Abstract
Superficially, isolates of Rhizoctonia solani AG-7 and AG-4 appear to have similar cultural morphologies, and AG-7 isolates are often mistakenly identified as AG-4. It is important, therefore to develop methods for separation of AG-7 cultures from AG-4. A cultural characterization of R. solani AG-7 isolates from Arkansas, Indiana, and Japan showed only minor morphological differences between the groups but the Japanese isolates had areolate hyphae to woolly tufts of mycelium after growing for 21 days on potato dextrose agar (PDA). Also, isolates of AG-7 had pitted sclerotial clusters and a brownish exudate after 21 days on PDA whereas isolates of AG-4 did not. These cultural characteristics could be used to separate AG-7 from AG-4 as a preliminary test to determine the need for anastomosis pairing. Radial growth rates were greatest at the cardinal temperatures 30 to 35°C for all isolates, and radial growth rates of the Japanese tester isolates were 1 to 2 cm greater than those of any other cultures of AG-7 or AG-4. Greenhouse and field studies were conducted to determine pathogenicity of R. solani AG-7 on watermelon, cotton (Gossypium hirsutum), and soybean (Glycine max) plants. Results from a greenhouse trial showed the R. solani AG-7 isolates significantly reduced (P ≤ 0.05) stands of cotton and watermelon. Stands of soybean grown in infested and noninfested soil were similar although lesions caused by R. solani AG-7 were consistently found on roots of infested plants. Two field trials were conducted in 1994. Similar significantly different results occurred between the treatments in field trial 1 and in the greenhouse study, but no treatment differences were observed in field trial 2. A confounding factor during field trial 2 was the presence of the pathogen R. solani AG-4, which was isolated from 20% of the plant lesions, compared with 5% in field trial 1. In field trial 3, AG-7 isolates 92.123.B (Arkansas), and 413 1-3F (Indiana) significantly reduced stands of cotton, compared with the noninfested control plots. Isolate RHS 109 (AG-4) was similar to 92.123.B in reducing the cotton plant stand.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
R. solani AG-7 significantly reduced cotton stands in a greenhouse.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- R. solani AG-7 isolatese0
- Interactor
- R. solani AG-7
Rhizoctonia solanie0pathogen - Outcome
- stands of cottone0
- Direction
- reducede0
- Setting
- greenhousee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“R. solani AG-7 isolates significantly reduced (P ≤ 0.05) stands of cotton and watermelon”
e1“greenhouse trial”
Claim · model-written summary
R. solani AG-7 significantly reduced watermelon stands in a greenhouse.
- Taxon
- watermelon
Citrullus lanatuse0 - Treatment
- R. solani AG-7 isolatese0
- Interactor
- R. solani AG-7Rhizoctonia solanie0pathogen
- Outcome
- stands of cotton and watermelone0
- Direction
- reducede0
- Setting
- greenhousee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“R. solani AG-7 isolates significantly reduced (P ≤ 0.05) stands of cotton and watermelon”
e1“greenhouse trial”
Claim · model-written summary
Soybean stands were similar in infested and noninfested soils.
- Taxon
- soybean
Glycine maxe0 - Treatment
- infestede0
- Interactor
- R. solani AG-7Rhizoctonia solanie1pathogen
- Outcome
- Stands of soybeane0
- Direction
- similare0
- Comparator
- noninfested soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stands of soybean grown in infested and noninfested soil were similar”
e1“lesions caused by R. solani AG-7”
Claim · model-written summary
R. solani AG-7 caused root lesions on infested soybean plants.
- Taxon
- soybeanGlycine maxe1
- Organ / stage
- rootse0
- Interactor
- R. solani AG-7Rhizoctonia solanie0pathogen
- Outcome
- lesions caused by R. solani AG-7e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lesions caused by R. solani AG-7 were consistently found on roots of infested plants”
e1“soybean grown in infested and noninfested soil”
Claim · model-written summary
Field trial 1 showed significant treatment differences resembling the greenhouse findings.
- Taxon
- cottonGossypium hirsutume1
- Outcome
- significantly different resultse0
- Setting
- field trial 1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Similar significantly different results occurred between the treatments in field trial 1 and in the greenhouse study”
e1“cotton and watermelon”
Claim · model-written summary
Field trial 2 showed no treatment differences.
- Taxon
- cottonGossypium hirsutume1
- Outcome
- treatment differencese0
- Setting
- field trial 2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no treatment differences were observed in field trial 2”
e1“cotton and watermelon”
Claim · model-written summary
R. solani AG-4 was isolated from 20% of plant lesions in field trial 2.
- Taxon
- cottonGossypium hirsutume1
- Interactor
- R. solani AG-4Rhizoctonia solanie0pathogen
- Outcome
- plant lesionse0
- Value
- 20%e0
- Setting
- field trial 2e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“R. solani AG-4, which was isolated from 20% of the plant lesions, compared with 5% in field trial 1”
e1“cotton and watermelon”
e2“no treatment differences were observed in field trial 2”
Claim · model-written summary
R. solani AG-4 was isolated from 5% of plant lesions in field trial 1.
- Taxon
- cottonGossypium hirsutume1
- Interactor
- R. solani AG-4Rhizoctonia solanie0pathogen
- Outcome
- plant lesionse0
- Value
- 5%e0
- Setting
- field trial 1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“R. solani AG-4, which was isolated from 20% of the plant lesions, compared with 5% in field trial 1”
e1“cotton and watermelon”
Claim · model-written summary
AG-7 isolate 92.123.B significantly reduced cotton stands in field trial 3.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- 92.123.Be0
- Interactor
- R. solani AG-7Rhizoctonia solanie1pathogen
- Outcome
- stands of cottone0
- Direction
- reducede0
- Comparator
- noninfested control plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AG-7 isolates 92.123.B (Arkansas), and 413 1-3F (Indiana) significantly reduced stands of cotton, compared with the noninfested control plots”
e1“Greenhouse and field studies were conducted to determine pathogenicity of R. solani AG-7”
Claim · model-written summary
AG-7 isolate 413 1-3F significantly reduced cotton stands in field trial 3.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- 413 1-3Fe0
- Interactor
- R. solani AG-7Rhizoctonia solanie1pathogen
- Outcome
- stands of cottone0
- Direction
- reducede0
- Comparator
- noninfested control plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AG-7 isolates 92.123.B (Arkansas), and 413 1-3F (Indiana) significantly reduced stands of cotton, compared with the noninfested control plots”
e1“Greenhouse and field studies were conducted to determine pathogenicity of R. solani AG-7”
Claim · model-written summary
AG-4 isolate RHS 109 reduced cotton stands similarly to AG-7 isolate 92.123.B.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- RHS 109e0
- Interactor
- R. solani AG-4Rhizoctonia solanie1pathogen
- Outcome
- cotton plant stande0
- Direction
- reducinge0
- Comparator
- 92.123.Be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Isolate RHS 109 (AG-4) was similar to 92.123.B in reducing the cotton plant stand”
e1“R. solani AG-4”
The same questions in other papers
Rhizoctonia solani · organism · Gossypium hirsutum (cotton)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
infection · Rhizoctonia solani · Glycine max (soybean)Results agree
1 paper in the same direction as this paper
- negative
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.