coupés à blanc. Presque toutes les souches (95%) inoculées artificiellement dans les peuplements éclaircis et coupés à blanc ont été colonisées et il n'y avait pas de différence entre les types de souches. Dans les peuplements qui avaient subi une éclaircie précommerciale, la probabilité d'infection des souches était plus faible que pour les autres types de souches que l'inoculation soit naturelle ou artificielle. La proportion de bois d'aubier colonisé diminuait avec l'augmentation du contenu en eau. La colonisation des souches n'a pas semblé affectée par la température même si la température des souches a excédé 40°C pendant 2 h dans un site.[Traduit par la Rédaction]

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Section: Discussionmentioning

confidence: 98%

Effects of clear-cutting, thinning, and wood moisture content on the susceptibility of Norway spruce stumps to Heterobasidion annosum

Bendz‐Hellgren¹,

Stenlid²

1998

Can. J. For. Res.

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“…The variation among sites can also be attributed to biotic or abiotic factors, such as the ambient spore load (Redfern et al. ) and weather conditions (Redfern ; Brandtberg et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…However, the high concentration of spores might introduce strong intraspecific competition (Redfern et al. ), which can give an artificial advantage to P. gigantea . In our study, the natural conditions in which the experiment was conducted resemble the practical situation and the natural level of variation in the control efficacy of stump treatment agents.…”

Section: Discussionmentioning

confidence: 99%

The effect of Phlebiopsis gigantea and urea stump treatment against spore infection of Heterobasidion spp. on hybrid larch (Larix × eurolepis) in southern Sweden

Wang

Pålsson

et al. 2012

Forest Pathology

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Summary The efficacy of stump treatment with 40% urea solution and spore suspension of Phlebiopsis gigantea against primary infection by Heterobasidion spp. on hybrid larch (Larix × eurolepis) was tested in two field studies in southern Sweden. In the first study, stumps treated with urea or P. gigantea were sampled by cutting a cross‐section disc after 3 months following exposure to natural conditions, and in the second study, stumps treated with only P. gigantea were sampled after 2 months. Spore traps made from hybrid larch, Norway spruce (Picea abies) and Scots pine (Pinus sylvestris) were used to estimate the abundance of ambient spores of Heterobasidion spp. in the second study. Urea significantly reduced infection frequency of Heterobasidion spp. compared to the control. Phlebiopsis gigantea was less effective at reducing infection frequency in the first study than in the second study. Infections were caused by both H. parviporum and H. annosum sensu stricto. The amount of H. annosum infection in proportion to Heterobasidion spp. was significantly lower on the stumps treated with P. gigantea compared to the control; however, the proportion of H. parviporum on the treated stumps was not higher than the control in the first study. Spore traps made of Scots pine had a significantly higher frequency of infection than Norway spruce and hybrid larch. Only the spore traps made of hybrid larch showed significant correlation with the control stumps in terms of relative infected area. Conclusively, it seems prudent to protect hybrid larch stumps from primary infection by Heterobasidion spp., and both urea and P. gigantea can be recommended as stump treatment agents on hybrid larch, even if urea seemed to present more stable results.

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“…Up to 35% of the variation in sapwood growth in inoculated cuttings was explained by the genetic constitution of the host . Individual stumps of Norway spruce and Sitka spruce (Picea sitchensis) have shown to be more or less susceptible to both natural and artificial spore infection with H. annosum (Redfern, 1993;Redfern et al, 1997;Bendz-Hellgren, 1997). No investigation has so far been made on the difference in frequency of H. annosum decay in stands of Norway spruce clones or families.…”

Section: Introductionmentioning

confidence: 97%

Variation in incidence and genetic impact on natural infection of Heterobasidion annosum in Picea abies (L.) Karst. in genetic trials in south Sweden

Swedjemark

Karlsson

2004

Forest Ecology and Management

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Inoculum concentration and the colonization of picea sitchensis stumps by basidiospores of heterobasidion annosum

Cited by 24 publications

References 19 publications

Effects of clear-cutting, thinning, and wood moisture content on the susceptibility of Norway spruce stumps to Heterobasidion annosum

Effects of clear-cutting, thinning, and wood moisture content on the susceptibility of Norway spruce stumps to Heterobasidion annosum

The effect of Phlebiopsis gigantea and urea stump treatment against spore infection of Heterobasidion spp. on hybrid larch (Larix × eurolepis) in southern Sweden

Variation in incidence and genetic impact on natural infection of Heterobasidion annosum in Picea abies (L.) Karst. in genetic trials in south Sweden

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