Amelioration of Tan Spot-Infected Wheat with Nitrogen

Huber, D. M.; Lee, T. S.; Ross, M. A.; Abney, T. S.

doi:10.1094/pd-71-0049

Cited by 21 publications

(13 citation statements)

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“…The increase in leaf spot severity with an increase in N deficiency confirms the findings of others (Huber et al 1987;Orth and Grybauskas 1994); isolation of leaf spot pathogens from lesions on leaves of Ndeficient plants indicates that these were not of a physiological nature as observed by Bockus and Davis (1993). The lower severity of leaf spots with added N is most likely related to a physiological effect by keeping the leaf tissue green for a longer period.…”

Section: Leaf Spots In Crop Rotation Treatmentssupporting

confidence: 85%

“…Further, there have been no studies conducted to determine the effect of fertilizer practices on leaf spot diseases in this region. There are conflicting reports in the literature regarding the effect of N fertilizer on levels of tan spot (Bockus and Davis 1993;Huber et al 1987), whereas an increase in P fertilizer was reported to increase susceptibility to P. nodorum (Cunfer et al 1980;Leath et al 1993).…”

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confidence: 99%

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Effects of crop rotations and fertilizer management on leaf spotting diseases of spring wheat in southwestern Saskatchewan

Fernandez¹,

Zentner²,

McConkey³

et al. 1998

Can. J. Plant Sci.

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. 1998. Effects of crop rotations and fertilizer management on leaf spotting diseases of wheat in southwestern Saskatchewan. Can. J. Plant Sci. 78: [489][490][491][492][493][494][495][496]. 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 Fernandez, M. R., Zentner, R. P., McConkey, B. G. et Campbell, C. A. 1998. Effets des rotations des cultures et de la conduite de la fumure sur l'incidence des taches foliaires chez le blé de printemps dans le sud-ouest de la Saskatchewan. Can. J. Plant Sci. 78: 489-496. L'objet de nos travaux était de déterminer les effets de la séquence culturale, de la fréquence d'insertion de la jachère et de la fumure sur la gravité des taches foliaires dans les cultures de blé de printemps (Triticum aestivum L.). Dans l'expérience, réalisée au champ, Pyrenophora tritici-repentis (Died.) Drechs. était l'agent pathogène le plus couramment mis en évi-dence dans les lésions foliaires, suivi de Phaeosphaeria nodorum (F. Muller) Hedjaroude, la tache des glumes. La gravité des taches foliaires du blé après une jachère était plus forte qu'en culture du blé en continu ou qu'après une culture non céréalière. La proportion de la surface foliaire recouverte par les taches était plus grande dans une deuxième sole successive de blé que dans une sole de blé succédant à une sole de l...

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Section: Leaf Spots In Crop Rotation Treatmentssupporting

confidence: 85%

mentioning

confidence: 99%

Effects of crop rotations and fertilizer management on leaf spotting diseases of spring wheat in southwestern Saskatchewan

Fernandez¹,

Zentner²,

McConkey³

et al. 1998

Can. J. Plant Sci.

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show abstract

“…Plant growth and maintenance requires relatively large amounts of N, and N defi ciency can inhibit growth, decrease photosynthesis (Huber and Thompson, 2007), and reduce tolerance to environmental stress (Orcutt and Nilsen, 2000), potentially increasing susceptibility to stress-related diseases such as anthracnose (Smiley et al, 2005). Specifi c mechanisms associated with reduced anthracnose severity in plants with greater N fertility are currently unknown, although increased plant vigor has been proposed (White et al, 1978;Huber et al, 1987;Krupinsky and Tanaka, 2001). Danneberger et al (1983) found that overstimulating ABG fairway turf with N can enhance disease development; N applied at 292 kg ha -1 yr -1 increased anthracnose foliar blight compared to 146 kg ha -1 yr -1 .…”

Section: Discussionmentioning

confidence: 99%

Anthracnose Severity on Annual Bluegrass Influenced by Nitrogen Fertilization, Growth Regulators, and Verticutting

2008

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Frequency and severity of anthracnose epiphytotics, caused by Colletotrichum cereale Manns Manns sensu lato Crouch, Clarke, and Hillman, on annual bluegrass (ABG) [Poa annua L. f. reptans (Hauskins) T. Koyama] putting greens have increased over the past decade. This 3‐yr field study evaluated the impact of N fertilization (4.9 kg ha−1 every 7 or 28 d), mefluidide (ME; 0 and 0.106 kg a.i. ha−1 yr−1) {N‐[2,4‐dimethyl‐5‐[[(trifluoromethyl)sulfonyl]amino]phenyl]acetamide}, trinexapac‐ethyl (TE; 0 and 0.050 kg a.i. ha−1 every 14 d) [4‐(cyclopropyl‐α‐hydroxy‐methylene)‐3,5‐dioxocyclohexanecarboxylic acid ethylester], verticutting (VC; 0‐ and 3‐mm depth every 14 d), and interactions of these factors on anthracnose of ABG mowed at 3.2 mm. Nitrogen fertilization frequency had the greatest influence on disease throughout the study; N applied at 4.9 kg ha−1 every 7 d reduced damage 5 to 24% compared to a 28‐d interval. The plant growth regulators, ME and TE, frequently interacted during the last 2 yr of the study; sequential application of ME and TE reduced disease 6 to 14% compared to plots that only received one of these plant growth regulators. At advanced stages of disease, the combination of 7‐d N fertilization and ME and TE application had the greatest disease reduction. Verticutting had little effect on anthracnose severity.

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“…Il est egalement recommand e d' eviter les semis produisant une densit e de v eg etation excessive (Hershman & Vincelli, 1997). Enfin, l'augmentation de la fertilisation azot ee et plus particuli erement sous la forme d'ammoniaque, semble r eduire le d eveloppement des l esions provoqu ees par le tan spot (Huber et al, 1987;Krupinsky & Tanaka, 2001). Ceci serait dû a un retardement dans l'apparition de la sensibilit e plutôt qu' a un effet direct sur la maladie (Bockus & Davis, 1993).…”

Section: Lutte Culturaleunclassified

Revue bibliographique: la maladie de la tache auréolée du blé

Benslimane

2015

EPPO Bulletin

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La tache helminthosporienne, maladie du blé, communément désignée par l'appellation anglo‐saxonne « tan spot » est mondialement rencontrée dans les champs de blé, et peut causer d'importantes pertes. Elle est provoquée par un ascomycète Pyrenophora tritici‐repentis, dont les différents isolats semblent très variables sur le plan génétique. Cette maladie est caractérisée par des symptômes typiques, une tache nécrotique entourée d'une chlorose. Huit races de son agent causal sont actuellement reconnues, sur la base des symptômes induits (Chlorose/Nécrose) sur une gamme d'hôtes différentielle. Ces symptômes sont le résultat d'une interaction spécifique entre la plante‐hôte et au moins trois toxines spécifiques à l'hôte, Ptr ToxA, Ptr ToxB et Ptr ToxC. L'analyse de cette interaction a démontré que celle‐ci apparait comme l'image inversée du modèle du gène pour gène décrit par de Flore. Le présent article est une première revue bibliographique en langue française cernant les grands aspects de cette maladie, son épidémiologie et la diversité de son agent causal.

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Amelioration of Tan Spot-Infected Wheat with Nitrogen

Cited by 21 publications

References 1 publication

Effects of crop rotations and fertilizer management on leaf spotting diseases of spring wheat in southwestern Saskatchewan

Effects of crop rotations and fertilizer management on leaf spotting diseases of spring wheat in southwestern Saskatchewan

Anthracnose Severity on Annual Bluegrass Influenced by Nitrogen Fertilization, Growth Regulators, and Verticutting

Revue bibliographique: la maladie de la tache auréolée du blé

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