Association of Aphis craccivora with the spread of peanut stunt virus in alfalfa fields in the Sudan.
Epidemiological studies on groundnut stunt virus in Khartoum Province were carried out in 5 lucerne fields, Dec. 1982-Apr. 1983. The virus was widespread and readily transmissible by Aphis craccivora, the predominant aphid sp. The continuous presence of the virus on lucerne, together with the abundance of vectors, posed a threat to other legumes grown in the vicinity. It is recommended that lucerne fields be isolated from fields in which other legumes are cultivated. Alternatively, pesticide application could be an effective control measure, provided that it is timed to coincide with the aphid build-up after lucerne cutting. Lucerne cultivation should not be introduced into the main groundnut-growing areas of the Sudan.