Abstract
Potato yields are significantly impacted by soilborne diseases such as the root-lesion nematode, Pratylenchus penetrans. Traditional management strategies involve soil fumigation with broad-spectrum pesticides, such as metam sodium, and postplanting applications of nonfumigant nematicides, including oxamyl and fluopyram. In Michigan, approximately 35% of potato hectares are treated with metam sodium, and 50 to 60% of potato hectares are amended with customized manure-based composts. Considering the critical impact of this nematode on the potato industry, along with potential future restrictions on chemical use due to environmental concerns and the growing adoption of organic soil amendments by Michigan potato growers, it is essential to validate manure-based amendments as an alternative management strategy for P. penetrans. To explore this, two field trials were conducted in 2020 and 2021 to assess the impact of manure-based amendments, biological control agents, oxamyl, and their combinations on P. penetrans. This study found that applying raw poultry manure at a rate of 3.08 tons ha −1 , either alone or combined with a single application of oxamyl at 2.5 liters ha −1 , effectively maintained low P. penetrans populations in both soil and roots. Additionally, Compost A and poultry manure increased potato yields. Moreover, the combined application of manure-based amendments and Purpureocillium lilacinum (MeloCon) showed varying efficacy depending on the amendment used. Our studies provide the necessary evidence that validates the efficacy of these management practices to reduce P. penetrans populations and to enhance potato yields. [Formula: see text] Copyright © 2025 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license .
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Claims 5
Claim · model-written summary
Poultry manure maintained low nematode populations in soil and roots.
- Taxon
- Potato
Solanum tuberosumt0 - Treatment
- raw poultry manure at a rate of 3.08 tons ha −1e0
- Interactor
- P. penetrans
Pratylenchus penetranse0pathogen - Outcome
- P. penetrans populations in both soil and rootse0
- Direction
- lowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying raw poultry manure at a rate of 3.08 tons ha −1 , either alone or combined with a single application of oxamyl at 2.5 liters ha −1 , effectively maintained low P. penetrans populations in both soil and roots”
t0“Potato”
Claim · model-written summary
Poultry manure with oxamyl maintained low nematode populations.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- raw poultry manure at a rate of 3.08 tons ha −1 , either alone or combined with a single application of oxamyl at 2.5 liters ha −1e0
- Interactor
- P. penetransPratylenchus penetranse0pathogen
- Outcome
- P. penetrans populations in both soil and rootse0
- Direction
- lowe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying raw poultry manure at a rate of 3.08 tons ha −1 , either alone or combined with a single application of oxamyl at 2.5 liters ha −1 , effectively maintained low P. penetrans populations in both soil and roots”
t0“Potato”
Claim · model-written summary
Compost A increased potato yield.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- Compost Ae0
- Outcome
- potato yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compost A and poultry manure increased potato yields”
Claim · model-written summary
Poultry manure increased potato yield.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- poultry manuree0
- Outcome
- potato yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compost A and poultry manure increased potato yields”
Claim · model-written summary
Efficacy of manure amendments with Purpureocillium lilacinum varied by amendment.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- combined application of manure-based amendments and Purpureocillium lilacinum (MeloCon)e0
- Interactor
- P. penetransPratylenchus penetranse1pathogen
- Second interactor
- Purpureocillium lilacinum
Purpureocillium lilacinume0biocontrol_agent - Outcome
- varying efficacye0
- Qualifier
- depending on the amendment usede0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“combined application of manure-based amendments and Purpureocillium lilacinum (MeloCon) showed varying efficacy depending on the amendment used”
t0“Potato”
e1“impact of manure-based amendments, biological control agents, oxamyl, and their combinations on P. penetrans”
The same questions in other papers
oxamyl · Pratylenchus penetrans · Solanum tuberosum (potato)Results agree
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- positive
- positive
- positive
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1 in the opposite direction
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fertilization · yield · Solanum tuberosum (potato)Positive and negative results
393 papers in the same direction as this paper · 48 in the opposite direction · 8 reporting no difference from an alternative
- positive
- positive
- negative
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See all 450 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.