Influence of rate of soil fertilization on alternaria leaf blight (Alternaria dauci) in carrots

Vintal, H.; Ben-Noon, E.; Shlevin, E.; Yermiyahu, Uri; Shtienberg, D.; Dinoor, A.

doi:10.1007/bf02981458

Cited by 23 publications

(25 citation statements)

References 9 publications

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“…Previous studies have also found that N nutrition slows the development of early blight on potatoes. Similar relationships between N‐fertilizer and disease development have been reported for A. dauci and A. alternata in carrots and potatoes, respectively . This suggests that diseases caused by species in the Alternaria genus are favoured by low levels of N in the plant.…”

Section: Discussionsupporting

confidence: 74%

The influence of timing the application of nitrogen fertilizer on early blight (Alternaria solani)

Abuley

Nielsen

Hansen

2018

Pest Management Science

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BACKGROUND Field experiments were carried out in 2016 and 2017 to study the influence of timing the application of nitrogen fertilizer (N‐fertilizer) on the susceptibility of potatoes to early blight. We hypothesized that potatoes that receive N‐fertilizer as split applications or a one‐time application at emergence will have a higher N content and be less susceptible to early blight than those that receive N‐fertilizer as a one‐time application before planting. N‐fertilizer was applied either as a one‐time application before planting or at emergence and as split applications. RESULTS Potatoes that did not receive N‐fertilizer were more susceptible to early blight [high area under the disease progress curve (AUDPC)] than those that did receive N‐fertilizer (low AUDPC). The timing of N‐fertilizer application had a significant effect on the susceptibility of potatoes to early blight. Potatoes that received the entire quantity of N‐fertilizer at emergence or as split applications had higher N contents and were less susceptible to early blight than those that received the entire quantity of N‐fertilizer before planting. Potatoes that did not receive N‐fertilizer had a markedly lower starch yield than potatoes that received N‐fertilizer. Potatoes that received the entire quantity of N‐fertilizer before planting had a lower starch yield than potatoes that received the entire quantity of N‐fertilizer at emergence or as split applications. CONCLUSION N‐fertilizer applied as a one‐time application at emergence or as a split application was the best treatment to ensure both high N content and lower attack of early blight, which confirms our hypothesis. © 2018 Society of Chemical Industry

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Section: Discussionsupporting

confidence: 74%

The influence of timing the application of nitrogen fertilizer on early blight (Alternaria solani)

Abuley

Nielsen

Hansen

2018

Pest Management Science

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“…One of the main difficulties of such breeding is the identification of resistant genotypes. Field screening is the routine procedure (Boiteux et al ., 1993; Vintal et al ., 1999; Santos et al ., 2000; Ben‐Noon et al ., 2001; Pryor et al ., 2002), but is time‐consuming, expensive and highly affected by uncontrollable environmental conditions and the simultaneous presence of other pathogens. Moreover, field conditions unfavourable to A. dauci development often result in substantial material waste.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of carrot resistance to alternaria leaf blight in controlled environments

Pawelec¹,

Dubourg²,

Briard³

2006

Plant Pathology

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The objective of this study was to find a technique for plant resistance screening to alternaria leaf blight (ALB), caused by the fungus Alternaria dauci , in controlled environments. Glasshouse and laboratory screening methods were compared using three cultivars and F 2 genotypes segregating for ALB resistance evaluated against self-pollinated F 3 fieldgrown plants. Plant disease was assessed through a disease index obtained from the size and number of symptoms on carrot leaves. The results indicated the value of glasshouse evaluation and the inadequacy of detached leaf and hypocotyl assays for carrot screening for ALB resistance. Spearman's rank correlation, applied to results obtained with both F 2 plants and their progeny, indicated that the optimal evaluation stage for ALB resistance in carrot is 20 days after inoculation. This test was powerful enough to be used as a prescreening test in breeding programmes.

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“…In Israel (Vintal et al 1999) and Florida (White et al 1983), severity of ALB is decreased with increasing applications of N, P, and K fertilizers. The severity of both diseases decrease as N application rates increase in Michigan (Warncke 1996) and Ontario (Westerveld et al 2002;Westerveld 2005).…”

Section: Nitrogen Interactions With Alternariamentioning

confidence: 99%

“…Nitrogen application appears to delay leaf senescence, thereby decreasing ALB infection (Vintal et al 1999;Westerveld 2005), as A. dauci infects older, senescent leaves (Soteros 1979). Nitrogen application could also increase production of new leaves, thereby decreasing the effect of these diseases on overall health of the crop (Westerveld 2005).…”

Section: Nitrogen Interactions With Alternariamentioning

confidence: 99%

Nitrogen utilization timeline of carrot over the growing season

Westerveld¹,

McDonald²,

McKeown³

2007

Can. J. Plant Sci.

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Westerveld, S. M., McDonald, M. R. and McKeown, A. W. 2007. Nitrogen utilization timeline of carrot over the growing season. Can. J. Plant. Sci. 87: 587-592. A timeline of nitrogen (N) dynamics of the carrot crop was developed based on studies on the effects of N application on carrot growth, N uptake and partitioning, and interactions with Alternaria [ALB; A. dauci (Kühn) Groves and Skolko] and Cercospora [CLB; C. carotae (Pass.) Solheim] leaf blight. Preplant-applied fertilizer N affects yield only when residual N in the top 60 cm of the soil profile is insufficient. The majority of the N required by the crop is taken up beyond 50 d after seeding (DAS). Carrots have a root system that extends to 150-cm depth and >50% of the fibrous root system occurs below 30-cm depth. It is likely that N below 30 cm depth is required beyond 50 DAS, since the majority of the fibrous roots are below 30 cm depth after that stage. There is insufficient time for sidedressed N to leach into the active root system beyond 50 DAS, unless its application is timed before irrigation or rain events. Regardless of the amount of residual N, preplant-applied N is essential for minimizing leaf blight severity. It is possible that leaf blight defences are conferred upon leaf emergence and may benefit from abundant N at this time. A preplant soil nitrate-N test from both the top 30 cm and the 30-to 60-cm depth could be useful for determining residual N levels and for adjusting N fertilizer application rates accordingly. . L'application d'engrais N avant la plantation n'affecte le rendement que lorsque la concentration de N résiduel dans les premiers 60 cm de sol est insuffisante. La majeure partie du N dont la culture a besoin est absorbé plus de 50 jours après les semis. Le système racinaire de la carotte s'enfonce jusqu'à 150 cm de profondeur et au-delà de la moitié des racines fibreuses se trouvent à plus de 30 cm dans le sol. Passé le 50 e jour suivant les semis, il est donc probable que la plante aille chercher le N qu'il lui faut à une profondeur supérieure à 30 cm. À cette date, le temps manque pour que le N épandu en bandes latérales parvienne jusqu'aux racines actives, à moins que l'engrais soit appliqué avant l'irrigation ou des précipitations. Peu importe la quantité de N résiduel, il est essentiel d'appliquer un engrais azoté avant les semis si l'on veut minimiser la gravité de la brûlure des feuilles. En effet, il se peut que la plante acquière ses moyens de défense contre la maladie à l'apparition des feuilles. Elle pourrait donc bénéficier d'une abondance de N à ce moment. Doser les nitrates dans la couche supérieure de 30 cm du sol et entre 30 et 60 cm de profondeur avant la plantation pourrait aider à établir la concentration de N résiduel et le taux d'application des engrais azotés nécessaire pour rectifier la situation. Solheim] leaf blight severity, depth and distribution of roots, and N uptake and partitioning by carrots over the season. The purpose of this review article is to summarize the research on N effects on carrots...

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Influence of rate of soil fertilization on alternaria leaf blight (Alternaria dauci) in carrots

Cited by 23 publications

References 9 publications

The influence of timing the application of nitrogen fertilizer on early blight (Alternaria solani)

The influence of timing the application of nitrogen fertilizer on early blight (Alternaria solani)

Evaluation of carrot resistance to alternaria leaf blight in controlled environments

Nitrogen utilization timeline of carrot over the growing season

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