Effect of fungicides on late blight control and yield loss of potato in the western highlands of Cameroon

Fontem, D. A.; Aighewi, Beatrice

doi:10.1080/09670879309371781

Cited by 20 publications

(12 citation statements)

References 4 publications

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“…Fungicides have shown grater efficacy compared to plant extracts due to their active ingredients which are often more potent for disease control compared to plant extracts. For example, successful fungicide controls for late blight and tuber yield have been documented in various studies (Fontem and Aighewi 1993;Ojiambo et al 2001;Namanda et al 2004). This has been attributed to fungicide protection of potato foliage, thereby increasing yield potential in treated plots compared to the untreated control plots.…”

Section: Discussionmentioning

confidence: 96%

Efficacy of fungicide combinations, phosphoric acid and plant extract from stinging nettle on potato late blight management and tuber yield

Nyankanga

Njogu

Muthomi

et al. 2012

Archives Of Phytopathology And Plant Protection

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Late blight caused by Phytophthora infestans is a major constraint to potato production. Inadequate control of the disease has often resulted in potato yield losses. We assessed the efficacy of fungicides, phosphoric acid and stinging nettle extract combinations for late blight control at two locations in Kenya. Disease severity, relative area under disease progress curves (RAUDPC), pathogen lesions and tuber yield were quantified during the 2008 and 2009 cropping cycles. The application of metalaxyl alternated with phosphate resulted in the greatest suppressive effects on late blight. The average late blight severity ranged from 3.5 to 34% in 2008 and 4.7 to 50% in 2009 at Tigoni location. RAUDPC for the same location ranged from 5 to 40% and 5 to 50% in 2008 and 2009, respectively. Similar levels of late blight severity were recorded at Marimba location in both years. Lesion growth and pathogen lesion numbers on potato plants differed significantly (p 5 0.05) among treatments. Fungicides, phosphoric acid and stinging nettle extract varied in late blight control. Potato tuber yield varied among treatments. Phosphoric acid treatment had significantly (p 5 0.05) greater tuber yield compared to metalaxyl at both locations. Field plots treated with plant extracts from stinging nettle resulted in the lowest tuber yield compared to other treatments with the exception of the untreated control. Fungicides, phosphoric acid, stinging nettle extract and their combinations can be readily effective in the suppression of late blight severity and pathogen lesions with moderate increases in tuber yield.

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Section: Discussionmentioning

confidence: 96%

Efficacy of fungicide combinations, phosphoric acid and plant extract from stinging nettle on potato late blight management and tuber yield

Nyankanga

Njogu

Muthomi

et al. 2012

Archives Of Phytopathology And Plant Protection

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“…The least significant difference test (LSD) at P=0.05 and 0.01 probabilities were used to separate significant treatment means, the P level depending on the F statistics. Percentage yield gain due to fungicide treatment was calculated for each cultivar as 100 × (fungicide sprayed plot yield – yield in control)/plot yield (Fontem and Aighew, 1993). To establish the profitability of each spray treatment, marginal rates of return were computed following CIMMYT (1987) procedures.…”

Section: Methodsmentioning

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

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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.

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“…Yield stability is crucially important for the economic viability of a farm. Unfavourable weather conditions, in particular frequent rainfall after potato tuber initiation, may cause heavy leaf infestation with late blight (P. infestans) potentially resulting in significant yield losses (Fontema and Aighew 1993;Roder et al 2008). In 1995, for example, a weather-induced epidemic outbreak of rice blast probably resulting from latent seed infections surprised many farmers in Bhutan leading to yield losses of up to 100 % (Thinlay et al 2000).…”

Section: Discussion and Outlookmentioning

confidence: 99%

Organic agriculture in Bhutan: potential and challenges

et al. 2014

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Effect of fungicides on late blight control and yield loss of potato in the western highlands of Cameroon

Cited by 20 publications

References 4 publications

Efficacy of fungicide combinations, phosphoric acid and plant extract from stinging nettle on potato late blight management and tuber yield

Efficacy of fungicide combinations, phosphoric acid and plant extract from stinging nettle on potato late blight management and tuber yield

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

Organic agriculture in Bhutan: potential and challenges

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