Abstract
ABSTRACT Rhizoctonia spp. were isolated from the roots of apple trees and associated soil collected in orchards located near Moxee, Quincy, East Wenatchee, and Wenatchee, WA. The anastomosis groups (AGs) of Rhizoctonia spp. isolated from apple were determined by hyphal anastomosis with tester strains on 2% water agar and, where warranted, sequence analysis of the rDNA internal transcribed spacer region and restriction analysis of an amplified fragment from the 28S ribosomal RNA gene were used to corroborate these identifications. The dominant AG of R. solani isolated from the Moxee and East Wenatchee orchards were AG 5 and AG 6, respectively. Binucleate Rhizoctonia spp. were recovered from apple roots at three of four orchards surveyed and included isolates of AG-A, -G, -I, -J, and -Q. In artificial inoculations, isolates of R. solani AG 5 and AG 6 caused extensive root rot and death of 2- to 20-week-old apple transplants, providing evidence that isolates of R. solani AG 6 can be highly virulent and do not merely exist as saprophytes. The effect of binucleate Rhizoctonia spp. on growth of apple seedlings was isolate-dependent and ranged from growth enhancement to severe root rot. R. solani AG 5 and AG 6 were isolated from stunted trees, but not healthy trees, in an orchard near Moxee, WA, that exhibited severe symptoms of apple replant disease, suggesting that R. solani may have a role in this disease complex.
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Claims 6
Claim · model-written summary
The dominant anastomosis group of R. solani isolated from the Moxee orchard was AG 5.
- Taxon
- Apple
Malus domesticat0 - Interactor
- R. solani
Rhizoctonia solanie0pathogen - Outcome
- dominant AGe0
- Value
- AG 5e0
- Setting
- Moxeee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Isolated from Apple Roots and Orchard Soils”
e0“The dominant AG of R. solani isolated from the Moxee and East Wenatchee orchards were AG 5 and AG 6, respectively”
Claim · model-written summary
The dominant anastomosis group of R. solani isolated from the East Wenatchee orchard was AG 6.
- Taxon
- AppleMalus domesticat0
- Interactor
- R. solaniRhizoctonia solanie0pathogen
- Outcome
- dominant AGe0
- Value
- AG 6e0
- Setting
- East Wenatcheee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Isolated from Apple Roots and Orchard Soils”
e0“The dominant AG of R. solani isolated from the Moxee and East Wenatchee orchards were AG 5 and AG 6, respectively”
Claim · model-written summary
Binucleate Rhizoctonia spp. were recovered from apple roots at three of four orchards and included isolates of AG-A, -G, -I, -J and -Q.
- Taxon
- appleMalus domesticae0
- Interactor
- Binucleate Rhizoctonia spp.e0pathogen
- Outcome
- recoverede0
- Value
- three of four orchardse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Binucleate Rhizoctonia spp. were recovered from apple roots at three of four orchards surveyed and included isolates of AG-A, -G, -I, -J, and -Q”
Claim · model-written summary
In artificial inoculations, R. solani AG 5 and AG 6 isolates caused extensive root rot and death of 2- to 20-week-old apple transplants.
- Taxon
- appleMalus domesticae0
- Organ / stage
- 2- to 20-week-old apple transplantse0
- Treatment
- artificial inoculationse0
- Interactor
- R. solani AG 5 and AG 6e0pathogen
- Outcome
- extensive root rot and deathe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In artificial inoculations, isolates of R. solani AG 5 and AG 6 caused extensive root rot and death of 2- to 20-week-old apple transplants”
Claim · model-written summary
The effect of binucleate Rhizoctonia spp. on apple seedling growth depended on the isolate, ranging from growth enhancement to severe root rot.
- Taxon
- appleMalus domesticae0
- Treatment
- binucleate Rhizoctonia spp.e0
- Interactor
- binucleate Rhizoctonia spp.e0pathogen
- Outcome
- growth of apple seedlingse0
- Qualifier
- isolate-dependente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of binucleate Rhizoctonia spp. on growth of apple seedlings was isolate-dependent and ranged from growth enhancement to severe root rot”
Claim · model-written summary
R. solani AG 5 and AG 6 were isolated from stunted apple trees but not healthy trees in an orchard near Moxee with severe apple replant disease; the authors suggest R. solani may have a role in the disease complex.
- Taxon
- appleMalus domesticae0
- Interactor
- R. solani AG 5 and AG 6e0pathogen
- Outcome
- stunted treese0
- Setting
- an orchard near Moxee, WAe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“R. solani AG 5 and AG 6 were isolated from stunted trees, but not healthy trees, in an orchard near Moxee, WA, that exhibited severe symptoms of apple replant disease”
The same questions in other papers
inoculation · disease · Malus domestica (apple)Positive and negative results
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See all 63 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.