Abstract
Crop sequence is an important management practice that may lower the risk for leaf spot diseases of spring wheat ( Triticum aestivum L.). Field research was conducted near Mandan, ND, to determine the impact of crop sequences on leaf spot diseases of hard red spring wheat early in the growing season. Spring wheat was evaluated for disease severity following crop sequence combinations of 10 crops [buckwheat ( Fagopyrum esculentum Moench), canola ( Brassica napus L.), chickpea ( Cicer arietinum L.), corn ( Zea mays L.), dry pea ( Pisum sativum L.), grain sorghum [ Sorghum bicolor (L.) Moench], lentil ( Lens culinaris Medik.), oil seed sunflower ( Helianthus annuus L.), proso millet ( Panicum miliaceum L.), and hard red spring wheat). Spring wheat leaves with distinct lesions were collected for determination of lesion number and percentage necrosis data, which were used to estimate leaf spot disease severity. Pyrenophora tritici‐repentis (Died.) Drechs., the cause of tan spot, and Phaeosphaeria nodorum (E. Müller) Hedjaroude, the cause of Stagonospora nodorum blotch, were the major leaf spot diseases and consistently present throughout the growing season. The frequency of isolation following alternative crops was generally lower compared with spring wheat following wheat. Leaf spot diseases on spring wheat were impacted by crop sequencing. Spring wheat following crop sequences with alternative crops for 1 or 2 yr had lower levels of disease severity compared with a continuous spring wheat treatment early in the growing season. Disease severity was apparently not related to the percentage of crop residue coverage on the soil surface associated with various crop sequence combinations. New alternative crops preceding spring wheat reduce levels of leaf spot diseases.
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Claims 5
Claim · model-written summary
Tan spot and Stagonospora nodorum blotch were consistently present as major leaf spot diseases.
- Taxon
- spring wheat
Triticum aestivumt0 - Interactor
- Pyrenophora tritici‐repentise0pathogen
- Outcome
- tan spote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pyrenophora tritici‐repentis (Died.) Drechs., the cause of tan spot, and Phaeosphaeria nodorum (E. Müller) Hedjaroude, the cause of Stagonospora nodorum blotch, were the major leaf spot diseases and consistently present throughout the growing season”
t0“Spring Wheat”
Claim · model-written summary
Stagonospora nodorum blotch was consistently present as a major leaf spot disease.
- Taxon
- spring wheatTriticum aestivumt0
- Interactor
- Phaeosphaeria nodorum
Parastagonospora nodorume0pathogen - Outcome
- Stagonospora nodorum blotche0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phaeosphaeria nodorum (E. Müller) Hedjaroude, the cause of Stagonospora nodorum blotch, were the major leaf spot diseases and consistently present throughout the growing season”
t0“Spring Wheat”
Claim · model-written summary
Pathogen isolation frequency was generally lower after alternative crops than after wheat.
- Taxon
- spring wheatTriticum aestivume0
- Treatment
- following alternative cropse0
- Outcome
- frequency of isolatione0
- Direction
- lowere0
- Comparator
- spring wheat following wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The frequency of isolation following alternative crops was generally lower compared with spring wheat following wheat”
Claim · model-written summary
One or two years of alternative crops reduced early-season spring wheat disease severity relative to continuous wheat.
- Taxon
- Spring wheatTriticum aestivume0
- Treatment
- crop sequences with alternative crops for 1 or 2 yre0
- Outcome
- disease severitye0
- Direction
- lowere0
- Qualifier
- early in the growing seasone0
- Comparator
- a continuous spring wheat treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spring wheat following crop sequences with alternative crops for 1 or 2 yr had lower levels of disease severity compared with a continuous spring wheat treatment early in the growing season”
Claim · model-written summary
Disease severity was apparently unrelated to surface crop residue coverage.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- crop residue coveragee0
- Outcome
- Disease severitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease severity was apparently not related to the percentage of crop residue coverage on the soil surface”
t0“Spring Wheat”
The same questions in other papers
rotation · disease · Triticum aestivum (wheat)Positive and negative results
19 papers in the same direction as this paper · 17 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- no effect
34 papers more in this group
See all 38 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.