Incidence and distribution of Sweetpotato viruses and their implication on sweetpotato seed system in Malawi

A survey was carried out in 19 districts to investigate the prevalence and distribution of sweetpotato virus disease (SPVD) and its implication on the sustainability of clean seed system in Malawi. A total of 166 leaf samples were collected and tested for the presence of 8 viruses using nitrocellulose membrane enzyme-linked immunosorbent assay (NCM-ELISA). SPVD foliar symptoms were observed in 68.42% of the surveyed districts. There were significant variations in disease incidence and severity (p < 0.001) among districts, with the highest incidence in Mulanje (28.34%). Average SPVD severity score was 3.05. NCM-ELISA detected sweet potato feathery mottle virus (SPFMV, 30.54%), sweet potato mild mottle virus (SPMMV, 31.14%), sweet potato mild speckling virus (SPMSV, 16.17%), sweet potato C-6 virus (SPC6V, 13.77%), sweet potato chlorotic stunt virus (SPCSV, 22.16%), sweet potato collusive virus (SPCV, 30.54%), sweet potato virus G (SPVG, 11.38%), cucumber mosaic virus (CMV, 7.78%) either in single or mixed infections. Data from this study indicate a significant SPVD occurrence in the country, and the consequence implications towards national sweetpotato seed system

CH92/082 and TME 6 cassava clones officially released for farmer growing in Malawi

Cassava clones CH92/082, TME 6 and BA95/070 were evaluated against Mbundumali, Phoso, Mulola and Sauti as checks. These clones were evaluated at Makoka, Mkondezi, Baka and Kasinthula Research Stations that represented different agro ecologies and in Mzuzu ADD under farmers' conditions. The objective of cassava improvement programme in Malawi is to develop cassava varieties that are: high yielding per unit area of land; tolerant to major diseases (cassava mosaic disease and cassava brown streak disease) and pests (cassava green mite and cassava mealy bug), adaptable to local environmental conditions and acceptable by end-users

Malawi potato variety catalogue 2021

This catalogue is the first for potato varieties registered in Malawi with the Agricultural Technology Clearing Committee (ATCC) of the Department of Agricultural Research Services (DARS) under the Ministry of Agriculture. The catalogue describes potato varieties in terms of use, tuber features, maturity period, yields, and resistance to diseases. A brief description of the growth characteristics has also been provided for each variety. Using the details provided, it is easy to identify each variety to target specific markets. This initiative is aimed at enhancing awareness about the released varieties and helping create the links between seed growers and potato farmers. This catalogue is, therefore, an important reference material for farmers and other market actors