Abstract
The objective of this study was to determine the effect of crop sequence, summerfallow frequency, and fertilizer application, on the severity of leaf spotting diseases of spring wheat (Triticum aestivum L.). In the field experiment examined, Pyrenophora tritici-repentis (Died.) Drechs. was the pathogen most commonly isolated from lesioned leaf tissue, followed by stagonospora blotch (Phaeosphaeria nodorum [E. Müller] Hedjaroude). The severity of leaf spots in wheat after fallow was greater than in monoculture continuous wheat, or in wheat after a noncereal crop. Percent area with leaf spots in wheat grown after wheat was higher than in wheat grown after flax (Linum usitatissimum L.) or lentil (Lens culinaris Medikus) in years with high disease pressure (1995 and 1996), but not in 1993 or 1994 when overall disease levels were low. Under soil N-deficient conditions, leaf spot levels increased in years with dry summers (1994 and 1996), whereas a P deficiency decreased leaf spot severity in years that had cool and wet springs (1995 and 1996). A survey of producers' fields confirmed the observations made in the research plots, in particular, wheat after wheat was not more severely diseased than wheat grown in rotation with a noncereal crop. We concluded that the use of fallow, or 1 yr of rotation with a noncereal crop, will not reduce leaf spotting diseases of spring wheat in southwestern Saskatchewan. The best rotation aimed at reducing the levels of disease appeared to be 2 consecutive years of spring wheat, followed by at least 2 yr of a noncereal crop, or by a noncereal crop and summerfallow. Key words: Leaf spot, tan spot, Pyrenophora tritici-repentis, stagonospora blotch, Phaeosphaeria nodorum, septoria blotch, Mycosphaerella graminicola, crop rotation, tillage, fertility
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Claims 10
Claim · model-written summary
Pyrenophora tritici-repentis was the most commonly isolated pathogen from lesioned wheat leaves.
- Taxon
- spring wheat
Triticum aestivumt0 - Interactor
- Pyrenophora tritici-repentis
Pyrenophora tritici-repentise0pathogen - Outcome
- pathogen most commonly isolated from lesioned leaf tissuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pyrenophora tritici-repentis (Died.) Drechs. was the pathogen most commonly isolated from lesioned leaf tissue”
t0“spring wheat”
Claim · model-written summary
Phaeosphaeria nodorum followed as a leaf spot pathogen.
- Taxon
- spring wheatTriticum aestivumt0
- Interactor
- Phaeosphaeria nodorum
Parastagonospora nodorume0pathogen - Outcome
- stagonospora blotche0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“followed by stagonospora blotch (Phaeosphaeria nodorum [E. Müller] Hedjaroude)”
t0“spring wheat”
Claim · model-written summary
Wheat after fallow had greater leaf spot severity than continuous wheat or wheat after a noncereal crop.
- Taxon
- wheatTriticum aestivume0
- Treatment
- after fallowe0
- Outcome
- severity of leaf spotse0
- Direction
- greatere0
- Comparator
- monoculture continuous wheat, or in wheat after a noncereal crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The severity of leaf spots in wheat after fallow was greater than in monoculture continuous wheat, or in wheat after a noncereal crop.”
Claim · model-written summary
After wheat, leaf spot area was higher than after flax in high disease pressure years.
- Taxon
- wheatTriticum aestivume0
- Treatment
- grown after wheate0
- Outcome
- Percent area with leaf spotse0
- Direction
- highere0
- Qualifier
- 1995 and 1996e0
- Comparator
- grown after flaxe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Percent area with leaf spots in wheat grown after wheat was higher than in wheat grown after flax (Linum usitatissimum L.) or lentil (Lens culinaris Medikus) in years with high disease pressure (1995 and 1996)”
Claim · model-written summary
After wheat, leaf spot area was higher than after lentil in high disease pressure years.
- Taxon
- wheatTriticum aestivume0
- Treatment
- grown after wheate0
- Outcome
- Percent area with leaf spotse0
- Direction
- highere0
- Qualifier
- 1995 and 1996e0
- Comparator
- lentile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Percent area with leaf spots in wheat grown after wheat was higher than in wheat grown after flax (Linum usitatissimum L.) or lentil (Lens culinaris Medikus) in years with high disease pressure (1995 and 1996)”
Claim · model-written summary
Under N deficiency, leaf spot levels increased in dry summers.
- Taxon
- spring wheatTriticum aestivumt0
- Outcome
- leaf spot levelse0
- Direction
- increasede0
- Qualifier
- soil N-deficient conditionse0
- Setting
- dry summerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under soil N-deficient conditions, leaf spot levels increased in years with dry summers (1994 and 1996)”
t0“spring wheat”
Claim · model-written summary
P deficiency decreased leaf spot severity in cool wet springs.
- Taxon
- spring wheatTriticum aestivumt0
- Outcome
- leaf spot severitye0
- Direction
- decreasede0
- Qualifier
- P deficiencye0
- Setting
- cool and wet springse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a P deficiency decreased leaf spot severity in years that had cool and wet springs (1995 and 1996)”
t0“spring wheat”
Claim · model-written summary
A producer field survey confirmed that wheat after wheat was not more diseased than wheat after a noncereal crop.
- Taxon
- wheatTriticum aestivume0
- Outcome
- severely diseasede0
- Direction
- not moree0
- Comparator
- wheat grown in rotation with a noncereal crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat after wheat was not more severely diseased than wheat grown in rotation with a noncereal crop”
Claim · model-written summary
Authors concluded fallow or one year with a noncereal crop will not reduce spring wheat leaf spotting.
- Taxon
- spring wheatTriticum aestivume0
- Outcome
- will not reduce leaf spotting diseasese0
- Setting
- southwestern Saskatchewane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the use of fallow, or 1 yr of rotation with a noncereal crop, will not reduce leaf spotting diseases of spring wheat in southwestern Saskatchewan”
Claim · model-written summary
The preferred rotation for disease reduction was two wheat years followed by at least two noncereal years or a noncereal year and fallow.
- Taxon
- spring wheatTriticum aestivume0
- Outcome
- 2 consecutive years of spring wheat, followed by at least 2 yr of a noncereal crop, or by a noncereal crop and summerfallowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The best rotation aimed at reducing the levels of disease appeared to be 2 consecutive years of spring wheat, followed by at least 2 yr of a noncereal crop, or by a noncereal crop and summerfallow.”
The same questions in other papers
rotation · disease · Triticum aestivum (wheat)Positive and negative results
17 papers in the same direction as this paper · 20 in the opposite direction
- positive
- no effect
- positive
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.