Abstract
The effects of different plant protection treatments on foliar infestation by Phytophthora infestans and on tuber yield were tested in field trials from 1999 to 2001 under organic farming conditions. Foliar treatments with plant extracts of Potentilla erecta, Salvia officinalis, seaweed extracts, potassium oleate, some other plant vigorisers and combinations with an adjuvant as well as copper hydroxide resulted in different Area Under Crop Health Curves and tuber yield increase. Experiments were conducted at an ecologically-managed farm in the North of Germany (near Hamburg) on a sandy soil or loamy sand (pH 5.2 – 5.7) with the possibility of sprinkler irrigation. In all field trials copper hydroxide showed the lowest AUCHC and the highest yield (+17.7-25.9 %) compared to the control. According to the application of plant extracts there was no significant effect on late blight infestation of leaves and the yield increase of up to 15 % was not significant. Also the seaweed extracts and the other plant vigorisers showed no significant effect on the AUCHC and the tuber yield. At the moment there is no effective alternative for the use of copper to reduce late blight infestation in organic potato production.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher.
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 7
Claim · model-written summary
Copper hydroxide produced the lowest crop health curve measure in all trials.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- copper hydroxidee0
- Interactor
- Phytophthora infestans
Phytophthora infestanst1pathogent0 - Outcome
- AUCHCe0
- Direction
- loweste0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all field trials copper hydroxide showed the lowest AUCHC and the highest yield (+17.7-25.9 %) compared to the control”
t0“potato production”
t1“late blight (Phytophthora infestans) in organic potato production”
Claim · model-written summary
Copper hydroxide increased potato yield by 17.7–25.9% versus control.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- copper hydroxidee0
- Outcome
- yielde0
- Direction
- higheste0
- Value
- +17.7-25.9 %e0
- Comparator
- the controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all field trials copper hydroxide showed the lowest AUCHC and the highest yield (+17.7-25.9 %) compared to the control”
t0“potato production”
Claim · model-written summary
Plant extracts had no significant effect on leaf late blight infestation.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- plant extractse0
- Interactor
- Phytophthora infestansPhytophthora infestanst0pathogen
- Outcome
- late blight infestation of leavese0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant extracts there was no significant effect on late blight infestation of leaves”
t0“late blight (Phytophthora infestans) in organic potato production”
Claim · model-written summary
Plant extract yield gains up to 15% were not significant.
- Taxon
- potatoSolanum tuberosumt1
- Treatment
- plant extractst0
- Outcome
- yield increasee0
- Direction
- increasee0
- Value
- up to 15 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield increase of up to 15 % was not significant”
t0“plant extracts of Potentilla erecta”
t1“potato production”
Claim · model-written summary
Seaweed extracts had no significant effect on crop health curves or tuber yield.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- seaweed extractse0
- Outcome
- AUCHC and the tuber yielde0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seaweed extracts and the other plant vigorisers showed no significant effect on the AUCHC and the tuber yield”
t0“potato production”
Claim · model-written summary
Other plant vigorisers had no significant effect on crop health curves or tuber yield.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- other plant vigoriserse0
- Outcome
- AUCHC and the tuber yielde0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seaweed extracts and the other plant vigorisers showed no significant effect on the AUCHC and the tuber yield”
t0“potato production”
Claim · model-written summary
The authors found no effective alternative to copper for reducing organic potato late blight.
- Taxon
- potatoSolanum tuberosume0
- Outcome
- use of copper to reduce late blight infestatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there is no effective alternative for the use of copper to reduce late blight infestation in organic potato production”
The same questions in other papers
other · yield · Solanum tuberosum (potato)Results differ
4 papers in the same direction as this paper · 73 in the opposite direction
- positive
- positive
- positive
74 papers more in this group
See all 78 papers →botanical · Phytophthora infestans · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 16 in the opposite direction
- positive
- positive
- positive
14 papers more in this group
See all 18 papers →botanical · yield · Solanum tuberosum (potato)Positive and negative results
34 papers in the same direction as this paper · 4 in the opposite direction
- negative
- negative
- no effect
35 papers more in this group
See all 39 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.