Abstract
Summary and Conclusions The present communication summarises the first results of work now being carried out at the College farm, Aber, Bangor. It is to be regarded as a first progress report. Quanjer's statement as to communicability of leaf‐roll by grafting tubers is confirmed. The unlikelihood that ‘seed’ sterilisation will be useful as a measure of control is indicated by the failure to effect any control by steeping infected ‘seed’ in 1/1000 mercuric chloride for an hour and a quarter. Cutting diseased tubers before planting did not affect the yield. The loss in yield due to leaf‐roll was 55.8 per cent. in 1921, 45.6 per cent, in 1922 and 52.6 per cent, in 1923. The effects of leaf‐roll do not appear to be cumulative under the conditions at Bangor. The proportion of seed‐size and small tubers—as determined by relative weights and numbers—to total crop was not increased in the variety Arran Comrade as a result of infection with leaf‐roll. The reduction in total number of tubers produced by a leaf‐roll crop was = 54.4 per cent, in 1922 and 61 per cent, in 1923. The transference of leaf‐roll to healthy plants at Bangor in 1921 and 1922 has been studied. Evidence of soil transmission in 1921 is submitted. In 1922 both aerial and soil transmission is believed to have taken place. Maximum infection in 1921 did not affect the yield in that year. The relation of leaf‐roll to seed‐potato production is discussed.
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Claims 13
Claim · model-written summary
Leaf-roll was communicable by grafting tubers.
- Taxon
- POTATO
Solanum tuberosumt0 - Outcome
- communicability of leaf‐roll by grafting tuberse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“POTATO”
e0“Quanjer's statement as to communicability of leaf‐roll by grafting tubers is confirmed.”
Claim · model-written summary
Steeping infected seed in mercuric chloride failed to control leaf-roll.
- Taxon
- POTATOSolanum tuberosumt0
- Treatment
- steeping infected ‘seed’ in 1/1000 mercuric chloride for an hour and a quartere0
- Outcome
- controle0
- Direction
- failure to effect any controle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“POTATO”
e0“failure to effect any control by steeping infected ‘seed’ in 1/1000 mercuric chloride for an hour and a quarter”
Claim · model-written summary
Cutting diseased tubers before planting did not affect yield.
- Taxon
- POTATOSolanum tuberosumt0
- Treatment
- Cutting diseased tubers before plantinge0
- Outcome
- yielde0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“POTATO”
e0“Cutting diseased tubers before planting did not affect the yield.”
Claim · model-written summary
Leaf-roll reduced yield by 55.8 per cent in 1921.
- Taxon
- POTATOSolanum tuberosumt0
- Treatment
- leaf‐rolle0
- Outcome
- yielde0
- Direction
- losse0
- Value
- 55.8 per cent.e0
- Qualifier
- in 1921e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“POTATO”
e0“The loss in yield due to leaf‐roll was 55.8 per cent. in 1921”
Claim · model-written summary
Leaf-roll reduced yield by 45.6 per cent in 1922.
- Taxon
- POTATOSolanum tuberosumt0
- Treatment
- leaf‐rolle0
- Outcome
- yielde0
- Direction
- losse0
- Value
- 45.6 per cente0
- Qualifier
- in 1922e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“POTATO”
e0“The loss in yield due to leaf‐roll was 55.8 per cent. in 1921, 45.6 per cent, in 1922”
Claim · model-written summary
Leaf-roll reduced yield by 52.6 per cent in 1923.
- Taxon
- POTATOSolanum tuberosumt0
- Treatment
- leaf‐rolle0
- Outcome
- yielde0
- Direction
- losse0
- Value
- 52.6 per cente0
- Qualifier
- in 1923e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“POTATO”
e0“The loss in yield due to leaf‐roll was 55.8 per cent. in 1921, 45.6 per cent, in 1922 and 52.6 per cent, in 1923”
Claim · model-written summary
Leaf-roll effects did not appear cumulative at Bangor.
- Taxon
- POTATOSolanum tuberosumt0
- Outcome
- effects of leaf‐rolle0
- Direction
- do not appear to be cumulativee0
- Setting
- Bangore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“POTATO”
e0“The effects of leaf‐roll do not appear to be cumulative under the conditions at Bangor.”
Claim · model-written summary
Leaf-roll did not increase the proportion of seed-size and small tubers in Arran Comrade.
- Taxon
- POTATOSolanum tuberosumt0
- Material
- Arran Comradee0
- Treatment
- infection with leaf‐rolle0
- Outcome
- proportion of seed‐size and small tuberse0
- Direction
- not increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“POTATO”
e0“The proportion of seed‐size and small tubers—as determined by relative weights and numbers—to total crop was not increased in the variety Arran Comrade as a result of infection with leaf‐roll.”
Claim · model-written summary
Leaf-roll reduced tuber number by 54.4 per cent in 1922.
- Taxon
- POTATOSolanum tuberosumt0
- Treatment
- leaf‐rolle0
- Outcome
- total number of tuberse0
- Direction
- reductione0
- Value
- 54.4 per cente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“POTATO”
e0“The reduction in total number of tubers produced by a leaf‐roll crop was = 54.4 per cent, in 1922”
Claim · model-written summary
Leaf-roll reduced tuber number by 61 per cent in 1923.
- Taxon
- POTATOSolanum tuberosumt0
- Treatment
- leaf‐rolle0
- Outcome
- total number of tuberse0
- Direction
- reductione0
- Value
- 61 per cente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“POTATO”
e0“The reduction in total number of tubers produced by a leaf‐roll crop was = 54.4 per cent, in 1922 and 61 per cent, in 1923”
Claim · model-written summary
Evidence of soil transmission of leaf-roll was found in 1921.
- Taxon
- POTATOSolanum tuberosumt0
- Outcome
- soil transmissione0
- Qualifier
- in 1921e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“POTATO”
e0“Evidence of soil transmission in 1921 is submitted.”
Claim · model-written summary
Aerial and soil transmission of leaf-roll was believed to occur in 1922.
- Taxon
- POTATOSolanum tuberosumt0
- Outcome
- aerial and soil transmissione0
- Qualifier
- In 1922e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“POTATO”
e0“In 1922 both aerial and soil transmission is believed to have taken place.”
Claim · model-written summary
Maximum infection in 1921 did not affect yield that year.
- Taxon
- POTATOSolanum tuberosumt0
- Treatment
- Maximum infectione0
- Outcome
- yielde0
- Direction
- did not affecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“POTATO”
e0“Maximum infection in 1921 did not affect the yield in that year.”
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See all 24 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.