First report of the East African cassava mosaic virus-Uganda (EACMV-UG) infecting cassava (Manihot esculenta) in Cameroon.

Publication Date

Tue, 23 Aug 2011, 00:00

Last Updated

Aug. 22, 2011, 9:01 a.m.

Report Number

CMR-02/3

Country

Cameroon

Pest Id

East African cassava mosaic virus - (EACMV0)

Report Status

Final

Hosts

Cassava (Manihot esculenta).

Pest Status (old values from ISPM 8 -1998 )

• Present: only in some areas

Pest Status (ISPM 8 - 2021)

• Present: not widely distributed and under official control

Geographical Distribution

East African cassava mosaic virus-Uganda (EACMV-UG)was detected in samples from cassava fields in Kadey, Boumba-and-Ngoko, Lom-and-Djerem and Mbere divisions in the Eastern region of Cameroon.

Summary

surveys were conducted for EACMV-Uganda (EACMV-UG), a recombinant virus responsible for severe CMD epidemics in East and Central Africa,which occurs in adjoining Republic of Congo (RC) and Gabon (Legg et al., 2004). Surveys were conducted during March to November 2009 in 156 fields in 37 administrative divisions in Cameroon. Six to eight samples from each field were collected from plants with distinct symptoms and severity,and analysed with the polymerase chain reaction (PCR) using primers. East African cassava mosaic virus-Uganda (EACMV-UG)was detected in samples from cassava fields in Kadey, Boumba-and-Ngoko, Lom-and-Djerem and Mbere divisions in the Eastern region of Cameroon.Incidence in fields ranged from 11.1% (Mbotoro) to 83.3% (Boyere). Urgent phytosanitary measures are required to prevent the spread of this disease.

Danger

This is the first report of EACMV-UG in Cameroon. Its occurrence in areas bordering EACMV-UG affected countries suggests the spread of the virus by white flies or infected cuttings. Urgent deployment of resistant varieties in the affected regions is necessary to prevent severe CMD epidemics and further spread of this virus into West Africa.

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