Sweetpotato weevil (<i>Cylas</i>spp.) resistance in African sweetpotato germplasm

Muyinza, H.; Talwana, Herbert; Mwanga, R.O.M.; Stevenson, Philip C.

doi:10.1080/09670874.2012.655701

Cited by 37 publications

(56 citation statements)

References 9 publications

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“…Sustainable interventions should be identified to increase the number of seed multiplication gardens to generate enough certified seed to meet the demand gap. Somehow, these constraints are similar in other studies in Ethiopia [3], Ghana [9], Tanzania [12], and Kenya [20]. Lack of improved seed was mentioned as the major limiting factor to the expansion of sweet potato farms in an earlier study in Northern and Upper West Region [9].…”

Section: Production Constraintssupporting

confidence: 61%

“…The availability of good output markets will motivate growers to expand on production. Low yields due to the use of local landraces which are also susceptible to diseases and insect pests have been reported in Tanzania [12]. Access to quality seed especially during the critical period of planting was a critical problem in Kenya [20].…”

Section: Production Constraintsmentioning

confidence: 99%

“…Shortage of seed at planting time is still a chronic challenge across West Africa. During field production, a complex of biotic constraints, including nematodes, viral diseases, soil arthropods, weevils, and foliage feeding insects have been reported [12,13]. Overall, the African sweet potato weevils (Cylas brunneus F. and C. puncticollis Boheman) pose the most threat, followed by the sweet potato butterfly (Acraea acerata Hew.)…”

Section: Introductionmentioning

confidence: 99%

“…However, widespread production and utilization challenges such as low yields, use of local cultivars, poor access to vines, and field pests and diseases as well as postharvest storage, preservations, and utilization issues still exist [11][12][13][14]. Shortage of seed at planting time is still a chronic challenge across West Africa.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Sweet Potato Value Chain Analysis Reveals Opportunities for Increased Income and Food Security in Northern Ghana

Sugri

Maalekuu

Gaveh

et al. 2017

Advances in Agriculture

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Sweet potato has gained prominence due to its ability to adapt to wide production ecologies and yield response to minimal external inputs. Orange-fleshed cultivars in particular have immense potential to improve household income and nutrition in sub-Saharan Africa. However, the sweet potato value chain (SPVC) is not well-developed in many producing countries. The study was conducted in two regions to characterize the production operations as well as identify opportunities to propel the SPVC in Northern Ghana. Data were collected using mixed methods including structured questionnaires via face-to-face interviews. Analysis of strengths, weaknesses, opportunities, and threats (SWOT) was conducted at multistakeholder platforms with different actors. Gross margin profit and benefit-cost ratios were determined by using six cost variables. Overall, the industry was largely a fresh produce market, targeting food vendors, processors, and direct selling to wholesalers, retailers, and household consumers. The SWOT analysis revealed wide-ranging opportunities including favourable production ecologies, processing options, and insatiable local and international markets. The institutional actors need to network the primary actors to synergistically operate with a collective profit motive. The most prioritized production constraints such as access to seed, cost of chemical fertilizer, short shelf-life, field pests and diseases, and declining soil fertility should be addressed.

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Section: Production Constraintssupporting

confidence: 61%

Section: Production Constraintsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sweet Potato Value Chain Analysis Reveals Opportunities for Increased Income and Food Security in Northern Ghana

Sugri

Maalekuu

Gaveh

et al. 2017

Advances in Agriculture

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“…Sweet potato is the third most important crop in Sierra Leone after rice and cassava [3,4], and a staple food for a large proportion of the population in many parts of subSaharan Africa [5,6].…”

Section: Introductionmentioning

confidence: 99%

Sweet potato Weevil (Cylas puncticollis) Boheman Infestation: Cultivar Differences and the Effects of Mulching

Mansaray¹,

Sundufu²,

Moseray³

et al. 2015

TOENTOJ

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Abstract:The effects of infestation by the sweet potato weevil, Cylas puncticollis Bohemen, on yield in 3 sweet potato cultivars, in relation to different mulching levels were compared. The experiment was laid out in a randomized complete split plot design at three levels. It consisted of a main plot factor, the three sweet potato cultivars (slipot 2, 3 and 4) with mulching at three levels (0, 1, 3 and 5t/ha) as sub plot. The factors were replicated thrice. The results of the studies revealed that increase in mulching level resulted in significantly decreased infestation of sweet potato weevil and higher root yield. Mulching at the rate of 5t/ha recorded the least infestation (12.13% for the year 2012; 13.32% for the year 2013) followed by 3t/ha (17.86% for the year 2012; 21.24% for the year 2013), 1t/ha (25.18% for the year 2012; 29.49% for the year 2013) whilst the unmulched plot recorded the highest (35.75% for the year 2012; 41.30% for the year 2013). Root yield was the highest with mulching at the rate of 5t/ha (6242.42Kg/ha for the year 2012; 4828.45Kg/ha for the year 2013) followed by 3t/ha (5863.64Kg/ha for the year 2012; 4883.82Kg/ha for the year 2013), 1t/ha (4580.81Kg/ha for the year 2012; 3818.18Kg/ha for the year 2013) whilst the unmulched plot recorded the highest (4202.03Kg/ha for the year 2012; 3489.89Kg/ha for the year 2013). Significant negative correlation (r = -0.91, p = 0.0001) was observed between weevil root damage and root dry matter. Only two cultivars, Slipot 3 and Slipot 4 were observed to be less susceptible to the sweetpoto weevil. Thus, using mulch cover at the rate of 3-5t/ha in a field planted with slipot 3 or slipot 4 will increase yield, while at same time reduce sweet potato weevil infestation.

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Identification of the key morphological sweetpotato weevil resistance predictors in Ugandan sweetpotato genotypes using correlation and path‐coefficient analysis

et al. 2023

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Sweetpotato weevils (SPWs) can cause up to 100% yield losses in sweetpotato (Ipomoea batatas). Nevertheless, there has been limited success in breeding for SPW resistance globally. This is attributed partly to difficulty in screening for resistance because resistance to the SPW is complex and is mediated by several resistance indicators. Measuring all these resistance indicators is costly and time consuming. To enhance efficiency in selection for SPW resistance, there is need to profile and identify key resistance indicators. Potentially, this will better enable breeders to timely and precisely select for SPW resistance. The objective of this study was to identify the most efficient morphological resistance indicators against SPW. Thirty sweetpotato genotypes that varied in resistance to SPW comprising local collections, released varieties, and breeding lines were evaluated at three locations for two seasons in Uganda using an alpha lattice design. Data were collected on storage root yield, SPW root and stem damage, and weevil resistance indicators such as vine vigor (VV), ground cover (GC), vine weight (VW), storage root neck length (NL), latex content, cortex thickness (CT), and dry matter content (DM). Genotype means for all measured traits varied significantly except for CT. Negative relationships were observed between SPW root damage and GC, VW, CT, VV, NL, and DM. However, path coefficient analysis showed storage root NL (direct effect of −0.43, p < 0.001

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Sweetpotato weevil (Cylasspp.) resistance in African sweetpotato germplasm

Cited by 37 publications

References 9 publications

Sweet Potato Value Chain Analysis Reveals Opportunities for Increased Income and Food Security in Northern Ghana

Sweet Potato Value Chain Analysis Reveals Opportunities for Increased Income and Food Security in Northern Ghana

Sweet potato Weevil (Cylas puncticollis) Boheman Infestation: Cultivar Differences and the Effects of Mulching

Identification of the key morphological sweetpotato weevil resistance predictors in Ugandan sweetpotato genotypes using correlation and path‐coefficient analysis

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