Epidemiology and population dynamics of Phytophthora infestans in Sub-Saharan Africa: Progress and constraints

Olanya, O. M.; Adipala, E.; Hakiza, J. J.; Kedera, J. C.; Ojiambo, Peter S.; Mukalazi, J.; Forbes, G. A.; Nelson, Ricky

doi:10.4314/acsj.v9i1.27638

Cited by 44 publications

(43 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the productivity has stagnated between 5 -7.5 t/ha at farmers level for many years while on-station yields go as high as 20 t/ha (FAOSTAT, 2014). This yield gap is attributed to pests and diseases (mainly late blight and bacterial wilt), low yielding varieties, poor disease management practices (Olanya et al, 2001), inadequate soil fertility management (Lemaga et al, 2001) and use of low quality seed potatoes (Byarugaba et al, 2017;Aheisibwe et al, 2015). With the rapid development of cell engineering, studies using suspension cells as starting plant material have gained momentum over the past several years.…”

Section: Introductionmentioning

confidence: 99%

In vitro somatic embryogenesis and regeneration potential of two potato varieties in Uganda

Byarugaba¹,

Magembe²,

Barekye³

et al. 2018

Afr. J. Biotechnol.

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

In vitro somatic embryogenesis and regeneration potential of two potato varieties in Uganda

Byarugaba¹,

Magembe²,

Barekye³

et al. 2018

Afr. J. Biotechnol.

View full text Add to dashboard Cite

show abstract

“…de Bary are estimated to be in excess of US$3.2 billion in developing countries (Anonymous 1998). In Kenya, potato production is concentrated in the densely populated highlands (1500-2500 m above sea level), and yield losses attributed to late blight range from 30 to 60% (Lung'aho et al 2006;Nyankanga et al 2004;Olanya et al 2001). Although resistant cultivars can be effective for late blight management, inadequate cultivar deployment and ineffective fungicide application strategies can often result in huge losses and financial catastrophe (Lung'aho et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Efficacy of fungicide mixtures for the management of Phytophthora infestans (US-1) on potato

Muchiri

Narla

Olanya

et al. 2010

phyto

View full text Add to dashboard Cite

Fungicide application strategies (timing, frequency, rates and mixtures) are important for the control and resistance management of potato late blight caused by Phytophthora infestans. The efficacy of fungicide mixtures consisting of fenamidone + mancozeb and propamocarb HCL + mancozeb at various rates and in spray regimes containing metalaxyl and mancozeb was evaluated for late blight control (US-1) at four locations in Kenya. Propamocarb HCL + mancozeb significantly (P < 0.05) reduced foliar blight compared with mancozeb and the untreated control under moderate to severe disease pressure. Disease severity was significantly lower following application of propamocarb HCL + mancozeb at a rate of 4L ha-1 than at rates of 2L and 3L ha-1 in 1999 and 2000, but it was not significantly lower following applications at a rate of 3L ha-1 in 2000 and 2001. There were no significant differences in mean final late blight score among the three rates of 0.9, 1.0 and 1.1 kg ha-1 of fenamidone + mancozeb. All fungicide mixtures and application sequences significantly reduced the area under the disease progress curve and final late blight scores as compared with the unprotected control. Total and marketable tuber yield significantly (P < 0.05) increased in all fungicide-treated plots.

show abstract

“…Late blight (causal agent Phytophthora infestans (Mont.) De Bary) is the most important potato disease in the tropical highlands of sub‐Saharan Africa, including Uganda (Bhagsari et al., 1994; Olanya et al., 2001). Yields from farmers' field are very low averaging 7 tonnes/ha compared with 35 tonnes per hectare in research stations (Low, 1997) partly because of late blight.…”

Section: Introductionmentioning

confidence: 99%

Effect of Integrating Planting Time, Fungicide Application and Host Resistance on Potato Late Blight Development in South‐western Uganda

Kankwatsa

Adipala

Hakiza³

et al. 2002

Journal of Phytopathology

Self Cite

View full text Add to dashboard Cite

The presence of inocula all year round poses a daunting challenge to the management of late blight [causal agent Phytophthora infestans (Mont.) De Bary] of Solanum potato in the highlands of eastern Africa. Commercial production depends heavily on use of fungicides and, to some extent, host resistance. In this study, integration of host resistance and fungicide application reduced late blight severity by more than 50% and resulted in yield gains of more than 30% when compared with the untreated control. The study demonstrated that susceptible varieties can be successfully grown in the region if well‐timed fungicide sprays are administered. Under high late blight pressure, fungicide application was necessary but integration of resistant cultivars in late blight management assisted in reducing the amount and frequency of fungicide applications. However, integration of timely planting (early planting) is difficult due to limitations in weather monitoring and the subsistence nature of the farming system in the eastern African highlands.

show abstract

Epidemiology and population dynamics of Phytophthora infestans in Sub-Saharan Africa: Progress and constraints

Cited by 44 publications

References 0 publications

In vitro somatic embryogenesis and regeneration potential of two potato varieties in Uganda

In vitro somatic embryogenesis and regeneration potential of two potato varieties in Uganda

Efficacy of fungicide mixtures for the management of Phytophthora infestans (US-1) on potato

Effect of Integrating Planting Time, Fungicide Application and Host Resistance on Potato Late Blight Development in South‐western Uganda

Contact Info

Product

Resources

About