Potato Late-Blight Management in the Toluca Valley: Forecasts and Resistant Cultivars

Grünwald, Niklaus J.; Rubio-Covarrubias, Oswaldo Ángel; Fry, William E.

doi:10.1094/pdis.2000.84.4.410

Cited by 55 publications

(39 citation statements)

References 16 publications

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“…Many reports show that partial resistance in the foliage may be used to complement fungicide applications to allow savings of fungicide by reduced application rates or extended intervals between applications (Bain et al 2008;Bradshaw and Bain 2007;Bus et al 1995;Clayton and Shattock 1995;Fry 1975Fry , 1977Fry , 1978Fry et al 1983;Gans et al 1995;Grünwald et al 2000;Nielsen and Bødker 2001;Nielsen 2004;Naerstad et al 2007a;Shtienberg et al 1994). Naerstad et al (2007a) showed that exploiting high foliage resistance to reduce fungicide input was risky when field resistance to tuber blight was low.…”

Section: Use Of Resistant Cultivarsmentioning

confidence: 99%

Epidemiology and Integrated Control of Potato Late Blight in Europe

et al. 2011

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Phytophthora infestans, the causal agent of late blight, is a major threat to potato production in northwestern Europe. Before 1980, the worldwide population of P. infestans outside Mexico appeared to be asexual and to consist of a single clonal lineage of A1 mating type characterized by a single genotype. It is widely believed that new strains migrated into Europe in 1976 and that this led to subsequent population changes including the introduction of the A2 mating type. The population characteristics of recently collected isolates in NW Europe show a diverse population including both mating types, sexual reproduction and oospores, although differences are observed between regions. Although it is difficult to find direct evidence that new strains are more aggressive, there are several indications from experiments and field epidemics that the aggressiveness of P. infestans has increased in the past 20 years. The relative importance of the different primary inoculum sources and specific measures for reducing their role, such as covering dumps with plastic and preventing seed tubers from becoming infected, is described for the different regions. In NW Europe, varieties with greater resistance tend not to be grown on a large scale. From the grower's perspective, the savings in fungicide input that can be achieved with these varieties are not compensated by the higher (perceived) risk of blight. Fungicides play a crucial role in the integrated control of late blight. The spray strategies in NW Europe and a table of the specific attributes of the most important fungicides in Europe are presented. The development and use of decision support systems (DSSs) in NW Europe are described. In The Netherlands, it is estimated that almost 40% of potato growers use recommendations based on commercially available DSS. In the Nordic countries, a new DSS concept with a fixed 7-day spray interval and a variable dose rate is being tested. In the UK, commercially available DSSs are used for c. 8% of the area. The validity of Smith Periods for the new population of P. infestans in the UK is currently being evaluated.

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Section: Use Of Resistant Cultivarsmentioning

confidence: 99%

Epidemiology and Integrated Control of Potato Late Blight in Europe

et al. 2011

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“…Na primavera, foram cinco aplicações, sendo o número dessas, no modelo "Prophy", maior do que no modelo "Blitecast" devido a coleta das informações meteorológicas ser mais próxima das plantas (TRENTIN, O aumento da doença, associado às condições meteorológicas favoráveis, observadas a partir dos 45 DAE, nos dois experimentos, coincidiu com o período de crescimento dos tubérculos, quando a planta é mais suscetível à doença (GRÜNWALD et al, 2000). Na primavera o número de pulverizações nos tratamentos baseados no modelo de previsão "Blitecast" foi sempre menor do que 31% das aplicações semanais, enquanto que, no modelo "Prophy", foi menor do que 51% (Tabela 2).…”

Section: Resultsunclassified

Controle da requeima em batata cv. 'Asterix' como base para modelos de previsão da doença

et al. 2009

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“…Spray treatments were applied maximally one day before the actual start of the critical period. SIMCAST's (Grunwald et al, 2000(Grunwald et al, , 2002 fungicide units (FU's) were used to determine the remaining level of fungicide protection. Blightdays as described by Skelsey et al, (2009) were used to determine critical days, days with sufficiently long periods of leaf wetness to support infection.…”

Section: Methodsmentioning

confidence: 99%

Regional spore dispersal as a factor in disease risk warnings for potato late blight: A proof of concept

Skelsey¹,

Kessel²,

Holtslag³

et al. 2009

Agricultural and Forest Meteorology

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SUMMARYThis study develops and tests novel approaches that significantly reduce the fungicide input necessary for potato late blight control while maintaining the required high level of disease control. The central premise is that fungicide inputs can be reduced by reducing dose rates on more resistant cultivars, by omitting applications on days when conditions are unsuitable for atmospheric transport of viable sporangia and by adapting the dose rate to the length of the predicted critical period. These concepts were implemented and tested in field experiments in 2007 and 2008 in the North Eastern potato growing region in the Netherlands which is known for its high potato late blight disease pressure. Field experiments contained three starch potato cultivars, representing a range in resistance to potato late blight from susceptible to highly resistant, and a series of decision rules determining spray timing and incorporating an increasing number of variables such as: remaining fungicide protection level, critical weather, atmospheric capacity for viable transport of sporangia and the length of the predicted critical period. The level of cultivar resistance was used to reduce the dose rate of the preventive fungicide Shirlan (a.i. fluazinam) by default. A 50% -75% reduction of the fungicide input proved possible in both years without adverse consequences to the crop or yield. The principles can be used in many decision contexts, but further work is needed to test and refine the methods before it can be used in practice.

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Potato Late-Blight Management in the Toluca Valley: Forecasts and Resistant Cultivars

Cited by 55 publications

References 16 publications

Epidemiology and Integrated Control of Potato Late Blight in Europe

Epidemiology and Integrated Control of Potato Late Blight in Europe

Controle da requeima em batata cv. 'Asterix' como base para modelos de previsão da doença

Regional spore dispersal as a factor in disease risk warnings for potato late blight: A proof of concept

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