Assessment of the impact of mid-season late blight infection on disease development and yield of potato variety Russet Norkotah in Maine

Olanya, O. M.; Lambert, D. H.; Johnson, Steven B.; Dwyer, J. D.

doi:10.1080/09670870110102594

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…Some authors have reported low incidences of tuber blight at harvest in the apparent absence of foliar blight (Lacey 1967b). In other cases, low incidences of tuber blight have been reported after high levels of foliar blight epidemics (Hirst et al 1965;Olanya et al 2002). Similarly, research reports have indicated high levels of tuber infection even in fields where numerous applications of protectant and curative fungicides were applied (Flier et al 1998).…”

Section: Introductionmentioning

confidence: 91%

Effects of Mulch and Potato Hilling on Development of Foliar Blight (Phytophthora infestans) and the Control of Tuber Blight Infection

2008

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Foliar and tuber blight caused by Phytophthora infestans accounts for significant losses in potatoes in field and storage. Nevertheless, limited research has been published on the effects of cultural practices on late blight control. Field experiments were conducted in two years on Howard gravely loam soil in New York State to evaluate the effectiveness of mulching using oat straw and hilling in preventing tuber blight infection for cvs Allegany and Katahdin. Potato hilling and mulching had little effect on foliar blight development. The cultivar affected the disease development in the foliage, with cv. Allegany showing lower foliar late blight than cv. Katahdin. Tuber blight incidence averaged 25% for cv. Allegany and 3% for cv. Katahdin in hilled plots, while in the mulched plots the incidence of tuber blight averaged 33% for cv. Allegany and 10% for cv. Katahdin. The straw hay mulch was ineffective in tuber blight control. Tubers set at a soil depth of more than 7 cm had lower tuber blight incidence than shallow tubers set at a depth of less than 7 cm. In both years, hilling provided partial protection of tubers but its effectiveness was limited in the presence of favourable conditions for late blight development. Even though large hills had proportionally a lower tuber blight incidence than medium-sized hills, the difference between the different hill sizes was not significant. These studies suggest that the use of cultivars with foliage resistance to late blight in combination with cultural practices may partially reduce the incidence of tuber blight.

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Section: Introductionmentioning

confidence: 91%

Effects of Mulch and Potato Hilling on Development of Foliar Blight (Phytophthora infestans) and the Control of Tuber Blight Infection

2008

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“…The study did not explore the cause of vulnerability but speculates that crop from seed tuber have food reserve to support higher crop vigour and established rooting systems which draw nutrients offering inherent capacity to tolerate late blight to a certain degree. Previous study reported that appearance of late blight symptoms in the first 10-12 days after emergence lead to severe epidemics resulting in 80-100% foliage damage (Norkotah, 2002). Norkotah (2002) further observed that late or mid infections result in less severe epidemics and less yield loss as it was observed during short rain season.…”

Section: Estimation Of Yield Increasementioning

confidence: 91%

“…Previous study reported that appearance of late blight symptoms in the first 10-12 days after emergence lead to severe epidemics resulting in 80-100% foliage damage (Norkotah, 2002). Norkotah (2002) further observed that late or mid infections result in less severe epidemics and less yield loss as it was observed during short rain season. T. asperellum at 66% and 100% concentration was able to delay late blight infection while reducing the number fungicide applications by increasing the spray interval by 7 days.…”

Section: Estimation Of Yield Increasementioning

confidence: 91%

Cost Benefit Analyses in Managing Late Blight Through Trichoderma asperellum Seed Treatment and Ridomil® Application on Potato

Jackson¹,

Joseph²,

Wambomba³

et al. 2020

JAS

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Fungicides overuse in management of late blight has led to increased cost of production and biodiversity issues. To better understand costs and benefits associated with seed treatment to reduce fungicide application, apical cutting and tuber seed crop were pre-treated by either peridermal injection or dipping using T. asperellum suspension at 33%, 66% and 100% concentration and then sprayed separately with Ridomil® (Metalaxyl 4% + Mancozeb 64%) at 21, 14 and 7 (Manufacturer’s Recommended Regime) days interval. Results showed that apical cuttings had 7.5% higher disease severity and 0.2% lower yield than crop from seed tuber. Untreated and 33% T. asperellum were not significant different (p = 0.05) in disease and yield scores. T. asperellum concentration at 66% and 100% reduced disease severity by 26% and 27% resulting to 30% and 29% yield increment respectively. Spray interval of 14 days did not differ significantly from 7 day spray interval in terms of disease score and yield but the regime MRR% was double 7 day spray interval. Maximum yield loss was observed in unprotected plots followed by treatments sprayed at 21 days interval. Combination of 66% and 100% T. asperellum concentration with 14 days interval resulted to higher yield and marginal rate of return compared to any other combination. Seed dipping was four times profitable than injection. The findings suggest that seed treatment at 66% and 100% T. asperellum concentration by dipping in combination with Ridomil® application at 14 days interval significantly reduced late blight epidemics and improved on yield and consequently increased net farm income.

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“…Over the past 20 years, periodic occurrences of potato late blight have been observed in Maine producing various levels of disease intensity (Lambert et al 1998;Groves 2002;Johnson 2005;Olanya et al 2002Olanya et al , 2005Olanya et al , 2006Olanya et al , 2009. In Maine, the NOBLIGHT model, a modification of BLITECAST (Krause et al 1975) is used for making recommendations for the initiation of fungicide applications for the control of late blight and for subsequent applications of fungicidal compounds in potato fields (Johnson 2006).…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of SIMBLIGHT1 and SIMPHYT1 models for predictingPhytophthora infestansin north-eastern United States

Olanya

Honeycutt

Tschöepe³

et al. 2012

Archives Of Phytopathology And Plant Protection

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Accurate prediction of Phytophthora infestans outbreak in a cropping season is crucial for the effective management of late blight on potato. The SIMBLIGHT1, SIMPHYT1 and modified SIMPHYT1 models were assessed for predicting late blight outbreaks relative to NOBLIGHT model by using climatic and crop data from field experiments at Presque Isle, ME, from 2004 to 2009. The dynamics of late blight infection pressures were computed by SIMPHYT3 model to assess the conduciveness of environmental conditions for late blight infection and potential for disease development. Infection pressure indicated conditions were moderately conducive for late blight development but varied across years. The SIMPHYT1 model recommended fungicide applications and 2009, respectively. The modified SIMPHYT1 model (US-version) recommended similar fungicide application dates for the same years with the exception of 2007. Model simulations of disease outbreak differed from actual recorded observations in untreated plots by 24-65 days. Simulation of SIMBLIGHT1 based on high and low soil moisture conditions in the field resulted in vast differences in dates of first fungicide application. Validation of the models (differences in the number of days between recommendation of fungicide treatment and late blight outbreak) indicated a better goodness of fit for the models (intervals of 6-20 days from the start of fungicide application to first disease outbreak). The NOBLIGHT model was accurate in forecasting the timing of first fungicide applications for late blight control. Significant improvements in late blight predictions could result if these models were modified to account for external sources of inoculum, by combining weather-based forecasts with spore traps, disease detection methods or complimentary systems.

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Assessment of the impact of mid-season late blight infection on disease development and yield of potato variety Russet Norkotah in Maine

Cited by 8 publications

References 10 publications

Effects of Mulch and Potato Hilling on Development of Foliar Blight (Phytophthora infestans) and the Control of Tuber Blight Infection

Effects of Mulch and Potato Hilling on Development of Foliar Blight (Phytophthora infestans) and the Control of Tuber Blight Infection

Cost Benefit Analyses in Managing Late Blight Through Trichoderma asperellum Seed Treatment and Ridomil® Application on Potato

Effectiveness of SIMBLIGHT1 and SIMPHYT1 models for predictingPhytophthora infestansin north-eastern United States

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