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Susceptibility of cassava varieties to disease caused by Sri Lankan cassava mosaic virus and impacts on yield by use of asymptomatic and virus-free planting material

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Title Susceptibility of cassava varieties to disease caused by Sri Lankan cassava mosaic virus and impacts on yield by use of asymptomatic and virus-free planting material
 
Creator Malik, Al Imran
Sophearith, Sok
Delaquis, Erik
Cuéllar, Wilmer Jose
Jiménez Polo, Jenyfer
Newby, Jonathan Craig
 
Subject plant viruses
yield factors
disease control
virus de las plantas
factores de rendimiento
control de enfermedades
 
Description Cassava (Manihot esculenta Crantz) is a rainfed, smallholder-produced crop in mainland Southeast Asia, and is currently facing a serious challenge posed by the introduction of cassava mosaic disease (CMD). This study assessed the susceptibility of popular Asian varieties to CMD, yield penalties associated with the disease, and the efficacy of selecting clean or asymptomatic plants as seed for the following season. Field experiments evaluated agronomic management practices (ie, fertilizer application, use of symptomatic and asymptomatic seed stakes) in Cambodia with six to nine popular varieties over three seasons under natural disease pressure. Popular cassava varieties KU50 and Huaybong60 showed superior CMD tolerance, with consistently fewer symptomatic plants, lower disease progress measures, and higher yields. Plants demonstrating symptoms at early stages of development, ie, 60 days after planting, yielded significantly less than those developing symptoms later (ie, 270 DAP) or not at all. Plants grown from clean stems yielded on average 20% to 2.7-fold higher than those grown from symptomatic planting material. A yield decline of~ 50% was recorded with symptomatic planting materials of susceptible varieties (eg, SC8,~ 25 t ha− 1) over successive years. The findings emphasize that farmers could use positive selection by choosing asymptomatic plants to significantly reduce yield losses.
 
Date 2022-07-12
2022-08-25T10:59:26Z
2022-08-25T10:59:26Z
 
Type Journal Article
 
Identifier Malik, A.I.; Sophearith, S.; Delaquis, E.; Cuellar, W.; Jimenez, J.; Newby, J. (2022) Susceptibility of cassava varieties to disease caused by Sri Lankan cassava mosaic virus and impacts on yield by use of asymptomatic and virus-free planting material. Agronomy 12(7): 1658. 18 p. ISSN: 2073-4395
2073-4395
https://hdl.handle.net/10568/120940
https://doi.org/10.3390/agronomy12071658
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format 18 p.
application/pdf
 
Publisher MDPI AG
 
Source Agronomy