Development of Potato Late Blight Epidemics: Disease Foci, Disease Gradients, and Infection Sources

Zwankhuizen, M.J.; Govers, F.; Zadoks, J.C.

doi:10.1094/phyto.1998.88.8.754

Cited by 103 publications

(66 citation statements)

References 23 publications

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“…Santa Catalina and Uvilla at standard and high planting densities. management, this constraint might be removed as regional management of late blight improves; a landscape-scale study examining the role of specific infection sources, such as that of Zwankhuizen et al (24), would help to clarify these interactions.…”

Section: Discussionmentioning

confidence: 99%

The Effects of Host Diversity and Other Management Components on Epidemics of Potato Late Blight in the Humid Highland Tropics

Garrett¹,

Nelson²,

Mundt³

et al. 2001

Phytopathology®

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A field study at three highland sites near Quito, Ecuador, was conducted to determine whether host-diversity effects on potato late blight would be as important as recently found in studies conducted in temperate areas. We compared three potato mixtures and use of mixtures in combination with different planting densities and two fungicide regimes. Treatment comparisons were made by absolute and relative measures of host-diversity effects and incorporating a truncated area under the disease progress curve as a means of standardizing comparisons across sites. Potato-faba intercrops consisting of only 10% potato provided an estimate of the effects of dilution of susceptible host tissue. Host-diversity effects were very different across study sites, with a large host-diversity effect for reduced disease only at the site most distant from commercial potato production. Planting density had little influence on host-diversity effects or on late blight in single-genotype stands. Fungicide use in combination with potato mixtures enhanced a host-diversity effect for reduced late blight. Potato-faba intercrops produced only a small decrease in potato late blight. Effects of host diversity on yield were variable, with the greatest increase in yield for mixtures treated with fungicides at the site most distant from commercial potato production. The effects of host diversity on late blight severity may be less consistent in the tropical highlands than in the temperate zone, but can contribute to integrated disease management.

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Section: Discussionmentioning

confidence: 99%

The Effects of Host Diversity and Other Management Components on Epidemics of Potato Late Blight in the Humid Highland Tropics

Garrett¹,

Nelson²,

Mundt³

et al. 2001

Phytopathology®

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“…However, there have been particular aspects of organic farming and food that have raised concerns over safety. Namely, recent work shows that organic farms can act as reservoirs of disease (Eltun 1996;Zwankhuizen et al 1998). A consequence of disease problems is the reported higher contamination of organic food by the mycotoxins, patulin (Lovejoy 1994) and fumonisin (Eltun 1996;Schollenberger et al 1999).…”

Section: Organic Food Is Safe?mentioning

confidence: 99%

The myth of organic agriculture

Pacanoski¹

2009

Plant Prot. Sci.

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Although many people are convinced of the superiority of organic agriculture in any form, there are many negative aspects that follow this type of agricultural system. The productivity of organic cropping systems is considerably lower than that of conventional or integrated systems and leads to less land being available for non-agricultural uses such as wildlife habitats, has greater negative impacts on the environment, and reduced sustainability. The absence of synthetic fertilisers or pesticides does not necessarily lead to an ability to produce healthy and safe food in an environmentally sustainable manner.

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“…Frequent use of fungicides is neither economical nor beneficial for the environment and human health. Environmental factors play significant role in the development of the epiphytotics (Zwankhuizen and Zadoks, 1998). For the most efficient and sustainable disease management strategies, epidemiological and biological data were used to develop a model for the management of late blight dynamics (Khan and Khan, 2000).…”

Section: Introductionmentioning

confidence: 99%

Development of Predictive Model Based on Epidemiological Factors for the Management of Potato Late Blight Disease

Ahmed¹,

Khan²,

Khan³

et al. 2016

IJAB

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Potato late blight (PLB) caused by Phytophthora infestans (Mont.) de Bary, is an important and serious threat to successful potato production in the world. It spreads through seed and soil residual material. In Pakistan, PLB disease may cause complete crop failure under severe epidemic conditions. Due to lack of resistance in indigenous potato germplasm, disease is managed through fungicides by the growers of Pakistan. Nonetheless, excessive use of fungicides cause resistance in the pathogen and create fatalistic effect on the environment. Disease predictive model under such situation may be effective tool to predict early onset of disease which is helpful to reduce number of sprays. The data of five susceptible to highly susceptible varieties sown for consecutively ten years were collected from Plant Pathology Section, Ayub Agricultural Research Institute (AARI), Faisalabad. A disease predictive model was developed based on ten years data of PLB severity and epidemiological variables using stepwise regression analysis. The model was validated by regression model based on two years data. The results revealed that the ten years model explained 74%, while two years model explained 80% disease variability. In accordance of variety wise models, SH-5 and Diamont models explained up to 91% and 89% disease variability, respectively during two year. The predictive model was used for the management of PLB disease and only three sprays were applied. Applied sprays reduced the PLB disease severity on all the five varieties (N-22, FD48-4, FD69-1, FSD White and Cardinal) up to 2.46, 6.50, 2.50, 8.46 and 1.67%, respectively. All the treatments significantly reduced the disease severity whereas Phenylamide and Propineb were the most effective as compared to the control. Prediction of disease model would be helpful to apply two or three sprays of fungicides (Phenylamide and Propineb) to control late blight of potato successfully.

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Development of Potato Late Blight Epidemics: Disease Foci, Disease Gradients, and Infection Sources

Cited by 103 publications

References 23 publications

The Effects of Host Diversity and Other Management Components on Epidemics of Potato Late Blight in the Humid Highland Tropics

The Effects of Host Diversity and Other Management Components on Epidemics of Potato Late Blight in the Humid Highland Tropics

The myth of organic agriculture

Development of Predictive Model Based on Epidemiological Factors for the Management of Potato Late Blight Disease

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